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Posted to commits@cassandra.apache.org by "Brandon Williams (Commented) (JIRA)" <ji...@apache.org> on 2012/03/08 20:00:04 UTC
[jira] [Commented] (CASSANDRA-4023) Batch reading BloomFilters on
startup
[ 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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