fork of https://github.com/oxigraph/rocksdb and https://github.com/facebook/rocksdb for nextgraph and oxigraph

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Igor Canadi 1510339e52 Speed up FindObsoleteFiles ... Summary: Here's one solution we discussed on speeding up FindObsoleteFiles. Keep a set of all files in DBImpl and update the set every time we create a file. I probably missed few other spots where we create a file. It might speed things up a bit, but makes code uglier. I don't really like it. Much better approach would be to abstract all file handling to a separate class. Think of it as layer between DBImpl and Env. Having a separate class deal with file namings and deletion would benefit both code cleanliness (especially with huge DBImpl) and speed things up. It will take a huge effort to do this, though. Let's discuss offline today. Test Plan: Ran ./db_stress, verified that files are getting deleted Reviewers: dhruba, haobo, kailiu, emayanke Reviewed By: dhruba Differential Revision: https://reviews.facebook.net/D13827		11 years ago
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rocksdb	Speed up FindObsoleteFiles	11 years ago
utilities	Making the transaction log iterator more robust	11 years ago