[jira] [Commented] (ZOOKEEPER-2990) Implement probabilistic tracing

["Andor Molnar (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/ZOOKEEPER-2990?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16386133#comment-16386133 ] 

Andor Molnar commented on ZOOKEEPER-2990:
-----------------------------------------

[~bkanivets]

I strongly believe this will be a very useful new feature for ZooKeeper.

Looking forward to your contribution at GitHub.

 

Thanks!

> Implement probabilistic tracing
> -------------------------------
>
>                 Key: ZOOKEEPER-2990
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-2990
>             Project: ZooKeeper
>          Issue Type: Improvement
>          Components: server
>            Reporter: Bogdan Kanivets
>            Assignee: Bogdan Kanivets
>            Priority: Minor
>
> It would be nice to have an ability to do probabilistic tracing similar to Cassandra  [nodetool|https://docs.datastax.com/en/dse/5.1/dse-admin/datastax_enterprise/tools/nodetool/toolsSetTraceProbability.html]
> This will help debug issues in prod systems.
> I'd like to contribute if everyone is ok with the feature.
> My suggestion is to add an extra parameter to ZooTrace to handle it. Questions:
>  * should it be one global param or per each ZooTrace mask? I'm thinking per mask
>  * should it be a new 4lw or part of 'stmk'? Leaning towards new word and refactoring param passing to words (stmk is a special case right now).
>  * there are places in the code that use LOG.trace directly. That will have to change to ZooTrace
> I can make some initial implementation for demo/review.
>  



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