@Override
    public void process(DistributionMessage m) {
      try {
        if (m instanceof ManageBackupBucketReplyMessage) {
          ManageBackupBucketReplyMessage reply = (ManageBackupBucketReplyMessage) m;
          msg = reply;
          if (logger.isTraceEnabled(LogMarker.DM_VERBOSE)) {
            logger.trace(LogMarker.DM_VERBOSE, "NodeResponse return value is {} isInitializng={}",
                reply.acceptedBucket, reply.notYetInitialized);
          }
        } else {
          Assert.assertTrue(m instanceof ReplyMessage);
        }
      } finally {
        super.process(m);
      }
    }
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/ManageBackupBucketMessage.java