Robert Kanter created OOZIE-1564:
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Summary: Metadata for dead Oozie servers should remain in ZK
Key: OOZIE-1564
URL: https://issues.apache.org/jira/browse/OOZIE-1564
Project: Oozie
Issue Type: Improvement
Components: HA
Affects Versions: trunk
Reporter: Robert Kanter
Assignee: Robert Kanter
As per the discussion in OOZIE-1561, we should have two services in the service
discovery on ZK:
# Contains the metadata for any Oozie server that has ever connected, even ones
that are currently dead
#- This would be used by log streaming so that dead servers are always
identified
#- I think there is an easy way to do this with a setting in Curator, but I
have to test it. If not, then we'll have to manually create/manage the ZNodes.
# Contains the metadata for any Oozie server that is still alive (the current
behavior)
#- This would be used by the mod calculation so only alive servers are included
Maintaining two lists will avoid the need to do any pinging or tricky
heartbeating.
We'd have to add a new admin command to cleanup the dead servers. It would
look at which servers are not in the alive list and remove those.
It would also be good to update the admin command that lists servers to specify
which ones are alive and which are dead; and possibly have filtering (i.e. show
only alive servers, show only dead servers, show all servers)
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