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Date: Sat, 22 Nov 2008 11:52:44 -0800 (PST)
From: "Andrew Purtell (JIRA)" <jira@apache.org>
To: hbase-dev@hadoop.apache.org
Subject: [jira] Commented: (HBASE-900) Regionserver memory leak causing OOME
 during relatively modest bulk importing
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    [ https://issues.apache.org/jira/browse/HBASE-900?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12649971#action_12649971 ] 

Andrew Purtell commented on HBASE-900:
--------------------------------------

Last night under Heritrix hbase-writer stress I had a regionserver with 2GB heap go down with an OOME. It was serving 4 regions only. 

class [B 27343 2008042041
class [C 11714 966164
class org.apache.hadoop.hbase.HStoreKey 9781 312992
class java.util.TreeMap$Entry 7596 311436
class [Lorg.apache.hadoop.io.WritableComparable; 17 139536


> 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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