[Do not review] Revert Background compression and Block Pool fix #1405
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Update- I've created separate PRs for each commit. Do not review this PR. I'll close this PR once all the smaller PRs are merged.
#1406
#1407
#1408
#1409
All the PRs mentioned above are reverted.
This PR reverts 4 commits
Background Compression/Decompression - Revert PR #1409
Decompression Pool - Revert PR #1408
Decompression Pool race fix - Revert PR #1407
Builder assert fix (revert PR #1406) (this was reverted because
b.sz
no longer exists and that assert is no longer valid)The commits mentioned above are being reverted because we have seen some crashes which could be caused by these changes. We haven't been able to reproduce the crashes yet.
Related to #1389, #1388, #1387
Also see https://discuss.dgraph.io/t/current-state-of-badger-crashes/7602
This change is