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https://issues.apache.org/jira/browse/HDFS-4075?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kihwal Lee updated HDFS-4075:
-----------------------------
Attachment: hdfs-4075.patch
I excluded the logging change since HDFS-4080 will take care of it. The patch
lets the recommissioning skip the over-replication check for dead nodes and
logs the total number overreplicated blocks per node.
I expect the future lock improvement will reduce the duration of namespace
write locking.
> Reduce recommissioning overhead
> -------------------------------
>
> Key: HDFS-4075
> URL: https://issues.apache.org/jira/browse/HDFS-4075
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: name-node
> Affects Versions: 0.23.4, 2.0.2-alpha
> Reporter: Kihwal Lee
> Assignee: Kihwal Lee
> Priority: Critical
> Attachments: hdfs-4075.patch, hdfs-4075.patch
>
>
> When datanodes are recommissioned,
> {BlockManager#processOverReplicatedBlocksOnReCommission()} is called for each
> rejoined node and excess blocks are added to the invalidate list. The problem
> is this is done while the namesystem write lock is held.
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