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From "Owen O'Malley (JIRA)" <j...@apache.org>
Subject [jira] Created: (HDFS-779) Automatic move to safe-mode when cluster size drops
Date Thu, 19 Nov 2009 18:49:39 GMT
Automatic move to safe-mode when cluster size drops
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                 Key: HDFS-779
                 URL: https://issues.apache.org/jira/browse/HDFS-779
             Project: Hadoop HDFS
          Issue Type: New Feature
          Components: name-node
            Reporter: Owen O'Malley


As part of looking at using Kerberos, we want to avoid the case where both the primary (and
optional secondary) KDC go offline causing a replication storm as the DataNodes' service tickets
time out and they lose the ability to connect to the NameNode. However, this is a specific
case of a more general problem of loosing too many nodes too quickly. I think we should have
an option to go into safe mode if the cluster size goes down more than N% in terms of DataNodes.

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