传输snappy压缩数据，出现数据丢失，求大佬看看🙏

利用request_attachment传输snappy压缩后的二进制数据，在请求量偏大时，从request_attachment取出该数据，存在数据丢失问题。

The issue names request_attachment and Snappy-compressed binary data, but no source files, tests, or entry points. Start by reproducing the loss under high request volume and trace the data from transmission through retrieval. Done means the retrieved bytes consistently match the sent bytes, with a regression test covering the reported case.

Written by the indexing model from the issue text.