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https://issues.apache.org/jira/browse/HDFS-14073?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Arpit Agarwal resolved HDFS-14073.
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Resolution: Duplicate
> DataNode runs async disk checks maybe throws NullPointerException, and
> DataNode failed to register to NameSpace.
> ------------------------------------------------------------------------------------------------------------------
>
> Key: HDFS-14073
> URL: https://issues.apache.org/jira/browse/HDFS-14073
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: hdfs
> Affects Versions: 2.8.0, 3.0.0
> Environment: hadoop-2.7.3, hadoop-2.8.0
> Reporter: guangyi lu
> Priority: Major
> Labels: HDFS, HDFS-11114
> Original Estimate: 48h
> Remaining Estimate: 48h
>
> In ThrottledAsyncChecker class，it members of the completedChecks is
> WeakHashMap, its definition is as follows：
> this.completedChecks = new WeakHashMap<>();
> and one of its uses is as follows in schedule method:
> if (completedChecks.containsKey(target)) {
> // here may be happen garbage collection，and result may be null.
> final LastCheckResult<V> result = completedChecks.get(target);
> final long msSinceLastCheck = timer.monotonicNow() -
> result.completedAt;
> }
> after "completedChecks.containsKey(target)"， may be happen garbage
> collection， and result may be null.
>
> !image-2018-11-13-20-23-26-813.png!
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