Summary:
Revise according to recent change.
Also revise .arcconfig as linter codes are deleted from this branch. Otherwise "arc" always fails. This branch is supposed to contain rocksdb.org webpages, no RocksDB source codes. So no linter is fine.
Test Plan: N/A
Reviewers: haobo
CC: leveldb
Differential Revision: https://reviews.facebook.net/D17187
Summary:
1. The OpenForReadOnly() call should not lock the db. This is useful
so that multiple processes can open the same database concurrently
for reading.
2. GetUpdatesSince should not error out if the archive directory
does not exist.
3. A new constructor for WriteBatch that can takes a serialized
string as a parameter of the constructor.
Test Plan: make clean check
Reviewers: sheki
Reviewed By: sheki
CC: leveldb
Differential Revision: https://reviews.facebook.net/D7449
