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From "Jonathan Ellis (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-2392) Saving IndexSummaries to disk
Date Wed, 18 Apr 2012 18:42:41 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-2392?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13256804#comment-13256804
] 

Jonathan Ellis commented on CASSANDRA-2392:
-------------------------------------------

For the record, I'm still fine with saying "loading caches will slow down startup, deal with
it," but I think we have a good plan of attack on 3762 now and it may be simpler to just do
that first, before rebasing this.  Which is also fine.
                
> Saving IndexSummaries to disk
> -----------------------------
>
>                 Key: CASSANDRA-2392
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-2392
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: Chris Goffinet
>            Assignee: Vijay
>            Priority: Minor
>             Fix For: 1.2
>
>         Attachments: 0001-CASSANDRA-2392-v6.patch, 0001-re-factor-first-and-last.patch,
0001-save-summaries-to-disk-v4.patch, 0001-save-summaries-to-disk.patch, 0002-save-summaries-to-disk-v2.patch,
0002-save-summaries-to-disk-v3.patch, 0002-save-summaries-to-disk.patch, CASSANDRA-2392-v5.patch
>
>
> For nodes with millions of keys, doing rolling restarts that take over 10 minutes per
node can be painful if you have 100 node cluster. All of our time is spent on doing index
summary computations on startup. It would be great if we could save those to disk as well.
Our indexes are quite large.

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