[jira] [Created] (ACCUMULO-4080) TabletServers should be less aggressively "monitoring RO filesystems"

["Josh Elser (JIRA)" <ji...@apache.org>]

Josh Elser created ACCUMULO-4080:
------------------------------------

             Summary: 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: 1.7.0, 1.6.4
         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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