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https://issues.apache.org/jira/browse/HDFS-4816?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andrew Wang updated HDFS-4816:
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Attachment: hdfs-4816-1.patch
Here's a patch making it into a thread. I've tested this manually with a
pseudo-distributed HA cluster, and am able to transition from standby to active
without blocking on the transfer.
Making a unit test for this is proving difficult. Posting it up for now sans
test.
> 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
> Attachments: hdfs-4816-1.patch
>
>
> 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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