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From "Brandon Williams (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-4023) Batch reading BloomFilters on startup
Date Thu, 08 Mar 2012 19:00:04 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-4023?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13225393#comment-13225393
] 

Brandon Williams commented on CASSANDRA-4023:
---------------------------------------------

The theory here being that the multithreadedness is causing seek contention when loading the
sstables.
                
> Batch reading BloomFilters on startup
> -------------------------------------
>
>                 Key: CASSANDRA-4023
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-4023
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: Joaquin Casares
>              Labels: datastax_qa
>
> The difference of startup times between a 0.8.7 cluster and 1.0.7 cluster with the same
amount of data is 4x greater in 1.0.7.
> It seems as though 1.0.7 loads the BloomFilter through a series of reading longs out
in a multithreaded process while 0.8.7 reads the entire object.
> Perhaps we should update the new BloomFilter to do reading in batch as well?

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