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From "Jonathan Ellis (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-3722) Send Hints to Dynamic Snitch when Compaction or repair is going on for a node.
Date Thu, 12 Jan 2012 20:42:42 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-3722?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13185217#comment-13185217
] 

Jonathan Ellis commented on CASSANDRA-3722:
-------------------------------------------

bq. the problem with that is that until we send the traffic actual traffic to the suspected
node we will not know it

Right, so I'm saying instead of gossiping an indirect indicator like compaction status, we
could gossip read latency directly.
                
> 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
>            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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