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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-3862) QJM: don't require a fencer to be configured if shared storage has built-in single-writer semantics
Date Tue, 28 Aug 2012 20:47:08 GMT
Todd Lipcon created HDFS-3862:
---------------------------------

             Summary: QJM: don't require a fencer to be configured if shared storage has built-in
single-writer semantics
                 Key: HDFS-3862
                 URL: https://issues.apache.org/jira/browse/HDFS-3862
             Project: Hadoop HDFS
          Issue Type: Sub-task
          Components: ha
    Affects Versions: QuorumJournalManager (HDFS-3077)
            Reporter: Todd Lipcon


Currently, NN HA requires that the administrator configure a fencing method to ensure that
only a single NameNode may write to the shared storage at a time. Some shared edits storage
implementations (like QJM) inherently enforce single-writer semantics at the storage level,
and thus the user should not be forced to specify one.

We should extend the JournalManager interface so that the HA code can operate without a configured
fencer if the JM has such built-in fencing.

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