[ http://issues.apache.org/jira/browse/HADOOP-508?page=all ]
Milind Bhandarkar updated HADOOP-508:
-------------------------------------
Attachment: hadoop-508.patch
Fixed.
> random seeks using FSDataInputStream can become invalid such that reads
> return invalid data
> -------------------------------------------------------------------------------------------
>
> Key: HADOOP-508
> URL: http://issues.apache.org/jira/browse/HADOOP-508
> Project: Hadoop
> Issue Type: Bug
> Components: dfs
> Affects Versions: 0.6.2
> Reporter: Christian Kunz
> Assigned To: Milind Bhandarkar
> Fix For: 0.7.0
>
> Attachments: hadoop-508.patch
>
>
> Some of my applications using Hadoop DFS receive wrong data after certain
> random seeks. After some investigation I believe (without looking at source
> code of java.io.BufferedInputStream) that it basically boils down to the fact
> that the method
> read(byte[] b, int off, int len), when called with an external buffer larger
> than the internal buffer, reads into the external buffer directly without
> using the internal buffer anymore, but without invalidating the internal
> buffer by setting the variable 'count' to 0 such that a subsequent seek to an
> offset which is closer to the 'position' of the Positioncache than the
> internal buffersize will put the current position into the internal buffer
> containing outdated data from somewhere else.
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