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3.0-Upgrade.md

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Dalli 3.0

This major version update contains several backwards incompatible changes.

  • :dalli_store has been removed. Users should migrate to the official Rails :mem_cache_store, documented in the caching guide.
  • Attempting to store a larger value than allowed by memcached used to print a warning and truncate the value. This now raises an error to prevent silent data corruption.
  • Compression now defaults to true for large values (greater than 4KB). This is intended to minimize errors due to the previous note.
  • Errors marshalling values now raise rather than just printing an error.
  • The Rack session adapter has been refactored to remove support for thread-unsafe configurations. You will need to include the connection_pool gem in your Gemfile to ensure session operations are thread-safe.
  • Support for the kgio gem has been removed, it is not relevant in Ruby 2.3+.
  • Removed inline native code, use Ruby 2.3+ support for bsearch instead.
  • The CAS operations previously in 'dalli/cas/client' have been integrated into 'dalli/client'.

Future Directions

The memcached project has deprecated the binary protocol used by Dalli in favor of a new meta/text protocol that is somewhat human readable.

Dalli 4.0 will move in this direction and require memcached 1.6+.