storage: revise to open-write-close mode #52
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1. Use debug.SetMemoryLimit to hint the Go GC 2. Tweak BadgerDB config parameters to reduce memory usage
In our cases, will not write to BadgerDB value log since the value is smaller than the value threshold. Since there is no data in the value log, it's useless to trigger ValueGC
This reverts commit acdd7d4.
1. Batch submit with interval flush 2. Inserted records count is maintained by types. 3. On-demand reclaim on insertion 4. Close and open db when sys mem is larger than expected
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