[jira] [Commented] (KUDU-3148) Add Java client metrics

["Grant Henke (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/KUDU-3148?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17134336#comment-17134336 ] 

Grant Henke commented on KUDU-3148:
-----------------------------------

I need this functionality to help observability/validation for testing KUDU-1802/KUDU-3135. Breaking this improvement into a few steps could look like:
# Add the base functionality along with a few metrics for tests only (disabled by default)
# Add more complete metric coverage and testing
# Enable JMX support and optional periodic logging of metrics
# With extensive real-world testing consider enabling by default

> Add Java client metrics
> -----------------------
>
>                 Key: KUDU-3148
>                 URL: https://issues.apache.org/jira/browse/KUDU-3148
>             Project: Kudu
>          Issue Type: Improvement
>          Components: client
>    Affects Versions: 1.12.0
>            Reporter: Grant Henke
>            Assignee: Grant Henke
>            Priority: Major
>              Labels: supportability
>
> This Jira is to track adding complete metrics to the Java client. There are many cases where applications using the client have issues that are difficult to debug. The primary reason is that it's hard to reason about what the application is doing with the Kudu client without inspecting the code, and even then it can be easy to miss an issue in the code as well. 
> For example we have seen many cases where an application creates a Kudu client, sends a few messages, and then closes the client in a loop. Creating many clients over an over not only impacts performance/stability of the application but can also put unwelcome load on the servers. If we had request metrics with a client id tag periodically logged, then it would be easy to grep the application logs for unique client ids and spot the issue and the offending application.



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