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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4824) FileInputStreamCache.close leaves dangling reference to FileInputStreamCache.cacheCleaner
Date Fri, 17 May 2013 13:37:19 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4824?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13660715#comment-13660715
] 

Hudson commented on HDFS-4824:
------------------------------

Integrated in Hadoop-Mapreduce-trunk #1428 (See [https://builds.apache.org/job/Hadoop-Mapreduce-trunk/1428/])
    HDFS-4824. FileInputStreamCache.close leaves dangling reference to FileInputStreamCache.cacheCleaner.
Contributed by Colin Patrick McCabe. (Revision 1483641)

     Result = FAILURE
todd : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1483641
Files : 
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/FileInputStreamCache.java

                
> FileInputStreamCache.close leaves dangling reference to FileInputStreamCache.cacheCleaner
> -----------------------------------------------------------------------------------------
>
>                 Key: HDFS-4824
>                 URL: https://issues.apache.org/jira/browse/HDFS-4824
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: hdfs-client
>    Affects Versions: 2.0.4-alpha
>            Reporter: Henry Robinson
>            Assignee: Colin Patrick McCabe
>             Fix For: 3.0.0, 2.0.5-beta
>
>         Attachments: HDFS-4824.001.patch, HDFS-4824.002.patch
>
>
> {{FileInputStreamCache}} leaves around a reference to its {{cacheCleaner}} after {{close()}}.
> The {{cacheCleaner}} is created like this:
> {code}
> if (cacheCleaner == null) {
>           cacheCleaner = new CacheCleaner();
>           executor.scheduleAtFixedRate(cacheCleaner, expiryTimeMs, expiryTimeMs,
>               TimeUnit.MILLISECONDS);
>         }
> {code}
> and supposedly removed like this:
> {code}
> if (cacheCleaner != null) {
>   executor.remove(cacheCleaner);
> }
> {code}
> However, {{ScheduledThreadPoolExecutor.remove}} returns a success boolean which should
be checked. And I _think_ from a quick read of that class that the return value of {{scheduleAtFixedRate}}
should be used as the argument to {{remove}}. 

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