void memberAcquiredBarrier(String procName, final String member) {
    Procedure proc = procedures.get(procName);
    if (proc == null) {
      LOG.warn(
        "Member '" + member + "' is trying to acquire an unknown procedure '" + procName + "'");
      return;
    }
    if (LOG.isTraceEnabled()) {
      LOG.trace("Member '" + member + "' acquired procedure '" + procName + "'");
    }
    proc.barrierAcquiredByMember(member);
  }
Notification that the procedure had the specified member acquired its part of the barrier via
{@link Subprocedure#acquireBarrier()}.
@param procName name of the procedure that acquired
@param member   name of the member that acquired
hbase-server/src/main/java/org/apache/hadoop/hbase/procedure/ProcedureCoordinator.java