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From "CW Chung (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-2021) HDFS Junit test TestWriteRead failed with inconsistent visible length of a file
Date Tue, 31 May 2011 21:17:07 GMT
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


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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