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From "Andrew Wang (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-4816) transitionToActive blocks if the SBN is doing checkpoint image transfer
Date Sat, 11 May 2013 00:27:15 GMT
Andrew Wang created HDFS-4816:
---------------------------------

             Summary: 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: 2.0.4-alpha, 3.0.0
            Reporter: Andrew Wang


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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