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From "Pavel Yaskevich (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-3762) AutoSaving KeyCache and System load time improvements.
Date Thu, 03 May 2012 17:46:50 GMT

    [ 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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