[HBASE-26807] Unify CallQueueTooBigException special pause with CallDroppedException

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 2.5.0, 3.0.0-alpha-3
• Labels: patch-available

Release Note

Introduces a new config "hbase.client.pause.server.overloaded", deprecating old "hbase.client.pause.cqtbe". The new config specifies a special pause time to use when the client receives an exception from the server indicating that it is overloaded. Currently this applies to CallQueueTooBigException and CallDroppedException.

• Assignee: Bryan Beaudreault
• Reporter: Bryan Beaudreault
• Created: 07/Mar/22 14:14
• Updated: 26/Apr/22 18:25
• Resolved: 25/Apr/22 17:28

Description

CallQueueTooBigException and CallDroppedException crop up in very similar circumstances – the former is thrown if the request cannot be enqueued because the queue is full; the latter is thrown when a call is dropped from the queue to make room for another call.

HBASE-17114 added a special pause feature, which allows pausing for a longer period of time when CallQueueTooBigException is encountered, vs the normal pause for other exceptions. The idea here is to help reduce load so the server can process its queue. We should extend this feature to encompass CallDroppedException for the same reason.

Currently the config is called "hbase.client.pause.cqtbe". We should probably deprecate that in favor of a more generic name.

Issue Links

• blocks: HBASE-26809 Report client backoff time for server overloaded in ConnectionMetrics
• fixes: HBASE-26973 Adhere to maxAttempts in RawAsyncTableImpl.batch
• links to: GitHub Pull Request #4180
• links to: GitHub Pull Request #4273
• links to: GitHub Pull Request #4370