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https://issues.apache.org/jira/browse/HDFS-10743?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16201168#comment-16201168
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Subru Krishnan commented on HDFS-10743:
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Pushing it out from 2.9.0 due to lack of recent activity. Feel free to revert
if required.
> MiniDFSCluster test runtimes can be drastically reduce
> ------------------------------------------------------
>
> Key: HDFS-10743
> URL: https://issues.apache.org/jira/browse/HDFS-10743
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: hdfs
> Affects Versions: 2.0.0-alpha
> Reporter: Daryn Sharp
> Assignee: Kuhu Shukla
> Attachments: HDFS-10743.001.patch, HDFS-10743.002.patch,
> HDFS-10743.003.patch
>
>
> {{MiniDFSCluster}} tests have excessive runtimes. The main problem appears
> to be the heartbeat interval. The NN may have to wait up to 3s (default
> value) for all DNs to heartbeat, triggering registration, so NN can go
> active. Tests that repeatedly restart the NN are severely affected.
> Example for varying heartbeat intervals for {{TestFSImageWithAcl}}:
> * 3s = ~70s -- (disgusting, why I investigated)
> * 1s = ~27s
> * 500ms = ~17s -- (had to hack DNConf for millisecond precision)
> That a 4x improvement in runtime.
> 17s is still excessively long for what the test does. Further areas to
> explore when running tests:
> * Reduce numerous sleeps intervals in DN's {{BPServiceActor}}.
> * Ensure heartbeats and initial BR are sent immediately upon (re)registration.
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