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https://issues.apache.org/jira/browse/HDFS-1300?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dmytro Molkov updated HDFS-1300:
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Attachment: HDFS-1300.patch
Please have a look at the patch.
Instead of inserting only when it doesn't exist we should rather follow the
same way we handle dead datanodes. Update the block, so it will move up in
priority queues when more nodes get decommissioned.
> Decommissioning nodes does not increase replication priority
> ------------------------------------------------------------
>
> Key: HDFS-1300
> URL: https://issues.apache.org/jira/browse/HDFS-1300
> Project: Hadoop HDFS
> Issue Type: Bug
> Affects Versions: 0.20-append, 0.20.1, 0.20.2, 0.20.3, 0.21.0, 0.22.0
> Reporter: Dmytro Molkov
> Assignee: Dmytro Molkov
> Fix For: 0.22.0
>
> Attachments: HDFS-1300.patch
>
>
> Currently when you decommission a node each block is only inserted into
> neededReplications if it is not there yet. This causes a problem of a block
> sitting in a low priority queue when all replicas sit on the nodes being
> decommissioned.
> The common usecase for decommissioning nodes for us is proactively exclude
> them before they went bad, so it would be great to get the blocks at risk
> onto the live datanodes as quickly as possible.
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