[Bug] rocksdbcq batch dispatch should be removed

[LetLetMe]

Before Creating the Bug Report

• I found a bug, not just asking a question, which should be created in GitHub Discussions.

• I have searched the GitHub Issues and GitHub Discussions of this repository and believe that this is not a duplicate.

• I have confirmed that this bug belongs to the current repository, not other repositories of RocketMQ.

Runtime platform environment

all

RocketMQ version

all

JDK Version

all

Describe the Bug

RocksDBConsumeQueueStore 中在处理dispatchRequest时候会有一个攒批的动作，这里的初衷是为了提高效率，但是实际上并不会起到什么作用，因为rocksdb首先写入的memtable，这是纯内存操作，不会有多少性能损耗。而且这里还有导致一个bug，就是消息比较少的情况，攒批可能会比较久，这样会导致消息消费延迟，严重的话会导致最后15条消息一直消费不到。

In RocksDBConsumeQueueStore, there is a batching action when handling dispatchRequest. The original intention here is to improve efficiency, but in reality, it doesn't have much effect because RocksDB first writes to the memtable, which is a pure memory operation and doesn't incur much performance overhead. Additionally, this can lead to a bug where, in cases of fewer messages, batching might take a long time, resulting in message consumption delays. In severe cases, the last 15 messages might never be consumed.

Steps to Reproduce

对于攒批我们一般的处理方式是设置超时时间，当时间超过最大超市时间则强制刷新，但是putMessagePositionInfoWrapper没有专门的线程去定时刷新，而是由dispatchRequest触发的，当没有消息的时候，设置超时时间也没有用，所以我们在这里应该直接将这个batch去掉

For batching, our usual approach is to set a timeout, forcing a flush when the time exceeds the maximum timeout. However, putMessagePositionInfoWrapper does not have a dedicated thread for periodic flushing; instead, it is triggered by dispatchRequest. When there are no messages, setting a timeout is ineffective. Therefore, we should remove the batch directly in this case.

What Did You Expect to See?

nothing

What Did You See Instead?

nothing

Additional Context

nothing

[RongtongJin]

我发现不存在该问题，因为doReput中最终会调用finishCommitLogDispatch方法