Extending the same thought from Steven. If you are going to do a small
delay, it is better to do it via a Lease.
So SCM could offer a lease for 60 seconds, with a provision to reacquire
the lease one more time.
This does mean that a single container inside the data node technically
could become la
> 4. Datanode wait until no write commands to this container, then close it.
This could be done on SCM, with a simple delay. Ie hold back the close
commands for a "normal" close for some configurable amount of time. Eg if
we hold for 60 seconds, it is likely almost all blocks will get written. If
