Negative value of preAllocatedSize

[zuston]

I found sometimes the value of preAllocatedSize is negative in the shuffle server log, which makes me confused. Maybe this problem is caused by race condition.

[jerqi]

It's abnormal. It should be caused by some bugs.

[xianjingfeng]

We have found this problem before, and it has not occurred since #159

[zuston]

We have found this problem before, and it has not occurred since #159

#159 has been applied in our internal uniffle cluster, but it still occurred.

[xianjingfeng]

If the requireBufferId just expires when writing data, it may occurred. Maybe we need to introduce locks when memory be released.