drainer: reduce memory usage when restart#1030

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you06 wants to merge 12 commits intopingcap:masterfrom you06:reduce-memory-usage

+202-63

Commits on Dec 29, 2020

reduce memory usage in drainer startup
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get snapshot from store when load schema
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add restore log
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add debug log
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add more debug log
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log error when load history meta failed
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add detail log
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add more debug log
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add more debug log
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resolve OOM when restart

PingCAP
authored and
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use latest tidb
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remove unused code
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