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https://issues.apache.org/jira/browse/CASSANDRA-10323?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14908670#comment-14908670
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Robert Coli commented on CASSANDRA-10323:
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{quote}Robert Coli raised the good point that a very helpful metric for
operators would be to track MV lag, because mutations are applied to the view
from the base table asynchronously.{quote}
Probably this ends up being expressed as "queue depth" as opposed to actual
temporal lag, but "queue depth" provides useful visibility into "lag."
> Add more MaterializedView metrics
> ---------------------------------
>
> Key: CASSANDRA-10323
> URL: https://issues.apache.org/jira/browse/CASSANDRA-10323
> Project: Cassandra
> Issue Type: Improvement
> Reporter: T Jake Luciani
> Labels: lhf
> Fix For: 3.0.0 rc2
>
> Attachments: trunk-10323.txt
>
>
> We need to add more metrics to help understand where time is spent in
> materialized view writes. We currently track the ratio of async base -> view
> mutations that fail.
> We should also add
> * The amount of time spent waiting for the partition lock (contention)
> * The amount of time spent reading data
> Any others?
> [~carlyeks] [~jkni]
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