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From "Andrew Wang (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-7715) FSUtils#waitOnSafeMode can incorrectly loop on standby NN
Date Wed, 30 Jan 2013 00:31:12 GMT
Andrew Wang created HBASE-7715:

             Summary: FSUtils#waitOnSafeMode can incorrectly loop on standby NN
                 Key: HBASE-7715
                 URL: https://issues.apache.org/jira/browse/HBASE-7715
             Project: HBase
          Issue Type: Bug
    Affects Versions: 0.94.4
            Reporter: Andrew Wang
            Assignee: Andrew Wang

We encountered an issue where HMaster failed to start with an active NN not in safe mode and
a standby NN in safemode. The relevant lines in {{FSUtils.java}} show the issue:

    while (dfs.setSafeMode(org.apache.hadoop.hdfs.protocol.FSConstants.SafeModeAction.SAFEMODE_GET))

This call skips the normal client failover from the standby to active NN, so it will loop
polling the standby NN if it unfortunately talks to the standby first.

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