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From "Eli Collins (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-1850) DN should transmit absolute failed volume count rather than increments to the NN
Date Wed, 20 Apr 2011 01:39:05 GMT
DN should transmit absolute failed volume count rather than increments to the NN
--------------------------------------------------------------------------------

                 Key: HDFS-1850
                 URL: https://issues.apache.org/jira/browse/HDFS-1850
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: data-node, name-node
            Reporter: Eli Collins
            Assignee: Eli Collins
             Fix For: 0.23.0


The API added in HDFS-811 for the DN to report volume failures to the NN is "inc(DN)". However
the given sequence of events will result in the NN forgetting about reported failed volumes:

# DN loses a volume and reports it
# NN restarts
# DN re-registers to the new NN

A more robust interface would be to have the DN report the total number of volume failures
to the NN each heart beat (the same way other volume state is transmitted).

This will likely be an incompatible change since it requires changing the Datanode protocol.

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