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From "Wei-Chiu Chuang (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (HDFS-14074) DataNode runs async disk checks maybe throws NullPointerException, and DataNode failed to register to NameSpace.
Date Sat, 22 Jun 2019 01:29:00 GMT

     [ https://issues.apache.org/jira/browse/HDFS-14074?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Wei-Chiu Chuang reassigned HDFS-14074:
--------------------------------------

    Assignee: guangyi lu

> DataNode runs async disk checks  maybe  throws NullPointerException, and DataNode failed
to register to NameSpace.
> ------------------------------------------------------------------------------------------------------------------
>
>                 Key: HDFS-14074
>                 URL: https://issues.apache.org/jira/browse/HDFS-14074
>             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
>            Assignee: guangyi lu
>            Priority: Major
>              Labels: HDFS, HDFS-11114
>             Fix For: 2.8.0, 2.7.3, 3.0.0
>
>         Attachments: HDFS-14074-latest.patch, HDFS-14074.patch, WechatIMG83.jpeg
>
>   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.
> the solution is:
> this.completedChecks = new ReferenceMap(1, 1);
> or
>  this.completedChecks = new HashMap<>();
>  



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