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https://issues.apache.org/jira/browse/ACCUMULO-1770?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13792736#comment-13792736
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Josh Elser commented on ACCUMULO-1770:
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bq. The one fact that bothers me is the use of swap without a negative impact
on performance
Hypothetically, I could see that. For example, what if you have a bunch of jars
in lib or lib/ext that you use very infrequently. These could be swapped to
disk and you likely wouldn't pay any penalty because you aren't using them. Of
course, that's just a guess and isn't founded at all (which goes back to your
'lack of tools to help' comment).
> 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: FragmentTest.java, memory-usage.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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