@Override
  protected boolean remoteCallFailed(final MasterProcedureEnv env, final RegionStateNode regionNode,
    final IOException exception) {
    return true;
  }
Returns If true, we will re-wake up this procedure; if false, the procedure stays suspended.
hbase-server/src/main/java/org/apache/hadoop/hbase/master/assignment/UnassignProcedure.java