Cold bootstrap seems unnecessarily slow #995
Description
Describe the improvement
Cold bootstrap takes a long time (hours) with Avalanche which makes recovery scenarios quite risky for validator nodes due to high uptime requirements.
Avalanchego shouldn't need to retrieve all blocks for a chain before executing state transitions. Executing state transitions as soon as the first set of blocks are received would make cold bootstrap times almost twice as fast as I understand from my own observation (on a low-end hardware).
Similarly, a new chain could be immediately fetched while state transitions are executed for the previous chain. Currently, it looks like this:
thread 1: [.....fetch P......][.......execute P.....][..........fetch X........][.......execute X]
This should be possible instead:
thread 1: [.....fetch P......][..........fetch X........]
thread 2: [.......execute P.....]
thread 3: [.......execute X]
Obviously, this would increase the CPU-load of an Avalanche node during bootstrap, but I believe cut-down bootstrap times can easily make up for it.
Operating System
Linux 3.10.108 x86_64 Braswell
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