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From "Nicholas Telford (JIRA)" <>
Subject [jira] [Updated] (CASSANDRA-2045) Simplify HH to decrease read load when nodes come back
Date Mon, 13 Jun 2011 16:19:51 GMT


Nicholas Telford updated CASSANDRA-2045:

    Attachment: CASSANDRA-2045-simplify-hinted-handoff-002.diff

* Rebased patch to latest trunk.
* Changed serialization to use cached RowMutation.getSerializedBuffer

I agree with your thoughts on removing the old-style hinting, although I haven't given the
impact on compatibility. As far as I can tell, using my patch removing the old style hinting
would be a matter of removing {{hintedMutation.apply();}} from {{RowMutationVerbHandler@63}}.
For now, I've left it as-is.

I tried to keep to the CodingStyle as much as possible; is there anything specific you noticed
that was wrong?

Btw, the tests I promised have been delayed by nightmarish work-schedule. I'll try to get
them sorted ASAP though.

> Simplify HH to decrease read load when nodes come back
> ------------------------------------------------------
>                 Key: CASSANDRA-2045
>                 URL:
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: Chris Goffinet
>            Assignee: Nicholas Telford
>             Fix For: 1.0
>         Attachments: CASSANDRA-2045-simplify-hinted-handoff-001.diff, CASSANDRA-2045-simplify-hinted-handoff-002.diff
> Currently when HH is enabled, hints are stored, and when a node comes back, we begin
sending that node data. We do a lookup on the local node for the row to send. To help reduce
read load (if a node is offline for long period of time) we should store the data we want
forward the node locally instead. We wouldn't have to do any lookups, just take byte[] and
send to the destination.

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