dgraph-io / dgraph / 32

44%

main: 66%

Pull #127

travis-ci

Implement multiple store backends

The first additional backend is BoltDB.  A `store` flag has been added
to commands, that accepts the name of a store (as of this commit, valid
values are `boltdb` and `rocksdb`).

Stores register their availability via `init()`, which means that new
stores should be imported for side-effects wherever they may be
required directly (predominantly in commands or tests).

Store implementations can be included via build tags.

BREAKING: The default store has been set to `boltdb`, primarily because
this store is native Go, and can be built against even when CGO is not
available.  To produce builds that include rocksdb support, the
`rocksdb` tag _must_ be supplied, ie:

```
go install -tags rocksdb
```

This initial implementation does not include a functional `merge`
command for boltdb.

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