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From "Christian Kunz (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-3294) distcp leaves empty blocks afte successful execution
Date Tue, 22 Apr 2008 16:55:23 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-3294?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12591363#action_12591363
] 

Christian Kunz commented on HADOOP-3294:
----------------------------------------

> Verifying file sizes could have some implication when we support "appends".
Also, in this case the file time changes -- further, if the destination filesize is suspect
(a multiple of blocksize inclueing 0) it would not hurt to copy such a file again (e.g. n
the reducer)

> distcp leaves empty blocks afte successful execution
> ----------------------------------------------------
>
>                 Key: HADOOP-3294
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3294
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: util
>    Affects Versions: 0.16.3
>         Environment: 0.16.3 without any patches. Dfs permissions turned off everywhere,
such that HADOOP-3138 and HADOOP-3186 do not apply
>            Reporter: Christian Kunz
>
> I copied around 40 TB between two hadoop clusters, with distcp running on source.
> Job was *successful*, but one destination file was empty because of its only block being
empty.
> None of the distcp log files have any mentioning of this file.
> There were a couple of messages in the namenode server log of the destination cluster
referencing the file:
> hadoop-xxxnamenode-yyy.log.2008-04-19:2008-04-19 02:19:15,666 INFO org.apache.hadoop.dfs.StateChange:
BLOCK* NameSystem.allocateBlock: destinationDir/_distcp_tmp_z0g93p/fileName. blk_-9209890281741927376
> hadoop-xxx-namenode-yyy.log.2008-04-19:2008-04-19 02:54:45,820 WARN org.apache.hadoop.dfs.StateChange:
DIR* NameSystem.internalReleaseCreate: attempt to release a create lock on destinationDir/_distcp_tmp_z0g93p/fileName
file does not exist.
> distcp should not rely on the user to double-check.
> Would it make sense to add a reducer  to compare destination file sizes with source files
sizes and do some appropriate action?

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