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From "dhruba borthakur (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-5134) FSNamesystem#commitBlockSynchronization adds under-construction block locations to blocksMap
Date Tue, 17 Feb 2009 14:46:59 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-5134?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

dhruba borthakur updated HADOOP-5134:
-------------------------------------

    Attachment: commitBlockSync-0.18.patch

Patch for 0.18 branch.

> FSNamesystem#commitBlockSynchronization adds under-construction block locations to blocksMap
> --------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-5134
>                 URL: https://issues.apache.org/jira/browse/HADOOP-5134
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: dfs
>    Affects Versions: 0.18.2
>            Reporter: Hairong Kuang
>            Assignee: dhruba borthakur
>            Priority: Blocker
>             Fix For: 0.18.4, 0.19.1
>
>         Attachments: commitBlockSync-0.18.patch, commitBlockSync.patch, commitBlockSync2.patch,
commitBlockSync3.patch
>
>
> From my understanding of sync/append design, an under construction block should not have
any block locations associated with it in the blocksMap. So an under construction block will
not be managed by ReplicationMonitor.
> However, if there is an error in the write pipeline, a lease recovery will trigger a
call, commitBlockSynchronization, to NN. This call will add the successfully-recovered datanodes
to blocksMap. This seems to violate the design. It should update the targets of the last block
at INode instead. 

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