Charles Connell created HBASE-29682:
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Summary: Admin#flushMasterStore() should roll the HMaster WAL
Key: HBASE-29682
URL: https://issues.apache.org/jira/browse/HBASE-29682
Project: HBase
Issue Type: Improvement
Reporter: Charles Connell
Assignee: Charles Connell
I argue that in addition to flushing the master region, the flushMasterStore()
RPC should also roll the WAL files being written by the HMaster.
In clusters with small numbers of DataNodes (less than 9, in my experience), a
rolling restart of the DataNodes will break WAL writers, in both HMasters and
RegionServers. This can be worked around on RegionServers by calling
{{admin.rollWALWriter()}} on every RegionServer after restarting each DataNode.
Currently, there is no equivalent way to do this to an HMaster. I think the
most elegant solution is to augment {{admin.flushMasterStore()}}.
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