[hbase] Add row count estimator
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Key: HADOOP-2291
URL: https://issues.apache.org/jira/browse/HADOOP-2291
Project: Hadoop
Issue Type: New Feature
Components: contrib/hbase
Reporter: stack
Priority: Minor
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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