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https://issues.apache.org/jira/browse/CASSANDRA-3722?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Brandon Williams updated CASSANDRA-3722:
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Attachment: 3722-v4.txt
I think requests pending just isn't a good measure, especially for a multi-dc
setup. Instead what we can do is penalize hosts based on the last time they
replied, with a cap of the update interval. This way, if we aren't querying
cross-dc, that dc is penalized, but within a reasonable limit such that if the
local reads get bad we'll exceed the threshold and go cross-dc if we have to.
This seems to respond much better to my torture test of force-suspending a JVM,
but not long enough for the FD to kick in.
> 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
> Attachments: 0001-CASSANDRA-3722-A1-V2.patch,
> 0001-CASSANDRA-3722-A1.patch, 0001-CASSANDRA-3722-v3.patch,
> 0001-CASSANDRA-3723-A2-Patch.patch,
> 0001-Expose-SP-latencies-in-nodetool-proxyhistograms.txt, 3722-v4.txt
>
>
> 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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