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From "Sylvain Lebresne (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-2804) expose dropped messages, exceptions over JMX
Date Wed, 22 Jun 2011 10:16:47 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-2804?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13053148#comment-13053148
] 

Sylvain Lebresne commented on CASSANDRA-2804:
---------------------------------------------

bq. It would also be nice to have request time stats as we don't know how long requests live
in queues so it is hard to say how long clients wait to perform an operation.

That is the goal of the values (RecentReadLatencyMicros, TotalReadLatencyMicros, ...) exposed
for each column family in the org.apache.cassandra.db:ColumnFamilies.<keyspaceName>.<columnFamilyName>
mbean. It doesn't include any queuing, it is recorded directly in the thrift thread accepting
the request (the only thing it doesn't take into account is the small validation we do of
the request, but that's a handful of cpu cycles so it doesn't matter). 

> expose dropped messages, exceptions over JMX
> --------------------------------------------
>
>                 Key: CASSANDRA-2804
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-2804
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Tools
>            Reporter: Jonathan Ellis
>            Assignee: Jonathan Ellis
>            Priority: Minor
>             Fix For: 0.8.2
>
>


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