@Override
    public void process(DistributionMessage msg) {
      try {
        if (msg instanceof ManageBucketReplyMessage) {
          ManageBucketReplyMessage reply = (ManageBucketReplyMessage) msg;
          this.msg = reply;
          if (logger.isTraceEnabled(LogMarker.DM_VERBOSE)) {
            logger.trace(LogMarker.DM_VERBOSE, "NodeResponse return value is {} isInitializing {}",
                reply.acceptedBucket, reply.notYetInitialized);
          }
        } else {
          Assert.assertTrue(msg instanceof ReplyMessage);
        }
      } finally {
        super.process(msg);
      }
    }
the message that triggers return from waitForAcceptance. This will be null if the target
member exited
geode-core/src/main/java/org/apache/geode/internal/cache/partitioned/ManageBucketMessage.java