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From "Andrzej Bialecki (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HBASE-908) Add approximate counting to CountingBloomFilter
Date Tue, 30 Sep 2008 21:13:46 GMT

     [ https://issues.apache.org/jira/browse/HBASE-908?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Andrzej Bialecki  updated HBASE-908:
------------------------------------

    Attachment: bloom.patch

This patch adds a new method, approximateCount(Key). There is also a JUnit test to test this
functionality.

> Add approximate counting to CountingBloomFilter
> -----------------------------------------------
>
>                 Key: HBASE-908
>                 URL: https://issues.apache.org/jira/browse/HBASE-908
>             Project: Hadoop HBase
>          Issue Type: Improvement
>          Components: util
>    Affects Versions: 0.19.0
>            Reporter: Andrzej Bialecki 
>             Fix For: 0.19.0
>
>         Attachments: bloom.patch
>
>
> CountingBloomFilter can return approximate count of how many times any particular key
was added to the filter. This means that we can use a CountingBloomFilter like an approximate
map of key->count, for values of count significantly smaller than the bucket size (15 in
this implementation).

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