membuffer: protect snapshot getter with mutex #1527
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Signed-off-by: you06 <[email protected]>
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ref pingcap/tidb#58289, pingcap/tidb#56178
This is a replacement of #1479
TiDB Change: pingcap/tidb#58345
TiDB allows snapshot read and write running concurrently, the write won't affect the result the snapshot read, but we should protect it from data race.