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Date: Fri, 29 Oct 2010 07:22:34 -0400 (EDT)
From: "Hudson (JIRA)" <jira@apache.org>
To: common-issues@hadoop.apache.org
Subject: [jira] Commented: (HADOOP-6663) BlockDecompressorStream get EOF
 exception when decompressing the file compressed from empty file
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    [ https://issues.apache.org/jira/browse/HADOOP-6663?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12926240#action_12926240 ] 

Hudson commented on HADOOP-6663:
--------------------------------

Integrated in Hadoop-Common-trunk #496 (See [https://hudson.apache.org/hudson/job/Hadoop-Common-trunk/496/])
    HADOOP-6663.  BlockDecompressorStream get EOF exception when decompressing the file compressed from empty file.  Contributed by Kang Xiao.


> BlockDecompressorStream get EOF exception when decompressing the file compressed from empty file
> ------------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-6663
>                 URL: https://issues.apache.org/jira/browse/HADOOP-6663
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: io
>    Affects Versions: 0.20.2
>            Reporter: Kang Xiao
>            Assignee: Kang Xiao
>             Fix For: 0.22.0
>
>         Attachments: BlockDecompressorStream.java.patch, BlockDecompressorStream.java.patch, BlockDecompressorStream.patch, HADOOP-6663.patch
>
>
> An empty file can be compressed using BlockDecompressorStream, which is for block-based compressiong algorithm such as LZO. However, when decompressing the compressed file, BlockDecompressorStream get EOF exception.
> Here is a typical exception stack:
> java.io.EOFException
> at org.apache.hadoop.io.compress.BlockDecompressorStream.rawReadInt(BlockDecompressorStream.java:125)
> at org.apache.hadoop.io.compress.BlockDecompressorStream.getCompressedData(BlockDecompressorStream.java:96)
> at org.apache.hadoop.io.compress.BlockDecompressorStream.decompress(BlockDecompressorStream.java:82)
> at org.apache.hadoop.io.compress.DecompressorStream.read(DecompressorStream.java:74)
> at java.io.InputStream.read(InputStream.java:85)
> at org.apache.hadoop.util.LineReader.readLine(LineReader.java:134)
> at org.apache.hadoop.mapred.LineRecordReader.next(LineRecordReader.java:134)
> at org.apache.hadoop.mapred.LineRecordReader.next(LineRecordReader.java:39)
> at org.apache.hadoop.mapred.MapTask$TrackedRecordReader.moveToNext(MapTask.java:186)
> at org.apache.hadoop.mapred.MapTask$TrackedRecordReader.next(MapTask.java:170)
> at org.apache.hadoop.mapred.MapRunner.run(MapRunner.java:48)
> at org.apache.hadoop.streaming.PipeMapRunner.run(PipeMapRunner.java:18)
> at org.apache.hadoop.mapred.MapTask.run(MapTask.java:334)
> at org.apache.hadoop.mapred.Child.main(Child.java:196)

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