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Date: Fri, 6 Feb 2009 11:42:59 -0800 (PST)
From: "Raghu Angadi (JIRA)" <jira@apache.org>
To: core-dev@hadoop.apache.org
Subject: [jira] Commented: (HADOOP-5192) Block reciever should not remove a
 finalized block when block replication fails
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    [ https://issues.apache.org/jira/browse/HADOOP-5192?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12671271#action_12671271 ] 

Raghu Angadi commented on HADOOP-5192:
--------------------------------------

It does not look like it still correct yet. 
Say one thread is already writing a block 'B'.
and there here is another request to write the same block, then the second thread will see that 'B' still not a "valid block" and delete the files!

I think only the receiver thread that actually the owner/creator of the block should delete it.


> Block reciever should not remove a finalized block when block replication fails
> -------------------------------------------------------------------------------
>
>                 Key: HADOOP-5192
>                 URL: https://issues.apache.org/jira/browse/HADOOP-5192
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: dfs
>    Affects Versions: 0.18.3
>            Reporter: Hairong Kuang
>            Assignee: Hairong Kuang
>             Fix For: 0.18.4
>
>         Attachments: blockRemove.patch
>
>
> HADOOP-4702 makes block receivers to remove the received block in case of a block replication failure. But the block should not be removed if the cause of the failure is that the block to be received already exists. The key is that a block receiver should allow to remove only partial blocks in case of block replication failures. 

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