@Override
    protected boolean stillWaiting() {
      targetMemberHasLeft =
          targetMemberHasLeft || !getDistributionManager().isCurrentMember(targetMember);
      return super.stillWaiting() && !targetMemberHasLeft;
    }
process the failure set from sending the message
geode-core/src/main/java/org/apache/geode/internal/cache/StateFlushOperation.java