[jira] Updated: (HADOOP-1184) Decommission fails if a block that needs replication has only one replica

["dhruba borthakur (JIRA)" <ji...@apache.org>]

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

dhruba borthakur updated HADOOP-1184:
-------------------------------------

    Attachment: decommissionOneReplica.patch

This patch enhances TestDecommission to test the case when there is only one replica of a block. It also removes method filterDecommissionedNodes() because it was not essential.

The code change in neededReplications.update() needs some discussion. I did this as a short-cut to not propagate knowledge about "decommissioning" into neededReplications.getPriority().

> 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: decommissionOneReplica.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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