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rocksdb/ROCKSDB_LITE.md
Igor Canadi 588bca2020 RocksDBLite 
Summary:
Introducing RocksDBLite! Removes all the non-essential features and reduces the binary size. This effort should help our adoption on mobile.

Binary size when compiling for IOS (`TARGET_OS=IOS m static_lib`) is down to 9MB from 15MB (without stripping)

Test Plan: compiles :)

Reviewers: dhruba, haobo, ljin, sdong, yhchiang

Reviewed By: yhchiang

CC: leveldb

Differential Revision: https://reviews.facebook.net/D17835
2014-04-15 13:39:26 -07:00

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RocksDBLite

RocksDBLite is a project focused on mobile use cases, which don't need a lot of fancy things we've built for server workloads and they are very sensitive to binary size. For that reason, we added a compile flag ROCKSDB_LITE that comments out a lot of the nonessential code and keeps the binary lean.

Some examples of the features disabled by ROCKSDB_LITE:

  • compiled-in support for LDB tool
  • No backupable DB
  • No support for replication (which we provide in form of TrasactionalIterator)
  • No advanced monitoring tools
  • No special-purpose memtables that are highly optimized for specific use cases

When adding a new big feature to RocksDB, please add ROCKSDB_LITE compile guard if:

  • Nobody from mobile really needs your feature,
  • Your feature is adding a lot of weight to the binary.

Don't add ROCKSDB_LITE compile guard if:

  • It would introduce a lot of code complexity. Compile guards make code harder to read. It's a trade-off.
  • Your feature is not adding a lot of weight.

If unsure, ask. :)