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https://issues.apache.org/jira/browse/HDFS-15634?focusedWorklogId=501431&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-501431
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ASF GitHub Bot logged work on HDFS-15634:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 16/Oct/20 06:05
Start Date: 16/Oct/20 06:05
Worklog Time Spent: 10m
Work Description: fengnanli commented on pull request #2388:
URL: https://github.com/apache/hadoop/pull/2388#issuecomment-709817743
Will put another patch with UT soon
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Issue Time Tracking
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Worklog Id: (was: 501431)
Time Spent: 1h (was: 50m)
> Invalidate block on decommissioning DataNode after replication
> --------------------------------------------------------------
>
> Key: HDFS-15634
> URL: https://issues.apache.org/jira/browse/HDFS-15634
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: hdfs
> Reporter: Fengnan Li
> Assignee: Fengnan Li
> Priority: Major
> Labels: pull-request-available
> Time Spent: 1h
> Remaining Estimate: 0h
>
> Right now when a DataNode starts decommission, Namenode will mark it as
> decommissioning and its blocks will be replicated over to different
> DataNodes, then marked as decommissioned. These blocks are not touched since
> they are not counted as live replicas.
> Proposal: Invalidate these blocks once they are replicated and there are
> enough live replicas in the cluster.
> Reason: A recent shutdown of decommissioned datanodes to finished the flow
> caused Namenode latency spike since namenode needs to remove all of the
> blocks from its memory and this step requires holding write lock. If we have
> gradually invalidated these blocks the deletion will be much easier and
> faster.
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