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From "Luke Lu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-8419) GzipCodec NPE upon reset with IBM JDK
Date Fri, 09 Nov 2012 17:18:12 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-8419?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13494133#comment-13494133
] 

Luke Lu commented on HADOOP-8419:
---------------------------------

Yu, Please click Submit patch to let jenkins to review the trunk patch.
                
> GzipCodec NPE upon reset with IBM JDK
> -------------------------------------
>
>                 Key: HADOOP-8419
>                 URL: https://issues.apache.org/jira/browse/HADOOP-8419
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: io
>    Affects Versions: 1.0.3
>            Reporter: Luke Lu
>            Assignee: Yu Li
>              Labels: gzip, ibm-jdk
>         Attachments: HADOOP-8419-branch-1.patch, HADOOP-8419-trunk.patch
>
>
> The GzipCodec 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 GZipCodec 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, which causes NPE upon reset. This seems to be an IBM
JDK quirk as Sun JDK and OpenJDK doesn't have this issue.

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