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https://issues.apache.org/jira/browse/HADOOP-1184?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12493431
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dhruba borthakur commented on HADOOP-1184:
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The change in API to UnderReplicatedBlocks is required because it is not an
inner class of FSNamesystem anymore. This change was made to facilitate
fine-grain locking of the namenode data structures. The locking model is
simpler if UnderReplicatedBlocks does not access global variables/methods of
FSnamesystem. Please let me know if this sounds reasonable.
> 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, decommissionOneReplica5.patch,
> decommissionOneReplica6.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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