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Posted to common-issues@hadoop.apache.org by "Yu Li (JIRA)" <ji...@apache.org> on 2012/11/08 08:14:13 UTC

[jira] [Updated] (HADOOP-8419) GzipCodec NPE upon reset with IBM JDK

     [ https://issues.apache.org/jira/browse/HADOOP-8419?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Yu Li updated HADOOP-8419:
--------------------------

    Attachment: HADOOP-8419-branch-1.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
>
>
> 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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