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From "Eric Newton (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ACCUMULO-1770) out of memory error on very long running tablet server
Date Thu, 17 Oct 2013 20:28:41 GMT

    [ https://issues.apache.org/jira/browse/ACCUMULO-1770?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13798369#comment-13798369
] 

Eric Newton commented on ACCUMULO-1770:
---------------------------------------

OK, I've attached a graph comparing long runs with mmap'ing in glibc memory allocator, and
without.  There's a little more memory usage in the mmap version.  Maybe over the course of
a couple months this might add up to an extra 16G, but I doubt it.  The usage looks really
flat.

> out of memory error on very long running tablet server
> ------------------------------------------------------
>
>                 Key: ACCUMULO-1770
>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-1770
>             Project: Accumulo
>          Issue Type: Bug
>          Components: tserver
>            Reporter: Eric Newton
>            Assignee: Eric Newton
>         Attachments: comparing-glibc-settings.png, FragmentTest.java, FragmentTest.java,
javamap.png, memory-usage.png, nativemap.png, no-mmap.png, three-day-tserver.png
>
>
> On a large cluster it was noticed that a few of the tablet servers had been pushed into
swap.  This didn't effect the performance of the server until it ran out of memory, and the
process was killed.  The gc reports in the debug log showed the system had plenty of heap
space for the JVM.  The number of threads in the server were not excessive (dozens).  This
cluster ingests some large values (megabytes).  The tablet server had been up for a month
prior to running out of memory.  MALLOC_ARENA_MAX had already been set to 1.
> * Investigate the effect of fragmentation on memory usage for large value inserts.



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