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From "stack (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-900) Regionserver memory leak causing OOME during relatively modest bulk importing
Date Wed, 10 Dec 2008 21:54:44 GMT

    [ https://issues.apache.org/jira/browse/HBASE-900?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12655378#action_12655378
] 

stack commented on HBASE-900:
-----------------------------

Our calculation of MemCache sizes is way off.  Our math says the aggregate of all Memcaches
is 200MB.  In the profiler, the 153 Memcaches present on OOME have 800MBs accumulated.  Working
on a better memcache sizer.

Other items, the presence of compressors/decompressors is 'normal'.  A mapfile index is block
compressed.  Bad news is that though the index file is closed as soon as possible, allocated
buffers for decompressors stick around (MapFile keeps reference to the index SequenceFile
so its not GC'd).  OK news is that in scheme of things, accounts for small amount of heap
-- about 10MB in tim's case.

> Regionserver memory leak causing OOME during relatively modest bulk importing
> -----------------------------------------------------------------------------
>
>                 Key: HBASE-900
>                 URL: https://issues.apache.org/jira/browse/HBASE-900
>             Project: Hadoop HBase
>          Issue Type: Bug
>    Affects Versions: 0.18.1, 0.19.0
>            Reporter: Jonathan Gray
>            Assignee: stack
>            Priority: Blocker
>         Attachments: 900.patch, memoryOn13.png
>
>
> I have recreated this issue several times and it appears to have been introduced in 0.2.
> During an import to a single table, memory usage of individual region servers grows w/o
bounds and when set to the default 1GB it will eventually die with OOME.  This has happened
to me as well as Daniel Ploeg on the mailing list.  In my case, I have 10 RS nodes and OOME
happens w/ 1GB heap at only about 30-35 regions per RS.  In previous versions, I have imported
to several hundred regions per RS with default heap size.
> I am able to get past this by increasing the max heap to 2GB.  However, the appearance
of this in newer versions leads me to believe there is now some kind of memory leak happening
in the region servers during import.

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