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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-2045) Simplify HH to decrease read load when nodes come back
Date Thu, 30 Jun 2011 13:21:28 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-2045?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13057812#comment-13057812
] 

Jonathan Ellis commented on CASSANDRA-2045:
-------------------------------------------

It's fine the way it is. It's simpler if the deserializers can assume they will get a valid
version.

> Simplify HH to decrease read load when nodes come back
> ------------------------------------------------------
>
>                 Key: CASSANDRA-2045
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-2045
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: Chris Goffinet
>            Assignee: Nicholas Telford
>             Fix For: 1.0
>
>         Attachments: 0001-Changed-storage-of-Hints-to-store-a-serialized-RowMu.patch,
0002-Refactored-HintedHandoffManager.sendRow-to-reduce-co.patch, 0003-Fixed-some-coding-style-issues.patch,
0004-Fixed-direct-usage-of-Gossiper.getEndpointStateForEn.patch, 0005-Removed-duplicate-failure-detection-conditionals.-It.patch,
0006-Removed-handling-of-old-style-hints.patch, 2045-v3.txt, 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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