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https://issues.apache.org/jira/browse/HBASE-19954?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16369635#comment-16369635
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Ted Yu commented on HBASE-19954:
--------------------------------

In the @After method of TestBlockReorder, shutdownMiniCluster() is called.
Clearing shutdown hooks came from this patch:
https://issues.apache.org/jira/secure/attachment/12751805/HDFS-8838-HDFS-7285-20150821.patch#file-6

whose parent JIRA, HDFS-7285, was incorporated into hadoop3.

In patch v3, I separate the 3 subtests into 3 tests since they use different 
replication count.
I ran the tests locally, including the new files, which passed.

> ShutdownHook should check whether shutdown hook is tracked by 
> ShutdownHookManager
> ---------------------------------------------------------------------------------
>
>                 Key: HBASE-19954
>                 URL: https://issues.apache.org/jira/browse/HBASE-19954
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Ted Yu
>            Assignee: Ted Yu
>            Priority: Major
>             Fix For: 2.0.0-beta-2
>
>         Attachments: 19954.v1.txt, 19954.v2.txt, 19954.v3.txt
>
>
> Currently ShutdownHook#suppressHdfsShutdownHook() does the following:
> {code}
>       synchronized (fsShutdownHooks) {
>         boolean isFSCacheDisabled = 
> fs.getConf().getBoolean("fs.hdfs.impl.disable.cache", false);
>         if (!isFSCacheDisabled && 
> !fsShutdownHooks.containsKey(hdfsClientFinalizer)
>             && !ShutdownHookManager.deleteShutdownHook(hdfsClientFinalizer)) {
> {code}
> There is no check that ShutdownHookManager still tracks the shutdown hook, 
> leading to potential RuntimeException (as can be observed in hadoop3 Jenkins 
> job).



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