[jira] [Issue Comment Edited] (CASSANDRA-3762) AutoSaving KeyCache and System load time improvements.

["Jonathan Ellis (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CASSANDRA-3762?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13267605#comment-13267605 ] 

Jonathan Ellis edited comment on CASSANDRA-3762 at 5/3/12 5:21 PM:
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Agreed on both counts -- I don't think this approach works for row cache, nor do I think row cache is as important to optimize.
                
      was (Author: jbellis):
    Agreed on both counts -- I don't think this approach works for row cache, nor do I think it's as important to optimize.
                  
> AutoSaving KeyCache and System load time improvements.
> ------------------------------------------------------
>
>                 Key: CASSANDRA-3762
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-3762
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>    Affects Versions: 1.2
>            Reporter: Vijay
>            Assignee: Vijay
>            Priority: Minor
>             Fix For: 1.2
>
>         Attachments: 0001-CASSANDRA-3762-v2.patch, 0001-CASSANDRA-3762-v3.patch, 0001-SavedKeyCache-load-time-improvements.patch
>
>
> CASSANDRA-2392 saves the index summary to the disk... but when we have saved cache we will still scan through the index to get the data out.
> We might be able to separate this from SSTR.load and let it load the index summary, once all the SST's are loaded we might be able to check the bloomfilter and do a random IO on fewer Index's to populate the KeyCache.

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