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dgraph-io / badger

Fast key-value DB in Go.
https://dgraph.io/badger
Apache License 2.0
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[QUESTION]: Why badger use WAL? #2015

Closed acekingke closed 7 months ago

acekingke commented 7 months ago

Question.

I see the badge codes, in memtable.go file, there is wal for memtable, but I have read wisckey paper, Instead of wal, the vlog can ensure the consistency, Why bager still use wal ?

mangalaman93 commented 7 months ago

At some point, we realized that VLOG GC was getting complex due to the fact it was also used as a WAL. In Dgraph, we don't even use VLOG any more. I think this needs rework.

acekingke commented 7 months ago

Thanks