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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2021) TestWriteRead failed with inconsistent visible length of a file
Date Thu, 02 Jun 2011 12:38:48 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2021?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13042740#comment-13042740
] 

Hudson commented on HDFS-2021:
------------------------------

Integrated in Hadoop-Hdfs-trunk #685 (See [https://builds.apache.org/hudson/job/Hadoop-Hdfs-trunk/685/])
    HDFS-2021. Update numBytesAcked before sending the ack in PacketResponder.  Contributed
by John George

szetszwo : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1130339
Files : 
* /hadoop/hdfs/trunk/src/java/org/apache/hadoop/hdfs/server/datanode/BlockReceiver.java
* /hadoop/hdfs/trunk/src/test/hdfs/org/apache/hadoop/hdfs/TestWriteRead.java
* /hadoop/hdfs/trunk/CHANGES.txt


> TestWriteRead failed with inconsistent visible length of a file 
> ----------------------------------------------------------------
>
>                 Key: HDFS-2021
>                 URL: https://issues.apache.org/jira/browse/HDFS-2021
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: data-node
>         Environment: Linux RHEL5
>            Reporter: CW Chung
>            Assignee: John George
>             Fix For: 0.23.0
>
>         Attachments: HDFS-2021-2.patch, HDFS-2021.patch
>
>
> The junit test failed when iterates a number of times with larger chunk size on Linux.
Once a while, the visible number of bytes seen by a reader is slightly less than what was
supposed to be. 
> When run with the following parameter, it failed more often on Linux ( as reported by
John George) than my Mac:
>   private static final int WR_NTIMES = 300;
>   private static final int WR_CHUNK_SIZE = 10000;
> Adding more debugging output to the source, this is a sample of the output:
> Caused by: java.io.IOException: readData mismatch in byte read: expected=2770000 ; got
2765312
>         at org.apache.hadoop.hdfs.TestWriteRead.readData(TestWriteRead.java:141)

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