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From "Colin Patrick McCabe (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4824) FileInputStreamCache.close leaves dangling reference to FileInputStreamCache.cacheCleaner
Date Tue, 14 May 2013 22:31:17 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4824?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13657611#comment-13657611

Colin Patrick McCabe commented on HDFS-4824:

yeah, we definitely should be checking that return code.  I'm still confused about whether
we should be able to cancel via the runnable or not.  The types seem right, but there might
be some issues surrounding Runnables that wrap other Runnables... I will test.

It's better to cancel via the future anyway, I think.
> 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
> {{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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