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Date: Wed, 1 Jun 2011 03:37:47 +0000 (UTC)
From: "John George (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
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Subject: [jira] [Updated] (HDFS-2021) HDFS Junit test TestWriteRead failed
 with inconsistent visible length of a file
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     [ https://issues.apache.org/jira/browse/HDFS-2021?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

John George updated HDFS-2021:
------------------------------

    Status: Patch Available  (was: Open)

> HDFS Junit test 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
>         Environment: Linux RHEL5
>            Reporter: CW Chung
>            Assignee: John George
>            Priority: Minor
>         Attachments: 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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