@Override
    public String toString() {
      return "HedgedRead";
    }
<p>
There are two modes with catalog replica support.
</p>
<ol>
<li>HEDGED_READ - Client sends requests to the primary region first, within a configured amount
of time, if there is no response coming back, client sends requests to all replica regions and
takes the first response.</li>
<li>LOAD_BALANCE - Client sends requests to replica regions in a round-robin mode, if results
from replica regions are stale, next time, client sends requests for these stale locations to the
primary region. In this mode, scan requests are load balanced across all replica regions.</li>
</ol>
hbase-client/src/main/java/org/apache/hadoop/hbase/CatalogReplicaMode.java