John L. Singleton commented on ZOOKEEPER-912:

If I could weigh in on this one too: 

"What's your rule of thumb for what should be logged at the various levels?"


WARN: Recoverable errors
ERROR: Non-recoverable errors
INFO: Non error conditions pertaining operation, eg, for a SERVER side program, 
tell me that someone connected, but don't give me all the details about session 
establishment, etc. For a CLIENT side program, all these details should be 
TRACE:  Information used for extended debugging, suitable for 
DEBUG: Information used for basic debugging, suitable for end users 

> ZooKeeper client logs trace and debug messages at level INFO
> ------------------------------------------------------------
>                 Key: ZOOKEEPER-912
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-912
>             Project: Zookeeper
>          Issue Type: Improvement
>          Components: java client
>    Affects Versions: 3.3.1
>            Reporter: Anthony Urso
>            Assignee: Anthony Urso
>            Priority: Minor
>             Fix For: 3.4.0
>         Attachments: zk-loglevel.patch
> ZK logs a lot of uninformative trace and debug messages to level INFO.  This 
> fuzzes up everything and makes it easy to miss useful log info. 

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