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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-7435) BuiltInGzipDecompressor is only released during full GC
Date Tue, 19 Mar 2013 17:19:17 GMT

    [ https://issues.apache.org/jira/browse/HBASE-7435?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13606538#comment-13606538
] 

Lars Hofhansl commented on HBASE-7435:
--------------------------------------

With this patch TestHFileBlock takes up tp 2.2g of resident heap, whereas without this patch
it takes only 700mb.
                
> BuiltInGzipDecompressor is only released during full GC
> -------------------------------------------------------
>
>                 Key: HBASE-7435
>                 URL: https://issues.apache.org/jira/browse/HBASE-7435
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Lars Hofhansl
>            Assignee: Lars Hofhansl
>             Fix For: 0.95.0, 0.94.4
>
>         Attachments: 7435-0.94.txt, 7435-0.96.txt
>
>
> That seems to be bug in Hadoop, actually.
> BuiltInGzipDecompressor.end() needs to be called to release it's resource, but it is
not called anywhere in CodecPool.
> Instead the end() is called by finalize(), which is only called during a full gc (or
never, depending on JVM).
> This is only an issue in test. In real life most folks will have the native GzipDecompressor

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