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From "Nicolas Spiegelberg (JIRA)" <j...@apache.org>
Subject [jira] Work started: (HBASE-1200) Add bloomfilters; use dynamicbloomfilter instead of base bloomfilter
Date Fri, 23 Apr 2010 19:08:51 GMT

     [ https://issues.apache.org/jira/browse/HBASE-1200?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Work on HBASE-1200 started by Nicolas Spiegelberg.

> Add bloomfilters; use dynamicbloomfilter instead of base bloomfilter
> --------------------------------------------------------------------
>
>                 Key: HBASE-1200
>                 URL: https://issues.apache.org/jira/browse/HBASE-1200
>             Project: Hadoop HBase
>          Issue Type: Task
>            Reporter: stack
>            Assignee: Nicolas Spiegelberg
>             Fix For: 0.21.0
>
>         Attachments: ryan_bloomfilter.patch
>
>
> Add bloomfiltering to hfile.  Should it be optional or on always?  Currently, we bloom
filter rows only, not the column + ts component, which seems good place to start but we size
the bloomfilter with the number of entries we are about to flush which seems like usually
we'd be making a filter too big.  How to figure how many rows in the flush?   We should use
the DynamicBloomFilter as Andrezj does up in hadoop BloomFilterMapFile.  Start small and let
it resize as entries are added.

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