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Benedict Elliott Smith edited comment on CASSANDRA-14731 at 11/5/19 1:54 PM:
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Hi [~abdulazizali]. Sure, you're welcome to take this ticket. It's a while
since I thought about this, so I will have to acclimatise to the context again,
but there appear to be two proposals in this ticket: 1) tracking those
transient writes we perform _because of the failure detector,_ and these are
going to happen in {{sendToHintedReplicas}}; 2) tracking success of a transient
write, particularly for achieving the requested consistency level, and that
would happen in {{AbstractWriteResponseHandler}} but, in retrospect, I'm not
entirely sure what this would look like.
was (Author: benedict):
Hi [~abdulazizali]. Sure, you're welcome to take this ticket. It's a while
since I thought about this, so I will have to acclimatise to the context again,
but there appear to be two proposals in this ticket: 1) tracking those
transient writes we perform _because of the failure detector,_ and these are
going to happen in {{sendToHintedReplicas}}. If we want to track success of
transient writes for achieving quorum, that would happen in
{{AbstractWriteResponseHandler}} but, in retrospect, I'm not entirely sure what
this would look like.
> Transient Write Metrics
> -----------------------
>
> Key: CASSANDRA-14731
> URL: https://issues.apache.org/jira/browse/CASSANDRA-14731
> Project: Cassandra
> Issue Type: Improvement
> Components: Legacy/Core, Observability/Metrics
> Reporter: Benedict Elliott Smith
> Assignee: Abdul Aziz Ali
> Priority: Low
> Labels: metrics, transient-replication
> Fix For: 4.x
>
>
> While we record the number of attempt transient writes, we do not record how
> successful these were.
> Also, we do not count transient writes that happen due to the failure
> detector. While these are distinct from those writes that happen
> ‘speculatively’ due to slow responses, there’s a strong chance they will be
> the most common form of transient write. It might be worth having separate
> metrics.
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