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From "Josh Elser (JIRA)" <>
Subject [jira] [Commented] (ACCUMULO-847) out of memory error creating native thread
Date Fri, 16 Nov 2012 02:20:13 GMT


Josh Elser commented on ACCUMULO-847:

I reran Eric's test on my box at home (8core, 16G of ram, 3 spinning disks for data dirs)
using the same Accumulo heap and native map sizes.

Relevant software versions:
* Sun JDK 1.6.0_37
* glibc-2.15-r3 (if it's important, I can resolve what Gentoo patched in the r3 version above
2.15 that the community tagged)
* Kernel 3.6.6

||Arenas||Thresh=0||Res Mem (GB)||

The big take-away I see from this is:

# Altering the number of arenas has the expected effect on resident memory
# On my system, I did *not* see resident memory rise out of reasonable bounds.
> out of memory error creating native thread
> ------------------------------------------
>                 Key: ACCUMULO-847
>                 URL:
>             Project: Accumulo
>          Issue Type: Bug
>          Components: tserver
>         Environment: RHEL6
>            Reporter: Eric Newton
>            Assignee: Keith Turner
>             Fix For: 1.5.0
> Long running tablet servers had many gigabytes of memory allocated above what was expected
(native + jvm).  Inspection of the heap did not show an unusual number of native objects allocated.
 Servers would eventually fail to create new threads.
> See HADOOP-7154 for the details.

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