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https://issues.apache.org/jira/browse/HDFS-12140?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16087437#comment-16087437
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Daryn Sharp commented on HDFS-12140:
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Also avoids a silly double fetch/penalty for a precondition's error message!
> Remove BPOfferService lock contention to get block pool id
> ----------------------------------------------------------
>
> Key: HDFS-12140
> URL: https://issues.apache.org/jira/browse/HDFS-12140
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: datanode
> Affects Versions: 2.8.0
> Reporter: Daryn Sharp
> Assignee: Daryn Sharp
> Priority: Critical
> Attachments: HDFS-12140.trunk.patch
>
>
> The block pool id is protected by a lock in {{BPOfferService}}. This creates
> excessive contention especially for xceivers threads attempting to queue IBRs
> and heartbeat processing. When the latter is delayed due to excessive
> FSDataset lock contention, it causes pipelines to collapse.
> Accessing the block pool id should be lockless after registration.
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