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From "Eli Collins (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-2922) HA: close out operation categories
Date Thu, 09 Feb 2012 05:08:00 GMT
HA: close out operation categories
----------------------------------

                 Key: HDFS-2922
                 URL: https://issues.apache.org/jira/browse/HDFS-2922
             Project: Hadoop HDFS
          Issue Type: Sub-task
          Components: ha
    Affects Versions: HA branch (HDFS-1623)
            Reporter: Eli Collins
            Assignee: Eli Collins


We need to close out the NN operations categories.

The following operations should be left as is, ie not failover, as it's reasonable to call
these on a standby, and we just need to update the TODO with a comment:
- {{setSafeMode}} (Might want to force the standby out of safemode)
- {{restoreFailedStorage}} (Might want to tell the standby to restore the shared edits dir)
- {{saveNamespace}}, {{metaSave}} (Could imagine calling these on a standby eg in a recovery
scenario)
- {{refreshNodes}} (Decommissioning needs to refresh the standby)

The following operations should be checked for READ, as neither should need to be called on
standby, will failover unless stale reads are enabled:
- {{getTransactionID}}, {{getEditLogManifest}} (we don't checkoint the standby)

The following operations should be checked for WRITE, as they should not be called on a standby,
ie should always failover:
- {{finalizeUpgrade}}, {{distributedUpgradeProgress}} (should not be able to upgrade the standby)
- {{setBalancerBandwidth}} (balancer should failover)

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