PullResult pullResult = null;
try {
pullResult = consumer.pullBlockIfNotFound(mq, subexpress, offset, oneFetchSize);
offset = pullResult.getNextBeginOffset();
PullStatus status = pullResult.getPullStatus();
if (status == PullStatus.FOUND) {
List<MessageExt> msgList = pullResult.getMsgFoundList();
ret.addAll(msgList);
fetchSize += msgList.size();
continue;