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https://issues.apache.org/jira/browse/CASSANDRA-2045?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13057419#comment-13057419
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Jonathan Ellis edited comment on CASSANDRA-2045 at 6/29/11 7:36 PM:
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bq. losing hints during upgrade isn't the end of the world
Right. I'm saying we should do this:
{noformat}
Hints: { // cf
<dest ip>: { // key
<key>: { // super-column
<table>-<cf>: <id> // column
mutation: <mutation> // column
}
}
}
{noformat}
So we denormalize but we gain not having to do secondary-lookup-per-mutation,
which is our main motivation for the change. (And single-destination-per-hint
is by far the common case.)
bq. Can we open this as a dependent ticket?
WFM.
was (Author: jbellis):
bq. losing hints during upgrade isn't the end of the world
Right. I'm saying we should do this:
Hints: { // cf
<dest ip>: { // key
<key>: { // super-column
<table>-<cf>: <id> // column
mutation: <mutation> // column
}
}
}
So we denormalize but we gain not having to do secondary-lookup-per-mutation,
which is our main motivation for the change. (And single-destination-per-hint
is by far the common case.)
bq. Can we open this as a dependent ticket?
WFM.
> 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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