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https://issues.apache.org/jira/browse/HDFS-10987?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Brahma Reddy Battula updated HDFS-10987:
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Attachment: HDFS-10987-branch-2.7.patch
Uploading the branch-2.7 patch.Kindly Review.
> Make Decommission less expensive when lot of blocks present.
> ------------------------------------------------------------
>
> Key: HDFS-10987
> URL: https://issues.apache.org/jira/browse/HDFS-10987
> Project: Hadoop HDFS
> Issue Type: Bug
> Reporter: Brahma Reddy Battula
> Assignee: Brahma Reddy Battula
> Priority: Critical
> Labels: release-blocker
> Fix For: 2.8.0, 3.0.0-alpha2
>
> Attachments: HDFS-10987-002.patch, HDFS-10987-branch-2.7.patch,
> HDFS-10987.patch
>
>
> When user want to decommission a node which having 50M blocks +,it could hold
> the namesystem lock for long time.We've seen it is taking 36 sec+.
> As we knew during this time, Namenode will not available... As this
> decommission will continuosly run till all the blocks got replicated,hence
> Namenode will unavailable.
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