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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4816) transitionToActive blocks if the SBN is doing checkpoint image transfer
Date Thu, 15 Aug 2013 14:48:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4816?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13741014#comment-13741014
] 

Hudson commented on HDFS-4816:
------------------------------

FAILURE: Integrated in Hadoop-Mapreduce-trunk #1519 (See [https://builds.apache.org/job/Hadoop-Mapreduce-trunk/1519/])
HDFS-4816. transitionToActive blocks if the SBN is doing checkpoint image transfer. (Andrew
Wang) (wang: http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1514095)
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/ha/StandbyCheckpointer.java
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/ha/TestStandbyCheckpoints.java

                
> 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
>             Fix For: 2.3.0
>
>         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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