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From "Daryn Sharp (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-12140) Remove BPOfferService lock contention to get block pool id
Date Fri, 14 Jul 2017 15:06:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-12140?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16087437#comment-16087437
] 

Daryn Sharp commented on HDFS-12140:
------------------------------------

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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