default void postMove(final ObserverContext<MasterCoprocessorEnvironment> ctx,
    final RegionInfo region, final ServerName srcServer, final ServerName destServer)
    throws IOException {
  }
Called after the region move has been requested.
@param ctx        the environment to interact with the framework and master
@param region     the RegionInfo
@param srcServer  the source ServerName
@param destServer the destination ServerName
hbase-server/src/main/java/org/apache/hadoop/hbase/coprocessor/MasterObserver.java