HA: close out operation categories
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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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