private HRegion initHRegion(TableName tableName, String callingMethod, byte[]... families)
    throws IOException {
    return initHRegion(tableName, callingMethod, HBaseConfiguration.create(), families);
  }
Test RegionTooBusyException thrown when region is busy
hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/TestHRegion.java