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https://issues.apache.org/jira/browse/HBASE-19954?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16369649#comment-16369649
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Ted Yu commented on HBASE-19954:
--------------------------------
Mike:
I re-read HBASE-17922.
See my comment above on which patch added the shutdown hook clearing.
> 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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