HHVM ships with an lz4 compression library -- see https://github.com/facebook/hhvm/tree/master/hphp/third_party/lz4. Is it a viable replacement for igbinary serialization? It would require a complicate migration in production, but I suspect the overall effort required would be less than adding igbinary support for HHVM.
Version: unspecified
Severity: normal
See Also:
https://bugzilla.wikimedia.org/show_bug.cgi?id=73467
| Status | Subtype | Assigned | Task | ||
|---|---|---|---|---|---|
| Declined | None | T58596 MemcachedPeclBagOStuff: Requires igbinary serialization, hhvm fatals | |||
| Resolved | PRODUCTION ERROR | hashar | T75467 Warning: could not unserialize value, no igbinary support | ||
| Resolved | None | T63227 Migrate memcache serialization from igbinary |
We don't need to port it.
MemcachedPeclBagOStuff stores the serializer in the bitfield accompanying each value, and will use the correct deserializer regardless of which serializer is currently configured. Switching to the PHP serializer means any new keys written from now on will use PHP serialization, while existing values will continue to be readable.
We've done this for Labs already.
TODOs:
Change 119461 had a related patch set uploaded by Ori.livneh:
Set serializer to 'php' for production memcache
Getting close to the 30 day mark of the conf change in https://bugzilla.wikimedia.org/show_bug.cgi?id=61227. Since parser cache is stored for 30 days (longer than most other stuff, rev cache is only 7) then most cache entries should be in the new format by now.