@Override
    public void process(final DistributionManager dm, final ReplyProcessor21 processor) {
      if (logger.isTraceEnabled(LogMarker.STATE_FLUSH_OP_VERBOSE)) {
        logger.trace(LogMarker.STATE_FLUSH_OP_VERBOSE, "Processing {}", this);
      }
      super.process(dm, processor);
    }
the member for whom this ack is being sent
geode-core/src/main/java/org/apache/geode/internal/cache/StateFlushOperation.java