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https://issues.apache.org/jira/browse/HDFS-2757?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13549819#comment-13549819
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Kihwal Lee commented on HDFS-2757:
----------------------------------
Pulled into branch-0.23 (23.6).
> Cannot read a local block that's being written to when using the local read
> short circuit
> -----------------------------------------------------------------------------------------
>
> Key: HDFS-2757
> URL: https://issues.apache.org/jira/browse/HDFS-2757
> Project: Hadoop HDFS
> Issue Type: Bug
> Affects Versions: 1.0.0
> Reporter: Jean-Daniel Cryans
> Assignee: Jean-Daniel Cryans
> Fix For: 1.2.0, 2.0.2-alpha
>
> Attachments: hdfs-2757-b1.txt, HDFS-2757-branch-1.patch,
> HDFS-2757-branch-1-v2.patch, HDFS-2757-trunk.patch, hdfs-2757.txt
>
>
> When testing the tail'ing of a local file with the read short circuit on, I
> get:
> {noformat}
> 2012-01-06 00:17:31,598 WARN org.apache.hadoop.hdfs.DFSClient:
> BlockReaderLocal requested with incorrect offset: Offset 0 and length
> 8230400 don't match block blk_-2842916025951313698_454072 ( blockLen 124 )
> 2012-01-06 00:17:31,598 WARN org.apache.hadoop.hdfs.DFSClient:
> BlockReaderLocal: Removing blk_-2842916025951313698_454072 from cache because
> local file
> /export4/jdcryans/dfs/data/blocksBeingWritten/blk_-2842916025951313698 could
> not be opened.
> 2012-01-06 00:17:31,599 INFO org.apache.hadoop.hdfs.DFSClient: Failed to read
> block blk_-2842916025951313698_454072 on local machine java.io.IOException:
> Offset 0 and length 8230400 don't match block blk_-2842916025951313698_454072
> ( blockLen 124 )
> 2012-01-06 00:17:31,599 INFO org.apache.hadoop.hdfs.DFSClient: Try reading
> via the datanode on /10.4.13.38:51010
> java.io.EOFException:
> hdfs://sv4r11s38:9100/hbase-1/.logs/sv4r13s38,62023,1325808100311/sv4r13s38%2C62023%2C1325808100311.1325808100818,
> entryStart=7190409, pos=8230400, end=8230400, edit=5
> {noformat}
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