Jimmy Xiang created HBASE-9184:
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Summary: Ignore zk assign event if region is not known in
transition
Key: HBASE-9184
URL: https://issues.apache.org/jira/browse/HBASE-9184
Project: HBase
Issue Type: Bug
Components: Region Assignment
Reporter: Jimmy Xiang
Assignee: Jimmy Xiang
This is a follow up of HBASE-9161. Currently, if a region is in transition, we
ignore any unexpected zk assign event and log a warning. For example, a zk
closing event will be ignored if the region is pending open actually. However,
if the region is not in transition, we will accept such events. For events not
related to split/merge, we should ignore them and log a warning too, to tighten
up the region state transition. During normal operation, this (ensuring region
is in transition before accepting transition related events) is fine. During
master failover, this is fine as long as we don't do region transition bypass
ZK. We should also make sure to watch assignment znodes after user region
states are recovered, so that we don't log many such warnings.
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