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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