Finalize blocks on confirmation depth #4
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It's observed that the memory usage could be extremely high without the finalization, when the chain grows to 220000+. Concretely, the culprit of the high memory usage is creating `NonCanonicalOverlay`. There are also a few other improvements to import-blocks command.
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Without the finalization, the memory usage could become extremely high when the chain grows to 220000+. With some investigation, I found that it's caused by
NonCanonicalOverlaywhen creating the DB backend.