[ZOOKEEPER-2359] ZooKeeper client has unnecessary logs for watcher removal errors

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.5.1
• Fix Version/s: 3.5.4, 3.6.0
• Component/s: java client
• Assignee: Jordan Zimmerman
• Reporter: Jordan Zimmerman
• Created: 04/Feb/16 13:30
• Updated: 27/May/19 08:17
• Resolved: 01/Jun/17 16:38

Description

ClientCnxn.java logs errors during watcher removal:

LOG.error("Failed to find watcher!", nwe);
LOG.error("Exception when removing watcher", ke);

An error code/exception is generated so the logs are noisy and unnecessary. If the client handles the error there's still a log message. This is different than other APIs. These logs should be removed.