Virag Kothari created HBASE-11659:
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Summary: Region state RPC call is not idempotent
Key: HBASE-11659
URL: https://issues.apache.org/jira/browse/HBASE-11659
Project: HBase
Issue Type: Bug
Components: Region Assignment
Reporter: Virag Kothari
Assignee: Virag Kothari
Here is the scenario on 0.98 with zk-less assignment
The master gets an OPEN RPC call from region server.
So, it moves the region state from PENDING_OPEN to OPEN.
But, the call timeouts on the region server and region server retries sending
the OPEN call. However, now the master throws an Exception saying the region is
not PENDING_OPEN. So, the region servers aborts the region on receiving that
exception and sends FAILED_OPEN to master. But the master cannot change its
state from FAILED_OPEN to OPEN, so eventually the master keeps the state as
OPEN while the actual region is no longer open on region server.
The master should not throw an exception on receiving OPEN RPC calls multiple
times.
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