When using replication backends, now the role of a connection is not
defined by its alias but by the new connection parameter "role" that
can be set to "master", "slave" and (for redis-sentinel) "sentinel".
This also led to a redesign of how connections can be retrieved from
replication backends: the method getConnectionById() now retrieves a
connection only by its ID (ip:port pair), to get a connection by its
alias there is the new method getConnectionByAlias(). This method is
not supported by the redis-sentinel backend due to its dynamic nature
(connections are retrieved and initialized at runtime from sentinels)
but it is still possible to get a single connection from the pool by
using its ID. It is also possible to retrive a connection by its role
using the method getConnectionByRole().
NOTE: the "role" parameter is an hint for the internals of aggregate
connection backends so it is still possible that the actual role of
a connection changes during the execution of a script (e.g. a slave
gets promoted to the role of master): in this case the parameters of
that connection will not be changed as they are immutable, but the
method getConnectionByRole() will return the appropriate connection.
Predis\Client::getClientBy() has been updated with the addition of
"role" and "alias" as supported selectors.
Daniele Alessandri
Pascal Hofmann