/usr/lib/x86_64-linux-gnu/glusterfs/python/syncdaemon/monitor.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 | #
# 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 signal
import logging
import uuid
import xml.etree.ElementTree as XET
from subprocess import PIPE
from resource import Popen, FILE, GLUSTER, SSH
from threading import Lock
from errno import ECHILD, ESRCH
import re
import random
from gconf import gconf
from syncdutils import select, waitpid, errno_wrap
from syncdutils import set_term_handler, is_host_local, GsyncdError
from syncdutils import escape, Thread, finalize, memoize
from gsyncdstatus import GeorepStatus, set_monitor_status
ParseError = XET.ParseError if hasattr(XET, 'ParseError') else SyntaxError
def get_subvol_num(brick_idx, vol, hot):
tier = vol.is_tier()
disperse_count = vol.disperse_count(tier, hot)
replica_count = vol.replica_count(tier, hot)
if (tier and not hot):
brick_idx = brick_idx - vol.get_hot_bricks_count(tier)
subvol_size = disperse_count if disperse_count > 0 else replica_count
cnt = int((brick_idx + 1) / subvol_size)
rem = (brick_idx + 1) % subvol_size
if rem > 0:
cnt = cnt + 1
if (tier and hot):
return "hot_" + str(cnt)
elif (tier and not hot):
return "cold_" + str(cnt)
else:
return str(cnt)
def get_slave_bricks_status(host, vol):
po = Popen(['gluster', '--xml', '--remote-host=' + host,
'volume', 'status', vol, "detail"],
stdout=PIPE, stderr=PIPE)
vix = po.stdout.read()
po.wait()
po.terminate_geterr(fail_on_err=False)
if po.returncode != 0:
logging.info("Volume status command failed, unable to get "
"list of up nodes of %s, returning empty list: %s" %
(vol, po.returncode))
return []
vi = XET.fromstring(vix)
if vi.find('opRet').text != '0':
logging.info("Unable to get list of up nodes of %s, "
"returning empty list: %s" %
(vol, vi.find('opErrstr').text))
return []
up_hosts = set()
try:
for el in vi.findall('volStatus/volumes/volume/node'):
if el.find('status').text == '1':
up_hosts.add(el.find('hostname').text)
except (ParseError, AttributeError, ValueError) as e:
logging.info("Parsing failed to get list of up nodes of %s, "
"returning empty list: %s" % (vol, e))
return list(up_hosts)
class Volinfo(object):
def __init__(self, vol, host='localhost', prelude=[]):
po = Popen(prelude + ['gluster', '--xml', '--remote-host=' + host,
'volume', 'info', vol],
stdout=PIPE, stderr=PIPE)
vix = po.stdout.read()
po.wait()
po.terminate_geterr()
vi = XET.fromstring(vix)
if vi.find('opRet').text != '0':
if prelude:
via = '(via %s) ' % prelude.join(' ')
else:
via = ' '
raise GsyncdError('getting volume info of %s%s '
'failed with errorcode %s' %
(vol, via, vi.find('opErrno').text))
self.tree = vi
self.volume = vol
self.host = host
def get(self, elem):
return self.tree.findall('.//' + elem)
def is_tier(self):
return (self.get('typeStr')[0].text == 'Tier')
def is_hot(self, brickpath):
logging.debug('brickpath: ' + repr(brickpath))
return brickpath in self.hot_bricks
@property
@memoize
def bricks(self):
def bparse(b):
host, dirp = b.text.split(':', 2)
return {'host': host, 'dir': dirp}
return [bparse(b) for b in self.get('brick')]
@property
@memoize
def uuid(self):
ids = self.get('id')
if len(ids) != 1:
raise GsyncdError("volume info of %s obtained from %s: "
"ambiguous uuid" % (self.volume, self.host))
return ids[0].text
def replica_count(self, tier, hot):
if (tier and hot):
return int(self.get('hotBricks/hotreplicaCount')[0].text)
elif (tier and not hot):
return int(self.get('coldBricks/coldreplicaCount')[0].text)
else:
return int(self.get('replicaCount')[0].text)
def disperse_count(self, tier, hot):
if (tier and hot):
# Tiering doesn't support disperse volume as hot brick,
# hence no xml output, so returning 0. In case, if it's
# supported later, we should change here.
return 0
elif (tier and not hot):
return int(self.get('coldBricks/colddisperseCount')[0].text)
else:
return int(self.get('disperseCount')[0].text)
@property
@memoize
def hot_bricks(self):
return [b.text for b in self.get('hotBricks/brick')]
def get_hot_bricks_count(self, tier):
if (tier):
return int(self.get('hotBricks/hotbrickCount')[0].text)
else:
return 0
class Monitor(object):
"""class which spawns and manages gsyncd workers"""
ST_INIT = 'Initializing...'
ST_STARTED = 'Started'
ST_STABLE = 'Active'
ST_FAULTY = 'Faulty'
ST_INCON = 'inconsistent'
_ST_ORD = [ST_STABLE, ST_INIT, ST_FAULTY, ST_INCON]
def __init__(self):
self.lock = Lock()
self.state = {}
self.status = {}
@staticmethod
def terminate():
# relax one SIGTERM by setting a handler that sets back
# standard handler
set_term_handler(lambda *a: set_term_handler())
# give a chance to graceful exit
errno_wrap(os.kill, [-os.getpid(), signal.SIGTERM], [ESRCH])
def monitor(self, w, argv, cpids, agents, slave_vol, slave_host, master):
"""the monitor loop
Basic logic is a blantantly simple blunt heuristics:
if spawned client survives 60 secs, it's considered OK.
This servers us pretty well as it's not vulneralbe to
any kind of irregular behavior of the child...
... well, except for one: if children is hung up on
waiting for some event, it can survive aeons, still
will be defunct. So we tweak the above logic to
expect the worker to send us a signal within 60 secs
(in the form of closing its end of a pipe). The worker
does this when it's done with the setup stage
ready to enter the service loop (note it's the setup
stage which is vulnerable to hangs -- the full
blown worker blows up on EPIPE if the net goes down,
due to the keep-alive thread)
"""
if not self.status.get(w[0], None):
self.status[w[0]] = GeorepStatus(gconf.state_file, w[0])
set_monitor_status(gconf.state_file, self.ST_STARTED)
self.status[w[0]].set_worker_status(self.ST_INIT)
ret = 0
def nwait(p, o=0):
try:
p2, r = waitpid(p, o)
if not p2:
return
return r
except OSError as e:
# no child process, this happens if the child process
# already died and has been cleaned up
if e.errno == ECHILD:
return -1
else:
raise
def exit_signalled(s):
""" child teminated due to receipt of SIGUSR1 """
return (os.WIFSIGNALED(s) and (os.WTERMSIG(s) == signal.SIGUSR1))
def exit_status(s):
if os.WIFEXITED(s):
return os.WEXITSTATUS(s)
return 1
conn_timeout = int(gconf.connection_timeout)
while ret in (0, 1):
remote_host = w[1]
# Check the status of the connected slave node
# If the connected slave node is down then try to connect to
# different up node.
m = re.match("(ssh|gluster|file):\/\/(.+)@([^:]+):(.+)",
remote_host)
if m:
current_slave_host = m.group(3)
slave_up_hosts = get_slave_bricks_status(
slave_host, slave_vol)
if current_slave_host not in slave_up_hosts:
if len(slave_up_hosts) > 0:
remote_host = "%s://%s@%s:%s" % (m.group(1),
m.group(2),
random.choice(
slave_up_hosts),
m.group(4))
# Spawn the worker and agent in lock to avoid fd leak
self.lock.acquire()
logging.info('-' * conn_timeout)
logging.info('starting gsyncd worker')
# Couple of pipe pairs for RPC communication b/w
# worker and changelog agent.
# read/write end for agent
(ra, ww) = os.pipe()
# read/write end for worker
(rw, wa) = os.pipe()
# spawn the agent process
apid = os.fork()
if apid == 0:
os.close(rw)
os.close(ww)
os.execv(sys.executable, argv + ['--local-path', w[0],
'--agent',
'--rpc-fd',
','.join([str(ra), str(wa),
str(rw), str(ww)])])
pr, pw = os.pipe()
cpid = os.fork()
if cpid == 0:
os.close(pr)
os.close(ra)
os.close(wa)
os.execv(sys.executable, argv + ['--feedback-fd', str(pw),
'--local-path', w[0],
'--local-id',
'.' + escape(w[0]),
'--rpc-fd',
','.join([str(rw), str(ww),
str(ra), str(wa)]),
'--subvol-num', str(w[2])] +
(['--is-hottier'] if w[3] else []) +
['--resource-remote', remote_host])
cpids.add(cpid)
agents.add(apid)
os.close(pw)
# close all RPC pipes in monitor
os.close(ra)
os.close(wa)
os.close(rw)
os.close(ww)
self.lock.release()
t0 = time.time()
so = select((pr,), (), (), conn_timeout)[0]
os.close(pr)
if so:
ret = nwait(cpid, os.WNOHANG)
ret_agent = nwait(apid, os.WNOHANG)
if ret_agent is not None:
# Agent is died Kill Worker
logging.info("Changelog Agent died, "
"Aborting Worker(%s)" % w[0])
errno_wrap(os.kill, [cpid, signal.SIGKILL], [ESRCH])
nwait(cpid)
nwait(apid)
if ret is not None:
logging.info("worker(%s) died before establishing "
"connection" % w[0])
nwait(apid) # wait for agent
else:
logging.debug("worker(%s) connected" % w[0])
while time.time() < t0 + conn_timeout:
ret = nwait(cpid, os.WNOHANG)
ret_agent = nwait(apid, os.WNOHANG)
if ret is not None:
logging.info("worker(%s) died in startup "
"phase" % w[0])
nwait(apid) # wait for agent
break
if ret_agent is not None:
# Agent is died Kill Worker
logging.info("Changelog Agent died, Aborting "
"Worker(%s)" % w[0])
errno_wrap(os.kill, [cpid, signal.SIGKILL], [ESRCH])
nwait(cpid)
nwait(apid)
break
time.sleep(1)
else:
logging.info("worker(%s) not confirmed in %d sec, "
"aborting it" % (w[0], conn_timeout))
errno_wrap(os.kill, [cpid, signal.SIGKILL], [ESRCH])
nwait(apid) # wait for agent
ret = nwait(cpid)
if ret is None:
self.status[w[0]].set_worker_status(self.ST_STABLE)
# If worker dies, agent terminates on EOF.
# So lets wait for agent first.
nwait(apid)
ret = nwait(cpid)
if exit_signalled(ret):
ret = 0
else:
ret = exit_status(ret)
if ret in (0, 1):
self.status[w[0]].set_worker_status(self.ST_FAULTY)
time.sleep(10)
self.status[w[0]].set_worker_status(self.ST_INCON)
return ret
def multiplex(self, wspx, suuid, slave_vol, slave_host, master):
argv = sys.argv[:]
for o in ('-N', '--no-daemon', '--monitor'):
while o in argv:
argv.remove(o)
argv.extend(('-N', '-p', '', '--slave-id', suuid))
argv.insert(0, os.path.basename(sys.executable))
cpids = set()
agents = set()
ta = []
for wx in wspx:
def wmon(w):
cpid, _ = self.monitor(w, argv, cpids, agents, slave_vol,
slave_host, master)
time.sleep(1)
self.lock.acquire()
for cpid in cpids:
errno_wrap(os.kill, [cpid, signal.SIGKILL], [ESRCH])
for apid in agents:
errno_wrap(os.kill, [apid, signal.SIGKILL], [ESRCH])
self.lock.release()
finalize(exval=1)
t = Thread(target=wmon, args=[wx])
t.start()
ta.append(t)
for t in ta:
t.join()
def distribute(*resources):
master, slave = resources
mvol = Volinfo(master.volume, master.host)
logging.debug('master bricks: ' + repr(mvol.bricks))
prelude = []
si = slave
slave_host = None
slave_vol = None
if isinstance(slave, SSH):
prelude = gconf.ssh_command.split() + [slave.remote_addr]
si = slave.inner_rsc
logging.debug('slave SSH gateway: ' + slave.remote_addr)
if isinstance(si, FILE):
sbricks = {'host': 'localhost', 'dir': si.path}
suuid = uuid.uuid5(uuid.NAMESPACE_URL, slave.get_url(canonical=True))
elif isinstance(si, GLUSTER):
svol = Volinfo(si.volume, slave.remote_addr.split('@')[-1])
sbricks = svol.bricks
suuid = svol.uuid
slave_host = slave.remote_addr.split('@')[-1]
slave_vol = si.volume
# save this xattr for the session delete command
old_stime_xattr_name = getattr(gconf, "master.stime_xattr_name", None)
new_stime_xattr_name = "trusted.glusterfs." + mvol.uuid + "." + \
svol.uuid + ".stime"
if not old_stime_xattr_name or \
old_stime_xattr_name != new_stime_xattr_name:
gconf.configinterface.set("master.stime_xattr_name",
new_stime_xattr_name)
else:
raise GsyncdError("unknown slave type " + slave.url)
logging.info('slave bricks: ' + repr(sbricks))
if isinstance(si, FILE):
slaves = [slave.url]
else:
slavenodes = set(b['host'] for b in sbricks)
if isinstance(slave, SSH) and not gconf.isolated_slave:
rap = SSH.parse_ssh_address(slave)
slaves = ['ssh://' + rap['user'] + '@' + h + ':' + si.url
for h in slavenodes]
else:
slavevols = [h + ':' + si.volume for h in slavenodes]
if isinstance(slave, SSH):
slaves = ['ssh://' + rap.remote_addr + ':' + v
for v in slavevols]
else:
slaves = slavevols
workerspex = []
for idx, brick in enumerate(mvol.bricks):
if is_host_local(brick['host']):
is_hot = mvol.is_hot(":".join([brick['host'], brick['dir']]))
workerspex.append((brick['dir'],
slaves[idx % len(slaves)],
get_subvol_num(idx, mvol, is_hot),
is_hot))
logging.info('worker specs: ' + repr(workerspex))
return workerspex, suuid, slave_vol, slave_host, master
def monitor(*resources):
# Check if gsyncd restarted in pause state. If
# yes, send SIGSTOP to negative of monitor pid
# to go back to pause state.
if gconf.pause_on_start:
errno_wrap(os.kill, [-os.getpid(), signal.SIGSTOP], [ESRCH])
"""oh yeah, actually Monitor is used as singleton, too"""
return Monitor().multiplex(*distribute(*resources))
|