[PATCH 2/2] vinyl: implement index compact method

[Konstantin Osipov]

* Vladimir Davydov <vdavydov.dev at gmail.com> [18/05/18 19:21]:
> Force major compaction of all ranges when index.compact() is called.
> Note, the function only triggers compaction, it doesn't wait until
> compaction is complete.
> 
> Closes #3139

OK to push.

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