Shard awareness extension for Scylla patchset 2#1211

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mmatczuk wants to merge 7 commits intoapache:trunkfrom scylladb:mmt/scylla_shard_aware_patch_2

+10,586-97

Commits on Mar 26, 2019

conn: introduced supported field containing payload of SUPPORTED frame

mmatczuk
and
Henrik Johansson
committed
SelectedHost: added Token function

mmatczuk
and
Henrik Johansson
committed
hostConnPool: introduced ConnPicker interface to abstract pool storage

mmatczuk
and
Henrik Johansson
committed
scylla: dedicated token aware ConnPicker

mmatczuk
and
Henrik Johansson
committed
scylla: lazily close excess connections.
Henrik Johansson
committed
scylla: give out random connections before pool equilibrium
Henrik Johansson
committed
scylla: ensure we use the correct token to determine shard
Henrik Johansson
committed