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From "Yuki Morishita (Updated) (JIRA)" <>
Subject [jira] [Updated] (CASSANDRA-4023) Improve BloomFilter deserialization performance
Date Sat, 24 Mar 2012 19:16:25 GMT


Yuki Morishita updated CASSANDRA-4023:

    Attachment: trunk-4023.txt

bq. Could we rename lastKey to lastKeyForUnpromoted, and then take the hasPromotedIndexes
out of that assignment?


bq. I guess deserializePositionOnly is only for unpromoted indexes?

It deserializes whole row index only when decoratedKey is not null AND cache key. Otherwise
only deserialize position.
> Improve BloomFilter deserialization performance
> -----------------------------------------------
>                 Key: CASSANDRA-4023
>                 URL:
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>    Affects Versions: 1.0.1
>            Reporter: Joaquin Casares
>            Assignee: Yuki Morishita
>            Priority: Minor
>              Labels: datastax_qa
>             Fix For: 1.0.9, 1.1.0
>         Attachments: 4023.txt, cassandra-1.0-4023-v2.txt, cassandra-1.0-4023-v3.txt,
> 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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