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From "Christopher Tubbs (JIRA)" <>
Subject [jira] [Commented] (ACCUMULO-4080) TabletServers should be less aggressively "monitoring RO filesystems"
Date Thu, 17 Dec 2015 19:44:46 GMT


Christopher Tubbs commented on ACCUMULO-4080:

It would have to be one of:


`rpm -q --scritps initscripts` just shows a `systemctl daemon-reload`. Checking systemd shows
it's doing that, plus a bunch more that I don't understand. The others don't really do much
other than lay out files and call ldconfig, so I'm sure they're not the problem.

In general, I think updates to systemd are going to be disruptive in unpredictable ways. Not
really sure we can do much about that.

> TabletServers should be less aggressively "monitoring RO filesystems"
> ---------------------------------------------------------------------
>                 Key: ACCUMULO-4080
>                 URL:
>             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(
>         at org.apache.accumulo.server.util.FileSystemMonitor$
>         at java.util.TimerThread.mainLoop(
>         at
> {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

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