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Posted to hdfs-dev@hadoop.apache.org by "Arpit Agarwal (JIRA)" <ji...@apache.org> on 2018/11/14 22:44:00 UTC
[jira] [Resolved] (HDFS-14072) DataNode runs async disk checks
maybe throws NullPointerException, and DataNode failed to register to
NameSpace.
[ https://issues.apache.org/jira/browse/HDFS-14072?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Arpit Agarwal resolved HDFS-14072.
----------------------------------
Resolution: Duplicate
Resolving as a dup since you have posted a patch on HDFS-14074.
> DataNode runs async disk checks maybe throws NullPointerException, and DataNode failed to register to NameSpace.
> ------------------------------------------------------------------------------------------------------------------
>
> Key: HDFS-14072
> URL: https://issues.apache.org/jira/browse/HDFS-14072
> 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
> Attachments: image-2018-11-13-20-23-22-138.png, image-2018-11-13-20-23-26-813.png
>
> 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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