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https://issues.apache.org/jira/browse/HADOOP-1184?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12488816
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Hairong Kuang commented on HADOOP-1184:
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For change 4:
The parameter to UnderReplicatedBlocks.getPriority() is the number of
nondecommisioning replicas. So I do not think by simply changing the priority
of blocks with 0 nondecomissioning replicas to be 0 solves the problem. If a
block has zero replicas, it needs to be deleted from the underReplicatedBlocks
queue by having an invalid priority level. Only the block with zero
nondecomissioning replicas needs to have 0 priority.
> 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: decommissionOneReplica2.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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