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https://issues.apache.org/jira/browse/HADOOP-1184?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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dhruba borthakur updated HADOOP-1184:
-------------------------------------

    Attachment: decommissionOneReplica4.patch

Incorporated Hairong's review comments.

> Decommission fails if a block that needs replication has only one replica
> -------------------------------------------------------------------------
>
>                 Key: HADOOP-1184
>                 URL: https://issues.apache.org/jira/browse/HADOOP-1184
>             Project: Hadoop
>          Issue Type: Bug
>          Components: dfs
>            Reporter: dhruba borthakur
>         Attachments: decommissionOneReplica3.patch, 
> decommissionOneReplica4.patch
>
>
> If the only replica of a block resides on a node being decommissioned, then 
> the decommission command does not complete. The blocks do not get added to 
> neededReplication because neededReplications.update() believes that the 
> number of current replicas is zero.

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