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https://issues.apache.org/jira/browse/HDFS-14523?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16909521#comment-16909521
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Hudson commented on HDFS-14523:
-------------------------------
FAILURE: Integrated in Jenkins build Hadoop-trunk-Commit #17138 (See
[https://builds.apache.org/job/Hadoop-trunk-Commit/17138/])
HDFS-14523. Remove excess read lock for NetworkToplogy. Contributed by
(weichiu: rev 971a4c8e8328a4bdea65de4a0e84c82b5b2de24b)
* (edit)
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/net/NetworkTopology.java
> Remove excess read lock for NetworkToplogy
> ------------------------------------------
>
> Key: HDFS-14523
> URL: https://issues.apache.org/jira/browse/HDFS-14523
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: Wu Weiwei
> Assignee: Wu Weiwei
> Priority: Major
> Fix For: 3.3.0
>
> Attachments: HDFS-14523.1.patch
>
>
> getNumOfRacks() and getNumOfLeaves() are two high frequencies call methods
> for BlockPlacementPolicy, this two methods need to get NetworkTopology read
> lock, and get lock in high frequencies call methods may impact the namenode
> performance.
> This two methods get number of racks and number of leaves just for
> chooseTarget calculate, lock in these two methods cannot guarantee these two
> values will not change in the subsequent calculations.
> I think it's safe to remove the read lock from this two methods.
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