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From "Eric Newton (JIRA)" <>
Subject [jira] [Commented] (ACCUMULO-1770) out of memory error on very long running tablet server
Date Fri, 11 Oct 2013 21:08:41 GMT


Eric Newton commented on ACCUMULO-1770:

I created a slightly different test.

Endlessly ingest a random key that has a of length 2048-4096.  Measure the resident size of
the tserver over time.  With the native map, the resident memory grows at about 40M/hour.
 With the Java InMemoryMap, resident size grows more slowly (but takes up more memory initially).

I ran both for two hours.  I've attached graphs of the data collected.

> out of memory error on very long running tablet server
> ------------------------------------------------------
>                 Key: ACCUMULO-1770
>                 URL:
>             Project: Accumulo
>          Issue Type: Bug
>          Components: tserver
>            Reporter: Eric Newton
>            Assignee: Eric Newton
>         Attachments:, javamap.png, memory-usage.png, nativemap.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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