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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-9665) BlockDecompressorStream#decompress will throw EOFException instead of return -1 when EOF
Date Mon, 24 Jun 2013 03:30:22 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-9665?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13691681#comment-13691681
] 

Hadoop QA commented on HADOOP-9665:
-----------------------------------

{color:green}+1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12589361/HADOOP-9665.2.patch
  against trunk revision .

    {color:green}+1 @author{color}.  The patch does not contain any @author tags.

    {color:green}+1 tests included{color}.  The patch appears to include 1 new or modified
test files.

    {color:green}+1 javac{color}.  The applied patch does not increase the total number of
javac compiler warnings.

    {color:green}+1 javadoc{color}.  The javadoc tool did not generate any warning messages.

    {color:green}+1 eclipse:eclipse{color}.  The patch built with eclipse:eclipse.

    {color:green}+1 findbugs{color}.  The patch does not introduce any new Findbugs (version
1.3.9) warnings.

    {color:green}+1 release audit{color}.  The applied patch does not increase the total number
of release audit warnings.

    {color:green}+1 core tests{color}.  The patch passed unit tests in hadoop-common-project/hadoop-common.

    {color:green}+1 contrib tests{color}.  The patch passed contrib unit tests.

Test results: https://builds.apache.org/job/PreCommit-HADOOP-Build/2699//testReport/
Console output: https://builds.apache.org/job/PreCommit-HADOOP-Build/2699//console

This message is automatically generated.
                
> BlockDecompressorStream#decompress will throw EOFException instead of return -1 when
EOF
> ----------------------------------------------------------------------------------------
>
>                 Key: HADOOP-9665
>                 URL: https://issues.apache.org/jira/browse/HADOOP-9665
>             Project: Hadoop Common
>          Issue Type: Bug
>    Affects Versions: 1.1.2, 2.1.0-beta, 2.2.0
>            Reporter: Zhijie Shen
>            Assignee: Zhijie Shen
>            Priority: Critical
>         Attachments: HADOOP-9665.1.patch, HADOOP-9665.2.patch
>
>
> BlockDecompressorStream#decompress ultimately calls rawReadInt, which will throw EOFException
instead of return -1 when encountering end of a stream. Then, decompress will be called by
read. However, InputStream#read is supposed to return -1 instead of throwing EOFException
to indicate the end of a stream. This explains why in LineReader,
> {code}
>       if (bufferPosn >= bufferLength) {
>         startPosn = bufferPosn = 0;
>         if (prevCharCR)
>           ++bytesConsumed; //account for CR from previous read
>         bufferLength = in.read(buffer);
>         if (bufferLength <= 0)
>           break; // EOF
>       }
> {code}
> -1 is checked instead of catching EOFException.
> Now the problem will occur with SnappyCodec. If an input file is compressed with SnappyCodec,
it needs to be decompressed through BlockDecompressorStream when it is read. Then, if it empty,
EOFException will been thrown from rawReadInt and break LineReader.

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