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From "Eli Collins (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2757) Cannot read a local block that's being written to when using the local read short circuit
Date Sat, 08 Sep 2012 20:36:09 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2757?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13451401#comment-13451401
] 

Eli Collins commented on HDFS-2757:
-----------------------------------

+1 looks good, thanks JD!
                
> 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: 1.1.0
>
>         Attachments: HDFS-2757-branch-1.patch, HDFS-2757-branch-1-v2.patch, HDFS-2757-trunk.patch
>
>
> 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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