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From "Tsz Wo Nicholas Sze (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-7230) Support rolling downgrade
Date Fri, 10 Oct 2014 19:45:35 GMT
Tsz Wo Nicholas Sze created HDFS-7230:
-----------------------------------------

             Summary: Support rolling downgrade
                 Key: HDFS-7230
                 URL: https://issues.apache.org/jira/browse/HDFS-7230
             Project: Hadoop HDFS
          Issue Type: Improvement
            Reporter: Tsz Wo Nicholas Sze
            Assignee: Tsz Wo Nicholas Sze


HDFS-5535 made a lot of improvement on rolling upgrade.  It also added the cluster downgrade
feature.  However, the downgrade described in HDFS-5535 requires cluster downtime.  In this
JIRA, we discuss how to do rolling downgrade, i.e. downgrade without downtime.



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