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From "Steve Loughran (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-10219) ipc.Client.setupIOstreams() needs to check for ClientCache.stopClient requested shutdowns
Date Fri, 31 Aug 2018 09:43:00 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-10219?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16598495#comment-16598495

Steve Loughran commented on HADOOP-10219:

I see the ping, see the value of getting this in. Sent an email out to common & hdfs dev
asking for more reviewers. If we don't get that, I'll do some more detailed reviewing myself
(which includes learning more about that module, ideally some more testing)

> 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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