increase rblock cache in root state #938
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If some mblocks are not included in root block for a while, e.g., 2 days, then if a new root block includes them, the mblock's prev_root_block will be 2 days away from the latest root block, which causes the is_same_chain check to take a long time.
pyquarkchain/quarkchain/cluster/root_state.py
Line 62 in af1dd06
This diff increases the cache to 8K so that we could accept ~5 days difference of mblock's prev_root_block and the latest root block.