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https://issues.apache.org/jira/browse/ACCUMULO-4080?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15062714#comment-15062714
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ASF GitHub Bot commented on ACCUMULO-4080:
------------------------------------------
GitHub user joshelser opened a pull request:
https://github.com/apache/accumulo/pull/58
ACCUMULO-4080 Only check /dev/ entries and FSes in [ext3, ext4, xfs].
By too aggressively monitoring filesystem mounts, we can actually
make accumulo unstable. Try to restrict what we monitor.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/joshelser/accumulo
ACCUMULO-4080-toned-back-mount-watching
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/accumulo/pull/58.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #58
----
commit d3d825b1517f9eb955c2285d1dd39ebfea2c7595
Author: Josh Elser <[email protected]>
Date: 2015-12-17T20:12:41Z
ACCUMULO-4080 Only check /dev/ entries and FSes in [ext3, ext4, xfs].
By too aggressively monitoring filesystem mounts, we can actually
make accumulo unstable. Try to restrict what we monitor.
----
> TabletServers should be less aggressively "monitoring RO filesystems"
> ---------------------------------------------------------------------
>
> Key: ACCUMULO-4080
> URL: https://issues.apache.org/jira/browse/ACCUMULO-4080
> Project: Accumulo
> Issue Type: Bug
> Components: tserver
> Affects Versions: 1.6.4, 1.7.0
> Environment: {{uname -a}}
> Linux os-r7-ncibzu-ambari-hv-r-upg-4-re1-4 3.10.0-123.9.3.el7.x86_64 #1 SMP
> Thu Nov 6 15:06:03 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux
> {{cat /etc/redhat-release}}
> CentOS Linux release 7.0.1406 (Core)
> Reporter: Josh Elser
> Assignee: Josh Elser
> Fix For: 1.6.5, 1.7.1, 1.8.0
>
>
> Ran into an automated test case where all of the tservers killed themselves
> on Centos7.
> {noformat}
> 2015-12-17 14:51:30,164 [util.FileSystemMonitor] FATAL: Exception while
> checking mount points, halting process
> java.lang.Exception: Filesystem /sys/fs/cgroup switched to read only
> at
> org.apache.accumulo.server.util.FileSystemMonitor.checkMounts(FileSystemMonitor.java:123)
> at
> org.apache.accumulo.server.util.FileSystemMonitor$1.run(FileSystemMonitor.java:90)
> at java.util.TimerThread.mainLoop(Timer.java:555)
> at java.util.TimerThread.run(Timer.java:505)
> {noformat}
> I'm not quite sure what exactly happened that caused /sys/fs/cgroup to
> suddenly be mounted as ro (my hunch is that it was an updated package).
> A workaround is to set {{tserver.monitor.fs}} to {{false}} in
> accumulo-site.xml and restart Accumulo.
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