[NEMO-787] Pack Block Location Request Messaging

snuspl / nemo

Nemo: A flexible data processing system

https://snuspl.github.io/nemo/

Apache License 2.0

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Closed sanha closed 6 years ago

sanha commented 6 years ago

This PR:

collects the request messages for a single block in driver and handle them with a single block id string instance.
shares the Future of a block location response in executor if a request for the same block is already pending.

Resolves #787.