default CompletableFuture<HRegionLocation> getRegionLocation(byte[] row) {
    return getRegionLocation(row, false);
  }
Finds the region on which the given row is being served. Does not reload the cache.
<p/>
Returns the location of the region to which the row belongs.
@param row Row to find.
hbase-client/src/main/java/org/apache/hadoop/hbase/client/AsyncTableRegionLocator.java