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From "ryan rawson (JIRA)" <j...@apache.org>
Subject [jira] Assigned: (HBASE-1293) hfile doesn't recycle decompressors
Date Fri, 27 Mar 2009 22:58:50 GMT

     [ https://issues.apache.org/jira/browse/HBASE-1293?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

ryan rawson reassigned HBASE-1293:
----------------------------------

    Assignee: ryan rawson

> hfile doesn't recycle decompressors
> -----------------------------------
>
>                 Key: HBASE-1293
>                 URL: https://issues.apache.org/jira/browse/HBASE-1293
>             Project: Hadoop HBase
>          Issue Type: Bug
>    Affects Versions: 0.20.0
>         Environment: - all -
>            Reporter: ryan rawson
>            Assignee: ryan rawson
>             Fix For: 0.20.0
>
>         Attachments: HBASE-1293.patch
>
>
> The Compression codec stuff from hadoop has the concept of recycling compressors and
decompressors - this is because a compression codec uses "direct buffers" which reside outside
the JVM regular heap space.  There is a risk that under heavy concurrent load we could run
out of that 'direct buffer' heap space in the JVM.
> HFile does not call algorithm.returnDecompressor and returnCompressor.  We should fix
that.
> I found this bug via OOM crashes under jdk 1.7 - it appears to be partially due to the
size of my cluster (200gb, 800 regions, 19 servers) and partially due to weaknesses in JVM
1.7.

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