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https://issues.apache.org/jira/browse/HDFS-4887?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13696863#comment-13696863
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Kihwal Lee commented on HDFS-4887:
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bq. For the new patch, do we need to declare checkNSRunning as volatile, since
it can be set and retrieved by different threads?
The replication monitor thread accesses this variable only once when
terminating, so there will be no issue.
> TestNNThroughputBenchmark exits abruptly
> ----------------------------------------
>
> Key: HDFS-4887
> URL: https://issues.apache.org/jira/browse/HDFS-4887
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: benchmarks, test
> Affects Versions: 3.0.0, 2.1.0-beta
> Reporter: Kihwal Lee
> Assignee: Kihwal Lee
> Attachments: HDFS-4887.patch, HDFS-4887.patch
>
>
> After HDFS-4840, TestNNThroughputBenchmark exits in the middle. This is
> because ReplicationMonitor is being stopped while NN is still running.
> This is only valid during testing. In normal cases, ReplicationMonitor thread
> runs all the time once started. In standby or safemode, it just skips
> calculating DN work. I think NNThroughputBenchmark needs to use ExitUtil to
> prevent termination, rather than modifying ReplicationMonitor.
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