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From "Aaron T. Myers (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4816) transitionToActive blocks if the SBN is doing checkpoint image transfer
Date Wed, 14 Aug 2013 01:36:48 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4816?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13739135#comment-13739135
] 

Aaron T. Myers commented on HDFS-4816:
--------------------------------------

+1, the latest patch looks good to me.

I also checked with Todd offline and confirmed that he's good with the latest patch.

Thanks a lot, Andrew.
                
> transitionToActive blocks if the SBN is doing checkpoint image transfer
> -----------------------------------------------------------------------
>
>                 Key: HDFS-4816
>                 URL: https://issues.apache.org/jira/browse/HDFS-4816
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: namenode
>    Affects Versions: 3.0.0, 2.0.4-alpha
>            Reporter: Andrew Wang
>            Assignee: Andrew Wang
>         Attachments: hdfs-4816-1.patch, hdfs-4816-2.patch, hdfs-4816-3.patch, hdfs-4816-4.patch,
hdfs-4816-slow-shutdown.txt, stacks.out
>
>
> The NN and SBN do this dance during checkpoint image transfer with nested HTTP GETs via
{{HttpURLConnection}}. When an admin does a {{-transitionToActive}} during this transfer,
part of that is interrupting an ongoing checkpoint so we can transition immediately.
> However, the {{thread.interrupt()}} in {{StandbyCheckpointer#stop}} gets swallowed by
{{connection.getResponseCode()}} in {{TransferFsImage#doGetUrl}}. None of the methods in HttpURLConnection
throw InterruptedException, so we need to do something else (perhaps HttpClient [1]):
> [1]: http://hc.apache.org/httpclient-3.x/

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