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From "Jim Kellerman (JIRA)" <j...@apache.org>
Subject [jira] Reopened: (HBASE-32) [hbase] Add row count estimator
Date Wed, 23 Apr 2008 22:59:21 GMT

     [ https://issues.apache.org/jira/browse/HBASE-32?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jim Kellerman reopened HBASE-32:
--------------------------------


Not committed. Reopening.

> [hbase] Add row count estimator
> -------------------------------
>
>                 Key: HBASE-32
>                 URL: https://issues.apache.org/jira/browse/HBASE-32
>             Project: Hadoop HBase
>          Issue Type: New Feature
>          Components: client
>            Reporter: stack
>            Priority: Minor
>             Fix For: 0.2.0, 0.1.2
>
>         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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