[ZOOKEEPER-4508] ZooKeeper client run to endless loop in ClientCnxn.SendThread.run if all server down

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.6.3, 3.7.0, 3.8.0
• Fix Version/s: 3.10.0, 3.9.3
• Component/s: java client
• Labels: pull-request-available
• Assignee: Kezhu Wang
• Reporter: Kezhu Wang
• Created: 01/Apr/22 07:37
• Updated: 24/Oct/24 20:09
• Resolved: 23/Sep/24 22:27

Description

The observable behavior is that client will not get expired event from watcher. The cause if twofold:
1. `updateLastSendAndHeard` is called in reconnection so the session timeout don't decrease.
2. There is not break out from `ClientCnxn.SendThread.run` after session timeout.

Issue Links

• is duplicated by: ZOOKEEPER-4692 Handle SessionTimeoutException in Java client
• supercedes: ZOOKEEPER-4412 client blocked too long before session timeout
• supercedes: ZOOKEEPER-1159 ClientCnxn does not propagate session expiration indication
• supercedes: ZOOKEEPER-2188 client connection hung up because of dead loop
• links to: [PROPOSAL] Timeout to expire session in client side to avoid endless connection loss
• links to: GitHub Pull Request #1847
• links to: GitHub Pull Request #2058