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From "Eric Newton (JIRA)" <>
Subject [jira] [Commented] (ACCUMULO-847) out of memoryr error creating native thread
Date Thu, 15 Nov 2012 21:01:12 GMT


Eric Newton commented on ACCUMULO-847:

It's much worse than I thought.

Based on a user's ingest patterns, I created a new little test program to ingest random-length
values with random rows in a single column.  I ran experiments, watching resident memory use
of the tserver with top.  I experimented with the number of arenas and also setting M_MMAP_THRESHOLD_
to zero to force all memory allocations to mmap() and not sbrk().  At the end of the test,
I flushed all tables to disk, and waited for compactions to finish.

Here's the results for ingesting 10M k-v with a value size of 1-4096.

||Arenas||Thresh=0||Res Mem||Secs||

Pay no attention to the seconds column; I was doing other lightweight tasks on the computer
while the test ran, so I expected that much noise.

I've started to recommend 


in {{bin/}} and I will make the change for the trunk.

> out of memoryr 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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