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https://issues.apache.org/jira/browse/HADOOP-10219?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16603222#comment-16603222
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Steve Loughran commented on HADOOP-10219:
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silence from others. So I've had a look again, and I don't see it being risky
+1
> ipc.Client.setupIOstreams() needs to check for ClientCache.stopClient
> requested shutdowns
> ------------------------------------------------------------------------------------------
>
> Key: HADOOP-10219
> URL: https://issues.apache.org/jira/browse/HADOOP-10219
> Project: Hadoop Common
> Issue Type: Bug
> Components: ipc
> Affects Versions: 2.2.0, 2.6.0
> Reporter: Steve Loughran
> Assignee: Kihwal Lee
> Priority: Major
> Attachments: HADOOP-10219.patch, HADOOP-10219.v1.patch,
> HADOOP-10219.v2.patch, HADOOP-10219.v3.patch, HADOOP-10219.v4.patch
>
>
> When {{ClientCache.stopClient()}} is called to stop the IPC client, if the
> client
> is blocked spinning due to a connectivity problem, it does not exit until
> the policy has timed out -so the stopClient() operation can hang for an
> extended period of time.
> This can surface in the shutdown hook of FileSystem.cache.closeAll()
> Also, Client.stop() is for used in NN switch from Standby to Active, and can
> therefore have very bad consequences and cause downtime.
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