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From "Eric Yang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-8419) GzipCodec NPE upon reset with IBM JDK
Date Sat, 16 Feb 2013 19:05:13 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-8419?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13579875#comment-13579875
] 

Eric Yang commented on HADOOP-8419:
-----------------------------------

Matt, the failures is not related to this patch in HDFS trunk failure case.  HDFS test case
is failing due to HADOOP-9067.  I also reverted this patch completely and reran the test case
to be sure that this patch was not trigger any strange hidden behavior.

Amir, the test case has been tested on power platform on ppc Jenkins server.  We did not see
the regression issue that you mentioned.  Could you provide IBM JDK version number that has
this regression fixed in zLinux?  This will help us to make sure the logic is only target
specific version ranges of IBM jdk that have this bug.  Since you are using the same ppc Jenkins
server to do the test, I don't think you will see any regression.  I am inclined to close
this issue baring no objections.
                
> 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
>             Fix For: 1.1.2
>
>         Attachments: HADOOP-8419-branch-1.patch, HADOOP-8419-branch1-v2.patch, HADOOP-8419-trunk.patch,
HADOOP-8419-trunk-v2.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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