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Date: Thu, 3 May 2012 17:46:50 +0000 (UTC)
From: "Pavel Yaskevich (JIRA)" <jira@apache.org>
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Subject: [jira] [Commented] (CASSANDRA-3762) AutoSaving KeyCache and System
 load time improvements.
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    [ https://issues.apache.org/jira/browse/CASSANDRA-3762?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13267628#comment-13267628 ] 

Pavel Yaskevich commented on CASSANDRA-3762:
--------------------------------------------

I can agree on this point but on the other hand if we have big row cache and would read it using CF that would create a ton of random I/O as well as rearrange key cache that we have preloaded before...
                
> 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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