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Date: Thu, 17 Dec 2015 20:06:46 +0000 (UTC)
From: "Josh Elser (JIRA)" <jira@apache.org>
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Subject: [jira] [Commented] (ACCUMULO-4080) TabletServers should be less
 aggressively "monitoring RO filesystems"
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    [ https://issues.apache.org/jira/browse/ACCUMULO-4080?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15062695#comment-15062695 ] 

Josh Elser commented on ACCUMULO-4080:
--------------------------------------

n/m Billie just pointed out to me that I missed a check. It's only flipping when a drive that was rw became ro.

> 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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