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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-7145) ReusableStreamGzipCodec NPE upon reset with IBM JDK
Date Wed, 19 Dec 2012 17:57:13 GMT

    [ https://issues.apache.org/jira/browse/HBASE-7145?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13536195#comment-13536195
] 

stack commented on HBASE-7145:
------------------------------

You do this +        JVM jvm = new JVM();.  Is it needed?  Can all in JVM be static (I've
not looked... makes it less useful if have to instantiate it to use it).  Then you do private
static boolean HAS_BROKEN_FINISH = JVM.isBrokenFinish();

Thanks.
                
> ReusableStreamGzipCodec NPE upon reset with IBM JDK
> ---------------------------------------------------
>
>                 Key: HBASE-7145
>                 URL: https://issues.apache.org/jira/browse/HBASE-7145
>             Project: HBase
>          Issue Type: Sub-task
>    Affects Versions: 0.94.0
>            Reporter: Yu Li
>            Assignee: Yu Li
>              Labels: gzip, ibm-jdk
>             Fix For: 0.96.0
>
>         Attachments: 7145-trunk-v3.txt, HBASE-7145.1.patch.txt, HBASE-7145.2_trunk.patch.txt
>
>
> This is the same issue as described in HADOOP-8419, repeat the issue description here:
> The ReusableStreamGzipCodec will NPE upon reset after finish when the native zlib codec
is not loaded. When the native zlib is loaded the codec creates a CompressorOutputStream that
doesn't have the problem, otherwise, the ReusableStreamGzipCodec uses GZIPOutputStream which
is extended to provide the resetState method. Since IBM JDK 6 SR9 FP2 including the current
JDK 6 SR10, GZIPOutputStream#finish will release the underlying deflater(calls the deflater's
end method), which causes NPE upon reset. This seems to be an IBM JDK quirk as Sun JDK and
OpenJDK doesn't have this issue.
> Since in HBASE-5387 HBase source has refactor its code not to use hadoop's GzipCodec
during real compress/decompress, it's necessary to make a separate patch for HBase on the
same issue

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