Umesh Kumar Kumawat created HBASE-29323:
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Summary: Use Priority Handler for reportRegionStateTransition and
reportProcedureDone at Master
Key: HBASE-29323
URL: https://issues.apache.org/jira/browse/HBASE-29323
Project: HBase
Issue Type: Improvement
Components: master
Affects Versions: 2.6.2
Reporter: Umesh Kumar Kumawat
Assignee: Umesh Kumar Kumawat
There are two main reasons to use the Priority Handler:
# These reports are critical for completing region movements and ensuring
availability. Any delay in reporting can directly impact system availability.
# *Preventing Deadlocks During Region Server Draining:*
When draining a Region Server (RS), the {{MoveWithAck}} API is used. This API
waits for the {{TRSP}} (Transit Region State Procedure) to complete. During
this process, the Region Server calls {{reportRegionStateTransition}} after
opening or closing a region.
If multiple Region Servers are drained simultaneously, all general handler
threads can become occupied. This leaves no threads available to process
{{{}reportRegionStateTransition{}}}, resulting in a deadlock that blocks region
movements from completing.
Using a Priority Handler ensures that critical operations like state
transitions are not blocked by general handler saturation.
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