dgraph-io / badger / 1446
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manishrjain 
Non-locking, read-only opens (#432)

* Read-only opens

This introduces a read-only option on the DB struct. The main effect
is to force all transactions to be read-only. It also skips anything
that might write to disk.

It will put a shared lock on the directory when it's opened
read-only. This will allow other read-only opens but will deny
read-write opens until all readers have closed. If the database is
already open read-write and an attempt is made to open it
again (read-only or read-write), an error occurs.

It also:

 - Fails if the manifest doesn't exist on read-only open
 - Does not attempt to truncate the manifest
 - Skips compactors and memtable
 - All vlogs are opened read-only

* Avoid truncating vlog in read-only mode

There shouldn't be any need anyways.

* ReadOnly opens fail on corrupt DB

If there is data in a vlog to be replayed, opening the DB with
ReadOnly set will return an error.

* Unplumb the readonly args

The vlog structure already carries the opts from it's Open()

* Use flags instead of bools for OpenExistingSyncedFile

* Comment changes per @manishrjain

* OpenExistingSyncFile -> OpenExistingFile

To reflect that it's not just for synced files.

* Add a placeholder for Windows read-only mode

* Hack tests to pass through Windows failures

These tests are useless on Windows until the placeholder in
dir_windows.go is removed.

* Changes requested by @manishrjain

Arg cleanups + house preferences.

4176 of 5112 relevant lines covered (81.69%)

85039.65 hits per line

Jobs
ID Job ID Ran Files Coverage
1 1446.1 0
81.69
 Travis Job 1446.1
Source Files on build 1446