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From f40570f2f784dc61edb061a4931dcfc16bf51e7e Mon Sep 17 00:00:00 2001
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From: Aravinda VK <avishwan@redhat.com>
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Date: Mon, 5 Aug 2019 19:00:21 +0530
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Subject: [PATCH 277/284] geo-rep: Fix Config Get Race
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When two threads(sync jobs) in Geo-rep worker calls `gconf.get` and
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`gconf.getr`(realtime) at the sametime, `getr` resets the conf object
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and other one gets None. Thread Lock is introduced to fix the issue.
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```
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File "/usr/libexec/glusterfs/python/syncdaemon/syncdutils.py",
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line 368, in twrap
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tf(*aargs)
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File "/usr/libexec/glusterfs/python/syncdaemon/master.py", line 1987,
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in syncjob
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po = self.sync_engine(pb, self.log_err)
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File "/usr/libexec/glusterfs/python/syncdaemon/resource.py",
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line 1444, in rsync
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rconf.ssh_ctl_args + \
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AttributeError: 'NoneType' object has no attribute 'split'
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```
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Backport of:
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> Patch: https://review.gluster.org/#/c/glusterfs/+/23158/
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> Change-Id: I9c245e5c36338265354e158f5baa32b119eb2da5
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> Updates: bz#1737484
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> Signed-off-by: Aravinda VK <avishwan@redhat.com>
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Change-Id: I9c245e5c36338265354e158f5baa32b119eb2da5
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BUG: 1729915
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Signed-off-by: Kotresh HR <khiremat@redhat.com>
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Reviewed-on: https://code.engineering.redhat.com/gerrit/178960
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Tested-by: RHGS Build Bot <nigelb@redhat.com>
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Reviewed-by: Sunil Kumar Heggodu Gopala Acharya <sheggodu@redhat.com>
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---
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geo-replication/syncdaemon/gsyncdconfig.py | 27 +++++++++++++++++++++------
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1 file changed, 21 insertions(+), 6 deletions(-)
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diff --git a/geo-replication/syncdaemon/gsyncdconfig.py b/geo-replication/syncdaemon/gsyncdconfig.py
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index 1fc451f..38f3594 100644
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--- a/geo-replication/syncdaemon/gsyncdconfig.py
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+++ b/geo-replication/syncdaemon/gsyncdconfig.py
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@@ -17,6 +17,7 @@ import os
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import shutil
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from string import Template
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from datetime import datetime
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+from threading import Lock
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# Global object which can be used in other modules
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@@ -35,6 +36,7 @@ class GconfInvalidValue(Exception):
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class Gconf(object):
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def __init__(self, default_conf_file, custom_conf_file=None,
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args={}, extra_tmpl_args={}, override_from_args=False):
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+ self.lock = Lock()
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self.default_conf_file = default_conf_file
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self.custom_conf_file = custom_conf_file
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self.tmp_conf_file = None
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@@ -163,6 +165,11 @@ class Gconf(object):
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if value is not None and not self._is_valid_value(name, value):
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raise GconfInvalidValue()
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+
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+ def _load_with_lock(self):
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+ with self.lock:
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+ self._load()
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+
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def _load(self):
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self.gconf = {}
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self.template_conf = []
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@@ -230,12 +237,19 @@ class Gconf(object):
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self._tmpl_substitute()
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self._do_typecast()
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- def reload(self):
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+ def reload(self, with_lock=True):
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if self._is_config_changed():
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- self._load()
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+ if with_lock:
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+ self._load_with_lock()
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+ else:
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+ self._load()
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- def get(self, name, default_value=None):
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- return self.gconf.get(name, default_value)
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+ def get(self, name, default_value=None, with_lock=True):
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+ if with_lock:
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+ with self.lock:
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+ return self.gconf.get(name, default_value)
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+ else:
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+ return self.gconf.get(name, default_value)
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def getall(self, show_defaults=False, show_non_configurable=False):
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cnf = {}
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@@ -276,8 +290,9 @@ class Gconf(object):
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return cnf
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def getr(self, name, default_value=None):
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- self.reload()
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- return self.get(name, default_value)
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+ with self.lock:
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+ self.reload(with_lock=False)
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+ return self.get(name, default_value, with_lock=False)
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def get_help(self, name=None):
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pass
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--
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1.8.3.1
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