public void sendGlobalBarrierReached() throws ForeignException {
    try {
      // trigger to have member run {@link Subprocedure#insideBarrier}
      coord.getRpcs().sendGlobalBarrierReached(this, Lists.newArrayList(inBarrierMembers));
    } catch (IOException e) {
      coord.rpcConnectionFailure("Can't reach controller.", e);
    }
  }
Sends a message to all members that the global barrier condition has been satisfied. This
should only be executed after all members have completed its
{@link Subprocedure#acquireBarrier()} call successfully. This triggers the member
{@link Subprocedure#insideBarrier} method.
hbase-server/src/main/java/org/apache/hadoop/hbase/procedure/Procedure.java