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From "Todd Lipcon (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-2693) Synchronization issues around state transition
Date Thu, 15 Dec 2011 23:19:30 GMT
Synchronization issues around state transition
----------------------------------------------

                 Key: HDFS-2693
                 URL: https://issues.apache.org/jira/browse/HDFS-2693
             Project: Hadoop HDFS
          Issue Type: Sub-task
          Components: ha, name-node
    Affects Versions: HA branch (HDFS-1623)
            Reporter: Todd Lipcon
            Priority: Critical


Currently when the NN changes state, it does so without synchronization. In particular, the
state transition function does:
(1) leave old state
(2) change state variable
(3) enter new state

This means that the NN is marked as "active" before it has actually transitioned to active
mode and opened its edit logs. This gives a window where write transactions can come in and
the {{checkOperation}} allows them, but then they fail because the edit log is not yet opened.

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