cassandra-commits mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Brandon Williams (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 Tue, 10 Jan 2012 22:58:39 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-3722?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13183668#comment-13183668
] 

Brandon Williams commented on CASSANDRA-3722:
---------------------------------------------

The only way we could do this efficiently is via gossip which will have at best a latency
of one second to another (up to) 3 nodes, but asymptotically just one.  This is going to easily
take far longer to propagate through cluster than it will for the snitch to see the slow read
that affects the score enough to lower the remote node's read priority.
                
> 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.

--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa
For more information on JIRA, see: http://www.atlassian.com/software/jira

        

Mime
View raw message