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https://issues.apache.org/jira/browse/CASSANDRA-3722?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13219639#comment-13219639
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Pavel Yaskevich commented on CASSANDRA-3722:
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Also maintaining a kind of normalized load statistics for each node in the
combination with pending requests could give a better view of what is going on
on the node e.g. load is <= 0.5 but we have a big pending queue for/on the node
- that could mean network failure. For the statistic we can assign each of the
sub-routines "load impact" factor e.g. compaction 0.3, scrub - 0.2, read -
0.01, we can set the load threshold for "overloaded" nodes e.g. 0.85 (which
could be adjusted at runtime) and sort hosts accordingly to their load +
pending request statistics which would make penalizing hosts more precise.
Obviously some normalization should be done because clusters won't always have
nodes with identical processing capabilities (network, hardware etc.).
> Send Hints to Dynamic Snitch when Compaction or repair is going on for a node.
> ------------------------------------------------------------------------------
>
> Key: CASSANDRA-3722
> URL: https://issues.apache.org/jira/browse/CASSANDRA-3722
> Project: Cassandra
> Issue Type: Improvement
> Components: Core
> Affects Versions: 1.1.0
> Reporter: Vijay
> Assignee: Vijay
> Priority: Minor
>
> Currently Dynamic snitch looks at the latency for figuring out which node
> will be better serving the requests, this works great but there is a part of
> the traffic sent to collect this data... There is also a window when Snitch
> doesn't know about some major event which are going to happen on the node
> (Node which is going to receive the data request).
> It would be great if we can send some sort hints to the Snitch so they can
> score based on known events causing higher latencies.
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