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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] Updated: (CASSANDRA-790) SSTables limited to (2^31)/15 keys
Date Tue, 16 Feb 2010 04:02:28 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-790?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jonathan Ellis updated CASSANDRA-790:
-------------------------------------

          Component/s: Core
    Affects Version/s:     (was: 0.7)
                           (was: 0.6)
                           (was: 0.5)

> SSTables limited to (2^31)/15 keys
> ----------------------------------
>
>                 Key: CASSANDRA-790
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-790
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>            Reporter: Stu Hood
>            Assignee: Stu Hood
>            Priority: Blocker
>             Fix For: 0.5
>
>         Attachments: 0001-Change-parameters-to-BloomCalculations-in-order-to-c.patch,
0001-Change-parameters-to-BloomCalculations-in-order-to-c.patch, 0002-Add-timeouts-to-forceBlockingFlush-during-tests.patch,
0002-Add-timeouts-to-forceBlockingFlush-during-tests.patch
>
>
> The current BloomFilter implementation requires a BitSet of (bucket_count * num_keys)
in size, and that calculation is currently performed in an integer, which causes overflow
for around 140 million keys in one SSTable.
> Short term fix: perform the calculation in a long, and cap the value to the maximum size
of a BitSet.
> Long term fix: begin partitioning BitSets, perhaps using Linear Bloom Filters.

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