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From "Peter Bailis (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-5455) Remove PBSPredictor
Date Fri, 10 May 2013 19:33:16 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-5455?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13654761#comment-13654761
] 

Peter Bailis commented on CASSANDRA-5455:
-----------------------------------------

I don't believe that the StorageProxy tracks the latencies according to the same granularity.
For example, the PBS latency tracking will record both how long it took for the request to
reach a remote replica and be processed as well as how long the return trip takes.

That said, it shouldn't be too difficult to either 1.) simply expose the recorded latencies
via an optional module providing a "finer granularity tracing" interface via JMX [thereby
removing all actual prediction code but keeping the logging in place for folks who might want
this] or 2.) modifying StorageProxy to log these latencies in addition to the coarser granularity
measurements it already takes.

I can provide assistance with either.
                
> Remove PBSPredictor
> -------------------
>
>                 Key: CASSANDRA-5455
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-5455
>             Project: Cassandra
>          Issue Type: Bug
>            Reporter: Jonathan Ellis
>            Assignee: Jonathan Ellis
>             Fix For: 2.0
>
>         Attachments: 5455.txt
>
>
> It was a fun experiment, but it's unmaintained and the bar to understanding what is going
on is high.  Case in point: PBSTest has been failing intermittently for some time now, possibly
even since it was created.  Or possibly not and it was a regression from a refactoring we
did.  Who knows?

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