Get region counts for an HBase service

region_counts.rb

import org.apache.hadoop.hbase.HBaseConfiguration
import org.apache.hadoop.hbase.client.HBaseAdmin
import org.apache.hadoop.hbase.client.HTable
import org.apache.hadoop.hbase.util.Bytes

conf = HBaseConfiguration.create()
admin = HBaseAdmin.new(conf)

tables = admin.listTables()

table_regioncounts = {}

tables.each do |t|
  table_name = Bytes.toString(t.getName())
  table_handle = HTable.new(conf, table_name)

  regions = table_handle.getRegionsInfo()

  table_regioncounts[table_name] = regions.size

  table_handle.close
end

puts table_regioncounts.inspect