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https://issues.apache.org/jira/browse/HDFS-2021?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13042384#comment-13042384
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Daryn Sharp commented on HDFS-2021:
-----------------------------------
+1
Looks good. Presumably increasing the number of writes and the chunk size is
to more easily induce the problem. I hope it doesn't add much runtime to the
test suite...
> 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
> 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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