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https://issues.apache.org/jira/browse/HBASE-32?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12705639#action_12705639
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Jonathan Gray commented on HBASE-32:
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I think we should be storing statistics about StoreFiles in the new HFile meta
blocks. To start, this could be things like total row count in the storefile.
Eventually could expand that in to a row index.
These kinds of statistics could be useful all over the place.
> [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
> 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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