questions about the async reads

["=?gb18030?b?QzByZUZhc3Q=?=" <topchenfu@xxxxxx>]

Hello everyone

I've reading the ceph codes for a while, and i found that in the ReplicatedBackend, the objects_read_async function is not implenmented.

```

void ReplicatedBackend::objects_read_async(

  const hobject_t &hoid,

  const list<pair<boost::tuple<uint64_t, uint64_t, uint32_t>,

  pair<bufferlist*, Context*> > > &to_read,

  Context *on_complete,

  bool fast_read)

{

  ceph_abort_msg("async read is not used by replica pool");

}

```

in my opinion£¬make read ops asynchronously may get a lot performance enhance,

so is there anyone could tell me why ceph ReplicatedBackend does't implenment the async reads?

thanks!

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