[ https://issues.apache.org/jira/browse/CASSANDRA-2045?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13057419#comment-13057419 ]
Jonathan Ellis commented on CASSANDRA-2045: ------------------------------------------- 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. -- This message is automatically generated by JIRA. For more information on JIRA, see: http://www.atlassian.com/software/jira