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https://issues.apache.org/jira/browse/HDFS-12140?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16088144#comment-16088144
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Hudson commented on HDFS-12140:
-------------------------------
SUCCESS: Integrated in Jenkins build Hadoop-trunk-Commit #12011 (See
[https://builds.apache.org/job/Hadoop-trunk-Commit/12011/])
HDFS-12140. Remove BPOfferService lock contention to get block pool id.
(kihwal: rev e7d187a1b6a826edd5bd0f708184d48f3674d489)
* (edit)
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/TestBPOfferService.java
* (edit)
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/BPOfferService.java
> 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
> Fix For: 2.9.0, 3.0.0-beta1, 2.8.3
>
> Attachments: HDFS-12140.branch-2.8.patch, 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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