January 2019
Intermediate to advanced
606 pages
15h 1m
English
book
Ceph: Designing and Implementing Scalable Storage Systems
by Michael Hackett, Vikhyat Umrao, Karan Singh, Nick Fisk
Content preview from Ceph: Designing and Implementing Scalable Storage Systems
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RocksDB
RocksDB is a high-performance key value store, which was originally forked from LevelDB, but after development, Facebook went on to offer significant performance improvements suited for multiprocessor servers with low latency storage devices. It has also had numerous feature enhancements, some of which are used in BlueStore.
RocksDB is used to store metadata about the stored objects, which was previously handled by a combination of LevelDB and XATTRs in filestore.
A feature of RocksDB, which BlueStore takes advantage of, is the ability to store the WAL on a faster storage device, which can help to lower latency of RocksDB operations. This also hopefully improves Ceph's performance, particularly for smaller I/Os. This gives a number ...
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