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Applying region snapshots optimization #1347

@flowbehappy

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@flowbehappy

https://docs.google.com/document/d/1kPIM8Q67wMUBchwym0Fxjp4mtHSaJLwbuuvfxZ8nn28/edit

  • Increase the snap-handle-pool-size setting can improve the speed of applying region snapshots.
  • Reduce the memory usage during applying region snapshots, from 3 copies to at most 2 copies.
  • Use multiple Blocks to store the data of region snapshots.

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