/usr/lib/x86_64-linux-gnu/glusterfs/python/syncdaemon/master.py is in glusterfs-common 3.8.8-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 | #
# Copyright (c) 2011-2014 Red Hat, Inc. <http://www.redhat.com>
# This file is part of GlusterFS.
# This file is licensed to you under your choice of the GNU Lesser
# General Public License, version 3 or any later version (LGPLv3 or
# later), or the GNU General Public License, version 2 (GPLv2), in all
# cases as published by the Free Software Foundation.
#
import os
import sys
import time
import stat
import json
import logging
import fcntl
import string
import errno
import tarfile
from errno import ENOENT, ENODATA, EEXIST, EACCES, EAGAIN, ESTALE
from threading import Condition, Lock
from datetime import datetime
from gconf import gconf
from syncdutils import Thread, GsyncdError, boolify, escape
from syncdutils import unescape, gauxpfx, md5hex, selfkill
from syncdutils import lstat, errno_wrap, FreeObject
from syncdutils import NoPurgeTimeAvailable, PartialHistoryAvailable
URXTIME = (-1, 0)
# Default rollover time set in changelog translator
# changelog rollover time is hardcoded here to avoid the
# xsync usage when crawling switch happens from history
# to changelog. If rollover time increased in translator
# then geo-rep can enter into xsync crawl after history
# crawl before starting live changelog crawl.
CHANGELOG_ROLLOVER_TIME = 15
# Max size of Changelogs to process per batch, Changelogs Processing is
# not limited by the number of changelogs but instead based on
# size of the changelog file, One sample changelog file size was 145408
# with ~1000 CREATE and ~1000 DATA. 5 such files in one batch is 727040
# If geo-rep worker crashes while processing a batch, it has to retry only
# that batch since stime will get updated after each batch.
MAX_CHANGELOG_BATCH_SIZE = 727040
# Utility functions to help us to get to closer proximity
# of the DRY principle (no, don't look for elevated or
# perspectivistic things here)
def _xtime_now():
t = time.time()
sec = int(t)
nsec = int((t - sec) * 1000000)
return (sec, nsec)
def _volinfo_hook_relax_foreign(self):
volinfo_sys = self.get_sys_volinfo()
fgn_vi = volinfo_sys[self.KFGN]
if fgn_vi:
expiry = fgn_vi['timeout'] - int(time.time()) + 1
logging.info('foreign volume info found, waiting %d sec for expiry' %
expiry)
time.sleep(expiry)
volinfo_sys = self.get_sys_volinfo()
return volinfo_sys
# The API!
def gmaster_builder(excrawl=None):
"""produce the GMaster class variant corresponding
to sync mode"""
this = sys.modules[__name__]
modemixin = gconf.special_sync_mode
if not modemixin:
modemixin = 'normal'
changemixin = 'xsync' if gconf.change_detector == 'xsync' \
else excrawl or gconf.change_detector
logging.info('setting up %s change detection mode' % changemixin)
modemixin = getattr(this, modemixin.capitalize() + 'Mixin')
crawlmixin = getattr(this, 'GMaster' + changemixin.capitalize() + 'Mixin')
sendmarkmixin = boolify(
gconf.use_rsync_xattrs) and SendmarkRsyncMixin or SendmarkNormalMixin
purgemixin = boolify(
gconf.ignore_deletes) and PurgeNoopMixin or PurgeNormalMixin
syncengine = boolify(gconf.use_tarssh) and TarSSHEngine or RsyncEngine
class _GMaster(crawlmixin, modemixin, sendmarkmixin,
purgemixin, syncengine):
pass
return _GMaster
# Mixin classes that implement the data format
# and logic particularities of the certain
# sync modes
class NormalMixin(object):
"""normal geo-rep behavior"""
minus_infinity = URXTIME
# following staticmethods ideally would be
# methods of an xtime object (in particular,
# implementing the hooks needed for comparison
# operators), but at this point we don't yet
# have a dedicated xtime class
@staticmethod
def serialize_xtime(xt):
return "%d.%d" % tuple(xt)
@staticmethod
def deserialize_xtime(xt):
return tuple(int(x) for x in xt.split("."))
@staticmethod
def native_xtime(xt):
return xt
@staticmethod
def xtime_geq(xt0, xt1):
return xt0 >= xt1
def make_xtime_opts(self, is_master, opts):
if not 'create' in opts:
opts['create'] = is_master
if not 'default_xtime' in opts:
opts['default_xtime'] = URXTIME
def xtime_low(self, rsc, path, **opts):
if rsc == self.master:
xt = rsc.server.xtime(path, self.uuid)
else:
xt = rsc.server.stime(path, self.uuid)
if isinstance(xt, int) and xt == ENODATA:
xt = rsc.server.xtime(path, self.uuid)
if not isinstance(xt, int):
self.slave.server.set_stime(path, self.uuid, xt)
if isinstance(xt, int) and xt != ENODATA:
return xt
if xt == ENODATA or xt < self.volmark:
if opts['create']:
xt = _xtime_now()
rsc.server.aggregated.set_xtime(path, self.uuid, xt)
else:
xt = opts['default_xtime']
return xt
def keepalive_payload_hook(self, timo, gap):
# first grab a reference as self.volinfo
# can be changed in main thread
vi = self.volinfo
if vi:
# then have a private copy which we can mod
vi = vi.copy()
vi['timeout'] = int(time.time()) + timo
else:
# send keep-alives more frequently to
# avoid a delay in announcing our volume info
# to slave if it becomes established in the
# meantime
gap = min(10, gap)
return (vi, gap)
def volinfo_hook(self):
return self.get_sys_volinfo()
def xtime_reversion_hook(self, path, xtl, xtr):
if xtr > xtl:
raise GsyncdError("timestamp corruption for " + path)
def need_sync(self, e, xte, xtrd):
return xte > xtrd
def set_slave_xtime(self, path, mark):
self.slave.server.set_stime(path, self.uuid, mark)
# self.slave.server.set_xtime_remote(path, self.uuid, mark)
class PartialMixin(NormalMixin):
"""a variant tuned towards operation with a master
that has partial info of the slave (brick typically)"""
def xtime_reversion_hook(self, path, xtl, xtr):
pass
class RecoverMixin(NormalMixin):
"""a variant that differs from normal in terms
of ignoring non-indexed files"""
@staticmethod
def make_xtime_opts(is_master, opts):
if not 'create' in opts:
opts['create'] = False
if not 'default_xtime' in opts:
opts['default_xtime'] = URXTIME
def keepalive_payload_hook(self, timo, gap):
return (None, gap)
def volinfo_hook(self):
return _volinfo_hook_relax_foreign(self)
# Further mixins for certain tunable behaviors
class SendmarkNormalMixin(object):
def sendmark_regular(self, *a, **kw):
return self.sendmark(*a, **kw)
class SendmarkRsyncMixin(object):
def sendmark_regular(self, *a, **kw):
pass
class PurgeNormalMixin(object):
def purge_missing(self, path, names):
self.slave.server.purge(path, names)
class PurgeNoopMixin(object):
def purge_missing(self, path, names):
pass
class TarSSHEngine(object):
"""Sync engine that uses tar(1) piped over ssh(1)
for data transfers. Good for lots of small files.
"""
def a_syncdata(self, files):
logging.debug('files: %s' % (files))
for f in files:
pb = self.syncer.add(f)
def regjob(se, xte, pb):
rv = pb.wait()
if rv[0]:
logging.debug('synced ' + se)
return True
else:
# stat check for file presence
st = lstat(se)
if isinstance(st, int):
# file got unlinked in the interim
self.unlinked_gfids.add(se)
return True
self.add_job(self.FLAT_DIR_HIERARCHY, 'reg', regjob, f, None, pb)
def syncdata_wait(self):
if self.wait(self.FLAT_DIR_HIERARCHY, None):
return True
def syncdata(self, files):
self.a_syncdata(files)
self.syncdata_wait()
class RsyncEngine(object):
"""Sync engine that uses rsync(1) for data transfers"""
def a_syncdata(self, files):
logging.debug('files: %s' % (files))
for f in files:
logging.debug('candidate for syncing %s' % f)
pb = self.syncer.add(f)
def regjob(se, xte, pb):
rv = pb.wait()
if rv[0]:
logging.debug('synced ' + se)
return True
else:
# stat to check if the file exist
st = lstat(se)
if isinstance(st, int):
# file got unlinked in the interim
self.unlinked_gfids.add(se)
return True
self.add_job(self.FLAT_DIR_HIERARCHY, 'reg', regjob, f, None, pb)
def syncdata_wait(self):
if self.wait(self.FLAT_DIR_HIERARCHY, None):
return True
def syncdata(self, files):
self.a_syncdata(files)
self.syncdata_wait()
class GMasterCommon(object):
"""abstract class impementling master role"""
KFGN = 0
KNAT = 1
def get_sys_volinfo(self):
"""query volume marks on fs root
err out on multiple foreign masters
"""
fgn_vis, nat_vi = (
self.master.server.aggregated.foreign_volume_infos(),
self.master.server.aggregated.native_volume_info())
fgn_vi = None
if fgn_vis:
if len(fgn_vis) > 1:
raise GsyncdError("cannot work with multiple foreign masters")
fgn_vi = fgn_vis[0]
return fgn_vi, nat_vi
@property
def uuid(self):
if self.volinfo:
return self.volinfo['uuid']
@property
def volmark(self):
if self.volinfo:
return self.volinfo['volume_mark']
def xtime(self, path, *a, **opts):
"""get amended xtime
as of amending, we can create missing xtime, or
determine a valid value if what we get is expired
(as of the volume mark expiry); way of amendig
depends on @opts and on subject of query (master
or slave).
"""
if a:
rsc = a[0]
else:
rsc = self.master
self.make_xtime_opts(rsc == self.master, opts)
return self.xtime_low(rsc, path, **opts)
def __init__(self, master, slave):
self.master = master
self.slave = slave
self.jobtab = {}
if boolify(gconf.use_tarssh):
logging.info("using 'tar over ssh' as the sync engine")
self.syncer = Syncer(slave, self.slave.tarssh, [2])
else:
logging.info("using 'rsync' as the sync engine")
# partial transfer (cf. rsync(1)), that's normal
self.syncer = Syncer(slave, self.slave.rsync, [23, 24])
# crawls vs. turns:
# - self.crawls is simply the number of crawl() invocations on root
# - one turn is a maximal consecutive sequence of crawls so that each
# crawl in it detects a change to be synced
# - self.turns is the number of turns since start
# - self.total_turns is a limit so that if self.turns reaches it, then
# we exit (for diagnostic purposes)
# so, eg., if the master fs changes unceasingly, self.turns will remain
# 0.
self.crawls = 0
self.turns = 0
self.total_turns = int(gconf.turns)
self.crawl_start = datetime.now()
self.lastreport = {'crawls': 0, 'turns': 0, 'time': 0}
self.start = None
self.change_seen = None
# the actual volinfo we make use of
self.volinfo = None
self.terminate = False
self.sleep_interval = 1
self.unlinked_gfids = set()
def init_keep_alive(cls):
"""start the keep-alive thread """
timo = int(gconf.timeout or 0)
if timo > 0:
def keep_alive():
while True:
vi, gap = cls.keepalive_payload_hook(timo, timo * 0.5)
cls.slave.server.keep_alive(vi)
time.sleep(gap)
t = Thread(target=keep_alive)
t.start()
def mgmt_lock(self):
"""Take management volume lock """
if gconf.mgmt_lock_fd:
try:
fcntl.lockf(gconf.mgmt_lock_fd, fcntl.LOCK_EX | fcntl.LOCK_NB)
if not gconf.active_earlier:
gconf.active_earlier = True
logging.info("Got lock : %s : Becoming ACTIVE"
% gconf.local_path)
return True
except:
ex = sys.exc_info()[1]
if isinstance(ex, IOError) and ex.errno in (EACCES, EAGAIN):
if not gconf.passive_earlier:
gconf.passive_earlier = True
logging.info("Didn't get lock : %s : Becoming PASSIVE"
% gconf.local_path)
return False
raise
fd = None
bname = str(self.uuid) + "_" + str(gconf.slave_id) + "_subvol_" \
+ str(gconf.subvol_num) + ".lock"
mgmt_lock_dir = os.path.join(gconf.meta_volume_mnt, "geo-rep")
path = os.path.join(mgmt_lock_dir, bname)
logging.debug("lock_file_path: %s" % path)
try:
fd = os.open(path, os.O_CREAT | os.O_RDWR)
except OSError:
ex = sys.exc_info()[1]
if ex.errno == ENOENT:
logging.info("Creating geo-rep directory in meta volume...")
try:
os.makedirs(mgmt_lock_dir)
except OSError:
ex = sys.exc_info()[1]
if ex.errno == EEXIST:
pass
else:
raise
fd = os.open(path, os.O_CREAT | os.O_RDWR)
else:
raise
try:
fcntl.lockf(fd, fcntl.LOCK_EX | fcntl.LOCK_NB)
# Save latest FD for future use
gconf.mgmt_lock_fd = fd
except:
ex = sys.exc_info()[1]
if isinstance(ex, IOError) and ex.errno in (EACCES, EAGAIN):
# cannot grab, it's taken
if not gconf.passive_earlier:
gconf.passive_earlier = True
logging.info("Didn't get lock : %s : Becoming PASSIVE"
% gconf.local_path)
gconf.mgmt_lock_fd = fd
return False
raise
if not gconf.active_earlier:
gconf.active_earlier = True
logging.info("Got lock : %s : Becoming ACTIVE" % gconf.local_path)
return True
def should_crawl(self):
if not boolify(gconf.use_meta_volume):
return gconf.glusterd_uuid in self.master.server.node_uuid()
if not os.path.ismount(gconf.meta_volume_mnt):
logging.error("Meta-volume is not mounted. Worker Exiting...")
sys.exit(1)
return self.mgmt_lock()
def register(self):
self.register()
def crawlwrap(self, oneshot=False, register_time=None):
if oneshot:
# it's important to do this during the oneshot crawl as
# for a passive gsyncd (ie. in a replicate scenario)
# the keepalive thread would keep the connection alive.
self.init_keep_alive()
# If crawlwrap is called when partial history available,
# then it sets register_time which is the time when geo-rep
# worker registerd to changelog consumption. Since nsec is
# not considered in register time, their are chances of skipping
# changes detection in xsync crawl. This limit will be reset when
# crawlwrap is called again.
self.live_changelog_start_time = None
if register_time:
self.live_changelog_start_time = (register_time, 0)
# no need to maintain volinfo state machine.
# in a cascading setup, each geo-replication session is
# independent (ie. 'volume-mark' and 'xtime' are not
# propogated). This is because the slave's xtime is now
# stored on the master itself. 'volume-mark' just identifies
# that we are in a cascading setup and need to enable
# 'geo-replication.ignore-pid-check' option.
volinfo_sys = self.volinfo_hook()
self.volinfo = volinfo_sys[self.KNAT]
inter_master = volinfo_sys[self.KFGN]
logging.info("%s master with volume id %s ..." %
(inter_master and "intermediate" or "primary",
self.uuid))
gconf.configinterface.set('volume_id', self.uuid)
if self.volinfo:
if self.volinfo['retval']:
logging.warn("master cluster's info may not be valid %d" %
self.volinfo['retval'])
else:
raise GsyncdError("master volinfo unavailable")
self.lastreport['time'] = time.time()
logging.info('crawl interval: %d seconds' % self.sleep_interval)
t0 = time.time()
crawl = self.should_crawl()
while not self.terminate:
if self.start:
logging.debug("... crawl #%d done, took %.6f seconds" %
(self.crawls, time.time() - self.start))
self.start = time.time()
should_display_info = self.start - self.lastreport['time'] >= 60
if should_display_info:
logging.info("%d crawls, %d turns",
self.crawls - self.lastreport['crawls'],
self.turns - self.lastreport['turns'])
self.lastreport.update(crawls=self.crawls,
turns=self.turns,
time=self.start)
t1 = time.time()
if int(t1 - t0) >= int(gconf.replica_failover_interval):
crawl = self.should_crawl()
t0 = t1
self.update_worker_remote_node()
if not crawl:
self.status.set_passive()
# bring up _this_ brick to the cluster stime
# which is min of cluster (but max of the replicas)
brick_stime = self.xtime('.', self.slave)
cluster_stime = self.master.server.aggregated.stime_mnt(
'.', '.'.join([str(self.uuid), str(gconf.slave_id)]))
logging.debug("Cluster stime: %s | Brick stime: %s" %
(repr(cluster_stime), repr(brick_stime)))
if not isinstance(cluster_stime, int):
if brick_stime < cluster_stime:
self.slave.server.set_stime(
self.FLAT_DIR_HIERARCHY, self.uuid, cluster_stime)
# Purge all changelogs available in processing dir
# less than cluster_stime
proc_dir = os.path.join(self.setup_working_dir(),
".processing")
if os.path.exists(proc_dir):
to_purge = [f for f in os.listdir(proc_dir)
if (f.startswith("CHANGELOG.") and
int(f.split('.')[-1]) <
cluster_stime[0])]
for f in to_purge:
os.remove(os.path.join(proc_dir, f))
time.sleep(5)
continue
self.status.set_active()
self.crawl()
if oneshot:
return
time.sleep(self.sleep_interval)
@staticmethod
def humantime(*tpair):
"""format xtime-like (sec, nsec) pair to human readable format"""
ts = datetime.fromtimestamp(float('.'.join(str(n) for n in tpair))).\
strftime("%Y-%m-%d %H:%M:%S")
if len(tpair) > 1:
ts += '.' + str(tpair[1])
return ts
def _crawl_time_format(self, crawl_time):
# Ex: 5 years, 4 days, 20:23:10
years, days = divmod(crawl_time.days, 365.25)
years = int(years)
days = int(days)
date = ""
m, s = divmod(crawl_time.seconds, 60)
h, m = divmod(m, 60)
if years != 0:
date += "%s %s " % (years, "year" if years == 1 else "years")
if days != 0:
date += "%s %s " % (days, "day" if days == 1 else "days")
date += "%s:%s:%s" % (string.zfill(h, 2),
string.zfill(m, 2), string.zfill(s, 2))
return date
def add_job(self, path, label, job, *a, **kw):
"""insert @job function to job table at @path with @label"""
if self.jobtab.get(path) is None:
self.jobtab[path] = []
self.jobtab[path].append((label, a, lambda: job(*a, **kw)))
def add_failjob(self, path, label):
"""invoke .add_job with a job that does nothing just fails"""
logging.debug('salvaged: ' + label)
self.add_job(path, label, lambda: False)
def wait(self, path, *args):
"""perform jobs registered for @path
Reset jobtab entry for @path,
determine success as the conjunction of
success of all the jobs. In case of
success, call .sendmark on @path
"""
jobs = self.jobtab.pop(path, [])
succeed = True
for j in jobs:
ret = j[-1]()
if not ret:
succeed = False
if succeed and not args[0] is None:
self.sendmark(path, *args)
return succeed
def sendmark(self, path, mark, adct=None):
"""update slave side xtime for @path to master side xtime
also can send a setattr payload (see Server.setattr).
"""
if adct:
self.slave.server.setattr(path, adct)
self.set_slave_xtime(path, mark)
class XCrawlMetadata(object):
def __init__(self, st_uid, st_gid, st_mode, st_atime, st_mtime):
self.st_uid = int(st_uid)
self.st_gid = int(st_gid)
self.st_mode = int(st_mode)
self.st_atime = float(st_atime)
self.st_mtime = float(st_mtime)
class GMasterChangelogMixin(GMasterCommon):
""" changelog based change detection and syncing """
# index for change type and entry
IDX_START = 0
IDX_END = 2
UNLINK_ENTRY = 2
POS_GFID = 0
POS_TYPE = 1
POS_ENTRY1 = -1
TYPE_META = "M "
TYPE_GFID = "D "
TYPE_ENTRY = "E "
# flat directory hierarchy for gfid based access
FLAT_DIR_HIERARCHY = '.'
# maximum retries per changelog before giving up
MAX_RETRIES = 10
CHANGELOG_CONN_RETRIES = 5
def archive_and_purge_changelogs(self, changelogs):
# Creates tar file instead of tar.gz, since changelogs will
# be appended to existing tar. archive name is
# archive_<YEAR><MONTH>.tar
archive_name = "archive_%s.tar" % datetime.today().strftime(
gconf.changelog_archive_format)
try:
tar = tarfile.open(os.path.join(self.processed_changelogs_dir,
archive_name),
"a")
except tarfile.ReadError:
tar = tarfile.open(os.path.join(self.processed_changelogs_dir,
archive_name),
"w")
for f in changelogs:
try:
f = os.path.basename(f)
tar.add(os.path.join(self.processed_changelogs_dir, f),
arcname=os.path.basename(f))
except:
exc = sys.exc_info()[1]
if ((isinstance(exc, OSError) or
isinstance(exc, IOError)) and exc.errno == ENOENT):
continue
else:
tar.close()
raise
tar.close()
for f in changelogs:
try:
f = os.path.basename(f)
os.remove(os.path.join(self.processed_changelogs_dir, f))
except OSError as e:
if e.errno == errno.ENOENT:
continue
else:
raise
def fallback_xsync(self):
logging.info('falling back to xsync mode')
gconf.configinterface.set('change-detector', 'xsync')
selfkill()
def setup_working_dir(self):
workdir = os.path.join(gconf.working_dir, md5hex(gconf.local_path))
logging.debug('changelog working dir %s' % workdir)
return workdir
def get_purge_time(self):
purge_time = self.xtime('.', self.slave)
if isinstance(purge_time, int):
purge_time = None
return purge_time
def process_change(self, change, done, retry):
pfx = gauxpfx()
clist = []
entries = []
meta_gfid = set()
datas = set()
# basic crawl stats: files and bytes
files_pending = {'count': 0, 'purge': 0, 'bytes': 0, 'files': []}
try:
f = open(change, "r")
clist = f.readlines()
f.close()
except IOError:
raise
def edct(op, **ed):
dct = {}
dct['op'] = op
for k in ed:
if k == 'stat':
st = ed[k]
dst = dct['stat'] = {}
if st:
dst['uid'] = st.st_uid
dst['gid'] = st.st_gid
dst['mode'] = st.st_mode
dst['atime'] = st.st_atime
dst['mtime'] = st.st_mtime
else:
dct[k] = ed[k]
return dct
# entry counts (not purges)
def entry_update():
files_pending['count'] += 1
# purge count
def purge_update():
files_pending['purge'] += 1
def log_failures(failures, entry_key, gfid_prefix, log_prefix):
num_failures = 0
for failure in failures:
st = lstat(os.path.join(gfid_prefix, failure[0][entry_key]))
if not isinstance(st, int):
num_failures += 1
logging.error('%s FAILED: %s' % (log_prefix,
repr(failure)))
self.status.inc_value("failures", num_failures)
for e in clist:
e = e.strip()
et = e[self.IDX_START:self.IDX_END] # entry type
ec = e[self.IDX_END:].split(' ') # rest of the bits
# skip ENTRY operation if hot tier brick
if self.name == 'live_changelog' or \
self.name == 'history_changelog':
if boolify(gconf.is_hottier) and et == self.TYPE_ENTRY:
logging.debug('skip ENTRY op: %s if hot tier brick'
% (ec[self.POS_TYPE]))
continue
if et == self.TYPE_ENTRY:
# extract information according to the type of
# the entry operation. create(), mkdir() and mknod()
# have mode, uid, gid information in the changelog
# itself, so no need to stat()...
ty = ec[self.POS_TYPE]
# PARGFID/BNAME
en = unescape(os.path.join(pfx, ec[self.POS_ENTRY1]))
# GFID of the entry
gfid = ec[self.POS_GFID]
if ty in ['UNLINK', 'RMDIR']:
# The index of PARGFID/BNAME for UNLINK, RMDIR
# is no more the last index. It varies based on
# changelog.capture-del-path is enabled or not.
en = unescape(os.path.join(pfx, ec[self.UNLINK_ENTRY]))
# Remove from DATA list, so that rsync will
# not fail
pt = os.path.join(pfx, ec[0])
if pt in datas:
datas.remove(pt)
if not boolify(gconf.ignore_deletes):
purge_update()
entries.append(edct(ty, gfid=gfid, entry=en))
elif ty in ['CREATE', 'MKDIR', 'MKNOD']:
entry_update()
# Special case: record mknod as link
if ty in ['MKNOD']:
mode = int(ec[2])
if mode & 01000:
# Avoid stat'ing the file as it
# may be deleted in the interim
st = FreeObject(st_mode=int(ec[2]),
st_uid=int(ec[3]),
st_gid=int(ec[4]),
st_atime=0,
st_mtime=0)
# So, it may be deleted, but still we are
# append LINK? Because, the file will be
# CREATED if source not exists.
entries.append(edct('LINK', stat=st, entry=en,
gfid=gfid))
# Here, we have the assumption that only
# tier-gfid.linkto causes this mknod. Add data
datas.add(os.path.join(pfx, ec[0]))
continue
# stat info. present in the changelog itself
entries.append(edct(ty, gfid=gfid, entry=en,
mode=int(ec[2]),
uid=int(ec[3]), gid=int(ec[4])))
elif ty == "RENAME":
go = os.path.join(pfx, gfid)
st = lstat(go)
if isinstance(st, int):
st = {}
rl = None
if st and stat.S_ISLNK(st.st_mode):
rl = errno_wrap(os.readlink, [en], [ENOENT], [ESTALE])
if isinstance(rl, int):
rl = None
entry_update()
e1 = unescape(os.path.join(pfx, ec[self.POS_ENTRY1 - 1]))
entries.append(edct(ty, gfid=gfid, entry=e1, entry1=en,
stat=st, link=rl))
else:
# stat() to get mode and other information
go = os.path.join(pfx, gfid)
st = lstat(go)
if isinstance(st, int):
logging.debug('file %s got purged in the interim' % go)
continue
if ty == 'LINK':
entry_update()
entries.append(edct(ty, stat=st, entry=en, gfid=gfid))
elif ty == 'SYMLINK':
rl = errno_wrap(os.readlink, [en], [ENOENT], [ESTALE])
if isinstance(rl, int):
continue
entry_update()
entries.append(
edct(ty, stat=st, entry=en, gfid=gfid, link=rl))
else:
logging.warn('ignoring %s [op %s]' % (gfid, ty))
elif et == self.TYPE_GFID:
# If self.unlinked_gfids is available, then that means it is
# retrying the changelog second time. Do not add the GFID's
# to rsync job if failed previously but unlinked in master
if self.unlinked_gfids and \
os.path.join(pfx, ec[0]) in self.unlinked_gfids:
logging.debug("ignoring data, since file purged interim")
else:
datas.add(os.path.join(pfx, ec[0]))
elif et == self.TYPE_META:
if ec[1] == 'SETATTR': # only setattr's for now...
if len(ec) == 5:
# In xsync crawl, we already have stat data
# avoid doing stat again
meta_gfid.add((os.path.join(pfx, ec[0]),
XCrawlMetadata(st_uid=ec[2],
st_gid=ec[3],
st_mode=ec[4],
st_atime=ec[5],
st_mtime=ec[6])))
else:
meta_gfid.add((os.path.join(pfx, ec[0]), ))
elif ec[1] == 'SETXATTR' or ec[1] == 'XATTROP' or \
ec[1] == 'FXATTROP':
# To sync xattr/acls use rsync/tar, --xattrs and --acls
# switch to rsync and tar
if not boolify(gconf.use_tarssh) and \
(boolify(gconf.sync_xattrs) or boolify(gconf.sync_acls)):
datas.add(os.path.join(pfx, ec[0]))
else:
logging.warn('got invalid changelog type: %s' % (et))
logging.debug('entries: %s' % repr(entries))
# Increment counters for Status
self.status.inc_value("entry", len(entries))
self.files_in_batch += len(datas)
self.status.inc_value("data", len(datas))
# sync namespace
if entries:
failures = self.slave.server.entry_ops(entries)
log_failures(failures, 'gfid', gauxpfx(), 'ENTRY')
self.status.dec_value("entry", len(entries))
# sync metadata
if meta_gfid:
meta_entries = []
for go in meta_gfid:
if len(go) > 1:
st = go[1]
else:
st = lstat(go[0])
if isinstance(st, int):
logging.debug('file %s got purged in the interim' % go[0])
continue
meta_entries.append(edct('META', go=go[0], stat=st))
if meta_entries:
self.status.inc_value("meta", len(entries))
failures = self.slave.server.meta_ops(meta_entries)
log_failures(failures, 'go', '', 'META')
self.status.dec_value("meta", len(entries))
# sync data
if datas:
self.a_syncdata(datas)
self.datas_in_batch.update(datas)
def process(self, changes, done=1):
tries = 0
retry = False
self.unlinked_gfids = set()
self.files_in_batch = 0
self.datas_in_batch = set()
self.syncer.disable_errorlog()
while True:
# first, fire all changelog transfers in parallel. entry and
# metadata are performed synchronously, therefore in serial.
# However at the end of each changelog, data is synchronized
# with syncdata_async() - which means it is serial w.r.t
# entries/metadata of that changelog but happens in parallel
# with data of other changelogs.
if retry:
if tries == (self.MAX_RETRIES - 1):
# Enable Error logging if it is last retry
self.syncer.enable_errorlog()
# Remove Unlinked GFIDs from Queue
for unlinked_gfid in self.unlinked_gfids:
if unlinked_gfid in self.datas_in_batch:
self.datas_in_batch.remove(unlinked_gfid)
# Retry only Sync. Do not retry entry ops
if self.datas_in_batch:
self.a_syncdata(self.datas_in_batch)
else:
for change in changes:
logging.debug('processing change %s' % change)
self.process_change(change, done, retry)
if not retry:
# number of changelogs processed in the batch
self.turns += 1
# Now we wait for all the data transfers fired off in the above
# step to complete. Note that this is not ideal either. Ideally
# we want to trigger the entry/meta-data transfer of the next
# batch while waiting for the data transfer of the current batch
# to finish.
# Note that the reason to wait for the data transfer (vs doing it
# completely in the background and call the changelog_done()
# asynchronously) is because this waiting acts as a "backpressure"
# and prevents a spiraling increase of wait stubs from consuming
# unbounded memory and resources.
# update the slave's time with the timestamp of the _last_
# changelog file time suffix. Since, the changelog prefix time
# is the time when the changelog was rolled over, introduce a
# tolerance of 1 second to counter the small delta b/w the
# marker update and gettimeofday().
# NOTE: this is only for changelog mode, not xsync.
# @change is the last changelog (therefore max time for this batch)
if self.syncdata_wait():
self.unlinked_gfids = set()
if done:
xtl = (int(change.split('.')[-1]) - 1, 0)
self.upd_stime(xtl)
map(self.changelog_done_func, changes)
self.archive_and_purge_changelogs(changes)
# Reset Data counter after sync
self.status.dec_value("data", self.files_in_batch)
self.files_in_batch = 0
self.datas_in_batch = set()
break
# We do not know which changelog transfer failed, retry everything.
retry = True
tries += 1
if tries == self.MAX_RETRIES:
logging.error('changelogs %s could not be processed '
'completely - moving on...' %
' '.join(map(os.path.basename, changes)))
# Reset data counter on failure
self.status.dec_value("data", self.files_in_batch)
self.files_in_batch = 0
self.datas_in_batch = set()
if done:
xtl = (int(change.split('.')[-1]) - 1, 0)
self.upd_stime(xtl)
map(self.changelog_done_func, changes)
self.archive_and_purge_changelogs(changes)
break
# it's either entry_ops() or Rsync that failed to do it's
# job. Mostly it's entry_ops() [which currently has a problem
# of failing to create an entry but failing to return an errno]
# Therefore we do not know if it's either Rsync or the freaking
# entry_ops() that failed... so we retry the _whole_ changelog
# again.
# TODO: remove entry retries when it's gets fixed.
logging.warn('incomplete sync, retrying changelogs: %s' %
' '.join(map(os.path.basename, changes)))
# Reset the Data counter before Retry
self.status.dec_value("data", self.files_in_batch)
self.files_in_batch = 0
time.sleep(0.5)
def upd_stime(self, stime, path=None):
if not path:
path = self.FLAT_DIR_HIERARCHY
if not stime == URXTIME:
self.sendmark(path, stime)
# Update last_synced_time in status file based on stime
# only update stime if stime xattr set to Brick root
if path == self.FLAT_DIR_HIERARCHY:
chkpt_time = gconf.configinterface.get_realtime(
"checkpoint")
checkpoint_time = 0
if chkpt_time is not None:
checkpoint_time = int(chkpt_time)
self.status.set_last_synced(stime, checkpoint_time)
def update_worker_remote_node(self):
node = sys.argv[-1]
node_data = node.split("@")
node = node_data[-1]
remote_node_ip = node.split(":")[0]
self.status.set_slave_node(remote_node_ip)
def changelogs_batch_process(self, changes):
changelogs_batches = []
current_size = 0
for c in changes:
si = os.lstat(c).st_size
if (si + current_size) > MAX_CHANGELOG_BATCH_SIZE:
# Create new batch if single Changelog file greater than
# Max Size! or current batch size exceeds Max size
changelogs_batches.append([c])
current_size = si
else:
# Append to last batch, if No batches available Create one
current_size += si
if not changelogs_batches:
changelogs_batches.append([c])
else:
changelogs_batches[-1].append(c)
for batch in changelogs_batches:
logging.debug('processing changes %s' % repr(batch))
self.process(batch)
def crawl(self):
self.status.set_worker_crawl_status("Changelog Crawl")
changes = []
# get stime (from the brick) and purge changelogs
# that are _historical_ to that time.
purge_time = self.get_purge_time()
self.changelog_agent.scan()
self.crawls += 1
changes = self.changelog_agent.getchanges()
if changes:
if purge_time:
logging.info("slave's time: %s" % repr(purge_time))
processed = [x for x in changes
if int(x.split('.')[-1]) < purge_time[0]]
for pr in processed:
logging.info(
'skipping already processed change: %s...' %
os.path.basename(pr))
self.changelog_done_func(pr)
changes.remove(pr)
self.archive_and_purge_changelogs(processed)
self.changelogs_batch_process(changes)
def register(self, register_time, changelog_agent, status):
self.changelog_agent = changelog_agent
self.sleep_interval = int(gconf.change_interval)
self.changelog_done_func = self.changelog_agent.done
self.processed_changelogs_dir = os.path.join(self.setup_working_dir(),
".processed")
self.name = "live_changelog"
self.status = status
class GMasterChangeloghistoryMixin(GMasterChangelogMixin):
def register(self, register_time, changelog_agent, status):
self.changelog_agent = changelog_agent
self.changelog_register_time = register_time
self.history_crawl_start_time = register_time
self.changelog_done_func = self.changelog_agent.history_done
self.history_turns = 0
self.processed_changelogs_dir = os.path.join(self.setup_working_dir(),
".history/.processed")
self.name = "history_changelog"
self.status = status
def crawl(self):
self.history_turns += 1
self.status.set_worker_crawl_status("History Crawl")
purge_time = self.get_purge_time()
end_time = int(time.time())
logging.info('starting history crawl... turns: %s, stime: %s, etime: %s'
% (self.history_turns, repr(purge_time), repr(end_time)))
if not purge_time or purge_time == URXTIME:
logging.info("stime not available, abandoning history crawl")
raise NoPurgeTimeAvailable()
# Changelogs backend path is hardcoded as
# <BRICK_PATH>/.glusterfs/changelogs, if user configured to different
# location then consuming history will not work(Known issue as of now)
changelog_path = os.path.join(gconf.local_path,
".glusterfs/changelogs")
ret, actual_end = self.changelog_agent.history(
changelog_path,
purge_time[0],
end_time,
int(gconf.sync_jobs))
# scan followed by getchanges till scan returns zero.
# history_scan() is blocking call, till it gets the number
# of changelogs to process. Returns zero when no changelogs
# to be processed. returns positive value as number of changelogs
# to be processed, which will be fetched using
# history_getchanges()
while self.changelog_agent.history_scan() > 0:
self.crawls += 1
changes = self.changelog_agent.history_getchanges()
if changes:
if purge_time:
logging.info("slave's time: %s" % repr(purge_time))
processed = [x for x in changes
if int(x.split('.')[-1]) < purge_time[0]]
for pr in processed:
logging.info('skipping already processed change: '
'%s...' % os.path.basename(pr))
self.changelog_done_func(pr)
changes.remove(pr)
self.changelogs_batch_process(changes)
history_turn_time = int(time.time()) - self.history_crawl_start_time
logging.info('finished history crawl syncing, endtime: %s, stime: %s'
% (actual_end, repr(self.get_purge_time())))
# If TS returned from history_changelog is < register_time
# then FS crawl may be required, since history is only available
# till TS returned from history_changelog
if actual_end < self.changelog_register_time:
if self.history_turns < 2:
sleep_time = 1
if history_turn_time < CHANGELOG_ROLLOVER_TIME:
sleep_time = CHANGELOG_ROLLOVER_TIME - history_turn_time
time.sleep(sleep_time)
self.history_crawl_start_time = int(time.time())
self.crawl()
else:
# This exeption will be catched in resource.py and
# fallback to xsync for the small gap.
raise PartialHistoryAvailable(str(actual_end))
class GMasterXsyncMixin(GMasterChangelogMixin):
"""
This crawl needs to be xtime based (as of now
it's not. this is because we generate CHANGELOG
file during each crawl which is then processed
by process_change()).
For now it's used as a one-shot initial sync
mechanism and only syncs directories, regular
files, hardlinks and symlinks.
"""
XSYNC_MAX_ENTRIES = 1 << 13
def register(self, register_time=None, changelog_agent=None, status=None):
self.status = status
self.counter = 0
self.comlist = []
self.stimes = []
self.sleep_interval = 60
self.tempdir = self.setup_working_dir()
self.tempdir = os.path.join(self.tempdir, 'xsync')
self.processed_changelogs_dir = self.tempdir
self.name = "xsync"
logging.info('xsync temp directory: %s' % self.tempdir)
try:
os.makedirs(self.tempdir)
except OSError:
ex = sys.exc_info()[1]
if ex.errno == EEXIST and os.path.isdir(self.tempdir):
pass
else:
raise
def crawl(self):
"""
event dispatcher thread
this thread dispatches either changelog or synchronizes stime.
additionally terminates itself on receiving a 'finale' event
"""
def Xsyncer():
self.Xcrawl()
t = Thread(target=Xsyncer)
t.start()
logging.info('starting hybrid crawl..., stime: %s'
% repr(self.get_purge_time()))
self.status.set_worker_crawl_status("Hybrid Crawl")
while True:
try:
item = self.comlist.pop(0)
if item[0] == 'finale':
logging.info('finished hybrid crawl syncing, stime: %s'
% repr(self.get_purge_time()))
break
elif item[0] == 'xsync':
logging.info('processing xsync changelog %s' % (item[1]))
self.process([item[1]], 0)
self.archive_and_purge_changelogs([item[1]])
elif item[0] == 'stime':
logging.debug('setting slave time: %s' % repr(item[1]))
self.upd_stime(item[1][1], item[1][0])
else:
logging.warn('unknown tuple in comlist (%s)' % repr(item))
except IndexError:
time.sleep(1)
def write_entry_change(self, prefix, data=[]):
if not getattr(self, "fh", None):
self.open()
self.fh.write("%s %s\n" % (prefix, ' '.join(data)))
def open(self):
try:
self.xsync_change = os.path.join(
self.tempdir, 'XSYNC-CHANGELOG.' + str(int(time.time())))
self.fh = open(self.xsync_change, 'w')
except IOError:
raise
def close(self):
if getattr(self, "fh", None):
self.fh.flush()
os.fsync(self.fh.fileno())
self.fh.close()
self.fh = None
def fname(self):
return self.xsync_change
def put(self, mark, item):
self.comlist.append((mark, item))
def sync_xsync(self, last):
"""schedule a processing of changelog"""
self.close()
if self.counter > 0:
self.put('xsync', self.fname())
self.counter = 0
if not last:
time.sleep(1) # make sure changelogs are 1 second apart
def sync_stime(self, stime=None, last=False):
"""schedule a stime synchronization"""
if stime:
self.put('stime', stime)
if last:
self.put('finale', None)
def sync_done(self, stime=[], last=False):
self.sync_xsync(last)
if stime:
# Send last as True only for last stime entry
for st in stime[:-1]:
self.sync_stime(st, False)
if stime and stime[-1]:
self.sync_stime(stime[-1], last)
def is_sticky(self, path, mo):
"""check for DHTs linkto sticky bit file"""
sticky = False
if mo & 01000:
sticky = self.master.server.linkto_check(path)
return sticky
def Xcrawl(self, path='.', xtr_root=None):
"""
generate a CHANGELOG file consumable by process_change.
slave's xtime (stime) is _cached_ for comparisons across
the filesystem tree, but set after directory synchronization.
"""
if path == '.':
self.crawls += 1
if not xtr_root:
# get the root stime and use it for all comparisons
xtr_root = self.xtime('.', self.slave)
if isinstance(xtr_root, int):
if xtr_root != ENOENT:
logging.warn("slave cluster not returning the "
"correct xtime for root (%d)" % xtr_root)
xtr_root = self.minus_infinity
xtl = self.xtime(path)
if isinstance(xtl, int):
logging.warn("master cluster's xtime not found")
xtr = self.xtime(path, self.slave)
if isinstance(xtr, int):
if xtr != ENOENT:
logging.warn("slave cluster not returning the "
"correct xtime for %s (%d)" % (path, xtr))
xtr = self.minus_infinity
xtr = max(xtr, xtr_root)
zero_zero = (0, 0)
if xtr_root == zero_zero:
xtr = self.minus_infinity
if not self.need_sync(path, xtl, xtr):
if path == '.':
self.sync_done([(path, xtl)], True)
return
self.xtime_reversion_hook(path, xtl, xtr)
logging.debug("entering " + path)
dem = self.master.server.entries(path)
pargfid = self.master.server.gfid(path)
if isinstance(pargfid, int):
logging.warn('skipping directory %s' % (path))
for e in dem:
bname = e
e = os.path.join(path, e)
xte = self.xtime(e)
if isinstance(xte, int):
logging.warn("irregular xtime for %s: %s" %
(e, errno.errorcode[xte]))
continue
if not self.need_sync(e, xte, xtr):
continue
st = self.master.server.lstat(e)
if isinstance(st, int):
logging.warn('%s got purged in the interim ...' % e)
continue
if self.is_sticky(e, st.st_mode):
logging.debug('ignoring sticky bit file %s' % e)
continue
gfid = self.master.server.gfid(e)
if isinstance(gfid, int):
logging.warn('skipping entry %s..' % e)
continue
mo = st.st_mode
self.counter += 1 if ((stat.S_ISDIR(mo) or
stat.S_ISLNK(mo) or
stat.S_ISREG(mo))) else 0
if self.counter == self.XSYNC_MAX_ENTRIES:
self.sync_done(self.stimes, False)
self.stimes = []
if stat.S_ISDIR(mo):
self.write_entry_change("E", [gfid, 'MKDIR', str(mo),
str(0), str(0), escape(os.path.join(pargfid, bname))])
self.write_entry_change("M", [gfid, "SETATTR", str(st.st_uid),
str(st.st_gid), str(st.st_mode),
str(st.st_atime),
str(st.st_mtime)])
self.Xcrawl(e, xtr_root)
stime_to_update = xte
# Live Changelog Start time indicates that from that time
# onwards Live changelogs are available. If we update stime
# greater than live_changelog_start time then Geo-rep will
# skip those changelogs as already processed. But Xsync
# actually failed to sync the deletes and Renames. Update
# stime as min(Live_changelogs_time, Actual_stime) When it
# switches to Changelog mode, it syncs Deletes and Renames.
if self.live_changelog_start_time:
stime_to_update = min(self.live_changelog_start_time, xte)
self.stimes.append((e, stime_to_update))
elif stat.S_ISLNK(mo):
self.write_entry_change(
"E", [gfid, 'SYMLINK', escape(os.path.join(pargfid,
bname))])
elif stat.S_ISREG(mo):
nlink = st.st_nlink
nlink -= 1 # fixup backend stat link count
# if a file has a hardlink, create a Changelog entry as
# 'LINK' so the slave side will decide if to create the
# new entry, or to create link.
if nlink == 1:
self.write_entry_change("E",
[gfid, 'MKNOD', str(mo),
str(0), str(0),
escape(os.path.join(
pargfid, bname))])
else:
self.write_entry_change(
"E", [gfid, 'LINK', escape(os.path.join(pargfid,
bname))])
self.write_entry_change("D", [gfid])
if path == '.':
stime_to_update = xtl
if self.live_changelog_start_time:
stime_to_update = min(self.live_changelog_start_time, xtl)
self.stimes.append((path, stime_to_update))
self.sync_done(self.stimes, True)
class BoxClosedErr(Exception):
pass
class PostBox(list):
"""synchronized collection for storing things thought of as "requests" """
def __init__(self, *a):
list.__init__(self, *a)
# too bad Python stdlib does not have read/write locks...
# it would suffivce to grab the lock in .append as reader, in .close as
# writer
self.lever = Condition()
self.open = True
self.done = False
def wait(self):
"""wait on requests to be processed"""
self.lever.acquire()
if not self.done:
self.lever.wait()
self.lever.release()
return self.result
def wakeup(self, data):
"""wake up requestors with the result"""
self.result = data
self.lever.acquire()
self.done = True
self.lever.notifyAll()
self.lever.release()
def append(self, e):
"""post a request"""
self.lever.acquire()
if not self.open:
raise BoxClosedErr
list.append(self, e)
self.lever.release()
def close(self):
"""prohibit the posting of further requests"""
self.lever.acquire()
self.open = False
self.lever.release()
class Syncer(object):
"""a staged queue to relay rsync requests to rsync workers
By "staged queue" its meant that when a consumer comes to the
queue, it takes _all_ entries, leaving the queue empty.
(I don't know if there is an official term for this pattern.)
The queue uses a PostBox to accumulate incoming items.
When a consumer (rsync worker) comes, a new PostBox is
set up and the old one is passed on to the consumer.
Instead of the simplistic scheme of having one big lock
which synchronizes both the addition of new items and
PostBox exchanges, use a separate lock to arbitrate consumers,
and rely on PostBox's synchronization mechanisms take
care about additions.
There is a corner case racy situation, producers vs. consumers,
which is not handled by this scheme: namely, when the PostBox
exchange occurs in between being passed to the producer for posting
and the post placement. But that's what Postbox.close is for:
such a posting will find the PostBox closed, in which case
the producer can re-try posting against the actual PostBox of
the queue.
To aid accumlation of items in the PostBoxen before grabbed
by an rsync worker, the worker goes to sleep a bit after
each completed syncjob.
"""
def __init__(self, slave, sync_engine, resilient_errnos=[]):
"""spawn worker threads"""
self.log_err = False
self.slave = slave
self.lock = Lock()
self.pb = PostBox()
self.sync_engine = sync_engine
self.errnos_ok = resilient_errnos
for i in range(int(gconf.sync_jobs)):
t = Thread(target=self.syncjob)
t.start()
def syncjob(self):
"""the life of a worker"""
while True:
pb = None
while True:
self.lock.acquire()
if self.pb:
pb, self.pb = self.pb, PostBox()
self.lock.release()
if pb:
break
time.sleep(0.5)
pb.close()
po = self.sync_engine(pb, self.log_err)
if po.returncode == 0:
ret = (True, 0)
elif po.returncode in self.errnos_ok:
ret = (False, po.returncode)
else:
po.errfail()
pb.wakeup(ret)
def add(self, e):
while True:
pb = self.pb
try:
pb.append(e)
return pb
except BoxClosedErr:
pass
def enable_errorlog(self):
self.log_err = True
def disable_errorlog(self):
self.log_err = False
|