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From "Nicholas Telford (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CASSANDRA-2045) Simplify HH to decrease read load when nodes come back
Date Mon, 18 Jul 2011 14:29:59 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-2045?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Nicholas Telford updated CASSANDRA-2045:
----------------------------------------

    Attachment: CASSANDRA-2045-v4.diff

Sorry about the delay to this, my free time this month has been pretty sparse.

This patch combines all previous changes and uses the new hint storage format we discussed
above.

On my machine, a pile of unrelated tests are failing (mostly in SSTable.estimateRowsFromIndex),
but I suspect this is an issue with my test setup.

If you prefer, the full workflow for this patch is available on GitHub: https://github.com/nicktelford/cassandra/tree/CASSANDRA-2045

> 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, CASSANDRA-2045-v4.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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