memcached

Simple memcached server.

###Usage go get github.com/Skipor/memcached/cmd/memcached memcached --help for all options memcached to start server on default port memcached -aof-name ./memcached.aof to start server with AOF persistence on memcached -aof-name ./memcached.aof -sync 2s sync log not on every command, but every passed period

Features

• No third party packages for app, server and cache logic.
  • That was tack constraint.
  • I have used only small github.com/facebookgo/stackerr package for errors with stack traces.
• Parallel reads, serialized writes.
• Items data sync.Pool recycle.
• Low allocation text protocol parse.
• AOF persistence with configurable sync options.
  • Every command can be synced, or sync can be done by ticker.
  • Low latency fast log rotation.
    • When log grows large, background goroutine takes fast snapshot under read lock.
    • Snapshot is writen without log lock.
• Many unit and integration tests.

TODO

• LRU crawler
  • goroutine waking up on ticker; take RLock; start goroutine per queue; find expired; save them; take write lock and remove them.
• Refactor integration load tester. Do more load tests and comparation with original memcached.
• Test CLI helper functions
• RDB persistence
  • point-in-time snapshots of your dataset at specified intervals
  • current version already use snapshots to archive large AOF, so it is easy to implement such feature
• Profiling with pprof and optimisation
• Snapshot consistency check
  • Now check happen only in build with debug tag
• Optional
  • replace state snapshot usage as AOF rotation