gulu-goolu opened a new issue, #3014:
URL: https://github.com/apache/brpc/issues/3014
**Describe the bug**
client 侧为了节省带宽，使用了 snappy 压缩，但是测试下来，发现服务端用 snappy 解压的数据和 client 侧输入的数据不一致。
**To Reproduce**
把测试用的请求 dump 到磁盘，然后用 SampleIterator 遍历，并分别用 brpc 中的 snappy 和 github 上的
snappy 解压。其中 brpc 里面的 snappy 每次解压的结果都不一致，而 github 仓库中的 snappy 每次解压的结果都是一致的。
```
brpc::SampleIterator iter(dir_);
while (true) {
std::unique_ptr<brpc::SampledRequest> sampled(iter.Next());
if (sampled == nullptr) {
break;
}
if (sampled->meta.compress_type() != brpc::COMPRESS_TYPE_SNAPPY) {
continue;
}
std::cout << "----------------- " << sampled->request.size() <<
"--------------" << std::endl;
butil::IOBuf brpc_decompressed_v1;
butil::IOBuf brpc_decompressed_v2;
ABSL_CHECK(brpc::policy::SnappyDecompress(sampled->request,
&brpc_decompressed_v1));
ABSL_CHECK(brpc::policy::SnappyDecompress(sampled->request,
&brpc_decompressed_v2));
if (brpc_decompressed_v1.to_string() ==
brpc_decompressed_v2.to_string()) {
std::cout << "brpc decompress, same" << std::endl;
} else {
std::cout << "brpc decompress, diff" << std::endl;
}
std::string snappy_uncompressed_v1;
std::string snappy_uncompressed_v2;
auto compressed = sampled->request.to_string();
ABSL_CHECK(snappy::Uncompress(compressed.data(), compressed.size(),
&snappy_uncompressed_v1));
ABSL_CHECK(snappy::Uncompress(compressed.data(), compressed.size(),
&snappy_uncompressed_v2));
if (snappy_uncompressed_v1 == snappy_uncompressed_v2) {
std::cout << "snappy decompress, same" << std::endl;
} else {
std::cout << "snappy decompress, diff" << std::endl;
}
}
```
**Expected behavior**
**Versions**
OS: ubuntu 20.04
Compiler: clang-18
brpc: 1.13.0
protobuf: 29.4
**Additional context/screenshots**
测试程序输出的结果。可以看到，brpc 里面的 snappy decompress 的结果，会有不一致的情况。而 github 上的
snappy，每次解压的结果都是一致的。
```
----------------- 105486--------------
brpc decompress, diff
snappy decompress, same
----------------- 47149--------------
brpc decompress, same
snappy decompress, same
----------------- 79794--------------
brpc decompress, diff
snappy decompress, same
----------------- 74139--------------
brpc decompress, same
snappy decompress, same
----------------- 107280--------------
brpc decompress, diff
snappy decompress, same
```
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