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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 Sat, 06 Dec 2008 00:07:44 GMT

    [ https://issues.apache.org/jira/browse/HBASE-900?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12653992#action_12653992

stack commented on HBASE-900:

Looking more at my local heap, I see ReferenceQueues with links to megabytes of unreleased
data.  More evidence that we are not processing ReferenceQueues fast enough.  Need to fix.
 Might be able to go with bigger blockcache size if one Map of all blockcaches.

Looking at Andrew Purtell heap dump, it does not have the same character as mine where we
are holding on to blockcache items.  His heap has 30 instances of stack-based ByteArrayOutputStreams;
together they add up to 690MBs of data.  Trying to figure which BAOS is prob.  Our use in
hbase is innocent.  At moment the ipc Server use is suspect.  Digging.

> 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: 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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