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From "Stu Hood (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-2364) Record dynamic snitch latencies for counter writes
Date Tue, 22 Mar 2011 20:06:05 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-2364?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13009817#comment-13009817
] 

Stu Hood commented on CASSANDRA-2364:
-------------------------------------

What about tracking write latencies using a separate metric set? Alternatively, if the snitch
had less than RF scores, it could choose a random node.

Choosing unbalanced write coordinators for counters would only cause imbalances pre-replication:
if repair is running frequently (repair-on-write, read-repair, AES, etc), the load is balanced
according to the tokens, as usual.

I agree that adding things that are really counter specific is not healthy, unless they also
help to set us up for other atomic features in the future.

> Record dynamic snitch latencies for counter writes
> --------------------------------------------------
>
>                 Key: CASSANDRA-2364
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-2364
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>            Reporter: Stu Hood
>            Priority: Minor
>              Labels: counters
>             Fix For: 0.8
>
>
> The counter code chooses a single replica to coordinate a write, meaning that it should
be subject to dynamic snitch latencies like a read would be. This already works when there
are reads going on, because the dynamic snitch read latencies are used to pick a node to coordinate,
but when there are no reads going on (such as during a backfill) the latencies do not adjust.

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