Newer Memcached's do not support the underlying protocol commands that
getAllKeys() is implemented with. We should fallback to clearing
everything in that case, as causing (temporary) performance problems for
other applications on the server is better than having stale cached data.
Prevents to have the cache reused by other instances on the server which have possible the same instance ID and also invalidates older cache entries after an upgrade which can cause unwanted side-effects.
Impact for deployment: The same cache will only get used if ownCloud is installed with the same version and under the same path. But this should be a basic requirement anyways.
Caches divided up into two groups: distributed and local. 'Low latency' is an
alias for local caches, while the standard `create()` call tries to get
distributed caches first, then local caches.
Memcache backend is set in `config.php`, with the keys `memcache.local` and
`memcache.distributed`. If not set, `memcache.distributed` defaults to the value
of `memcache.local`.
APCu before 4.0.6 is unbelievable buggy and tend to segfault the PHP process (i.e. the whole webserver)
This potentially fixes https://github.com/owncloud/core/issues/14175
Requires a backport to stable8
The default value of the $format parameter of the APCIterator constructur is
APC_ITER_ALL which instructs the iterator to provide all available information
on cache values being iterated over. Only the key value is necessary for
matching and deletion via apc_delete(), though.
This prevents a "Format values FILENAME, DEVICE, INODE, MD5, NUM_HITS, MTIME,
CTIME, DTIME, ATIME, REFCOUNT not supported yet." notice on HHVM.
Add support for multiple memcached servers.
* owncloud/memcached-multiple-servers:
Readd support for memcached_server config variable.
Add support for multiple memcached servers.
Sometimes it's not possible to disable APC entirely and some of
apc_functions are disabled. Only thing which is possible is
to disable apc.enable option.
