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Hudson commented on HDFS-1907:
------------------------------
Integrated in Hadoop-Hdfs-trunk #688 (See [https://builds.apache.org/hudson/job/Hadoop-Hdfs-trunk/688/])
> BlockMissingException upon concurrent read and write: reader was doing file position
read while writer is doing write without hflush
> ------------------------------------------------------------------------------------------------------------------------------------
>
> Key: HDFS-1907
> URL: https://issues.apache.org/jira/browse/HDFS-1907
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: hdfs client
> Affects Versions: 0.23.0
> Environment: Run on a real cluster. Using the latest 0.23 build.
> Reporter: CW Chung
> Assignee: John George
> Fix For: 0.23.0
>
> Attachments: HDFS-1907-2.patch, HDFS-1907-3.patch, HDFS-1907-4.patch, HDFS-1907-5.patch,
HDFS-1907-5.patch, HDFS-1907.patch
>
>
> BlockMissingException is thrown under this test scenario:
> Two different processes doing concurrent file r/w: one read and the other write on the
same file
> - writer keep doing file write
> - reader doing position file read from beginning of the file to the visible end of
file, repeatedly
> The reader is basically doing:
> byteRead = in.read(currentPosition, buffer, 0, byteToReadThisRound);
> where CurrentPostion=0, buffer is a byte array buffer, byteToReadThisRound = 1024*10000;
> Usually it does not fail right away. I have to read, close file, re-open the same file
a few times to create the problem. I'll pose a test program to repro this problem after I've
cleaned up a bit my current test program.
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