[jira] [Reopened] (CASSANDRA-13234) Add histogram for delay to deliver hints

["Jeff Jirsa (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CASSANDRA-13234?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jeff Jirsa reopened CASSANDRA-13234:
------------------------------------

Reopening - [~aweisberg] correctly notes that there's a (likely rare) edge case where FD thinks the host is up, we try to replay hints, hint replay fails, but we update metrics incorrectly anyway.

Submitting a modification where we update the hint delay histograms in the response callback, rather than before sending, just in case the hint dispatch fails.

[~spodxx@gmail.com] or [~aweisberg] - either of you care to review the modification (pushed to the same trunk cassandra-13234 branch above). 

> Add histogram for delay to deliver hints
> ----------------------------------------
>
>                 Key: CASSANDRA-13234
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-13234
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Observability
>            Reporter: Jeff Jirsa
>            Assignee: Jeff Jirsa
>            Priority: Minor
>             Fix For: 4.0
>
>
> There is very little visibility into hint delivery in general - having histograms available to understand how long it takes to deliver hints is useful for operators to better identify problems. 



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