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Date: Tue, 15 Jan 2008 17:13:34 -0800 (PST)
From: "Edward Yoon (JIRA)" <jira@apache.org>
To: hadoop-dev@lucene.apache.org
Subject: [jira] Commented: (HADOOP-2291) [hbase] Add row count estimator
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    [ https://issues.apache.org/jira/browse/HADOOP-2291?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12559323#action_12559323 ] 

Edward Yoon commented on HADOOP-2291:
-------------------------------------

Sorry for a delay.

It seems difficult to me.
I need some help.

> [hbase] Add row count estimator
> -------------------------------
>
>                 Key: HADOOP-2291
>                 URL: https://issues.apache.org/jira/browse/HADOOP-2291
>             Project: Hadoop
>          Issue Type: New Feature
>          Components: contrib/hbase
>            Reporter: stack
>            Assignee: Edward Yoon
>            Priority: Minor
>         Attachments: 2291_v01.patch, Keying.java
>
>
> Internally we have a little tool that will do a rough estimate of how many rows there are in a dataHbase.  It keeps getting larger and larger partitions running scanners until it turns up > N occupied rows.  Once it has a number > N, it multiples by the partition size to get an approximate row count.  
> This issue is about generalizing this feature so it could sit in the general hbase install.  It would look something like:
> {code}
> long getApproximateRowCount(final Text startRow, final Text endRow, final long minimumCountPerPartition, final long maximumPartitionSize)
> {code}
> Larger minimumCountPerPartition and maximumPartitionSize values would make the count more accurate but would mean the method ran longer.

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