Yes, it is very possible.

As the Documentation says, you should have a minimum of three nodes in a Percona XtraDB Cluster. You only need one node out of the three nodes.


Make sure all nodes in the PXC have unique server_ids.
Make sure the Master you are replicating from has a unique server_id from the PXC nodes
Make sure the master and every PXC node is configured with the following

binlog_format=ROW
log-slave-updates

Make sure the master and every PXC node is using binlog_format=ROW


Pick one node and set it up as you would a DB Server designated as a Slave via CHANGE MASTER TO.

If you are going to set up any replication filters, restrict it to just the PXC node that is your Slave. Personally, I would stay away from using replication filters altogether in this setup since one of Percona's Galera Instructors does not feel good about it.

Please be aware that data takes time to be on all nodes at the same instant of time (See Investigating MySQL Replication Latency in Percona XtraDB Cluster)

By the way, you can use any PXC as a Master to StandAlone Slaves as well


Jun 07, 2013 : Percona XtraDB Cluster and MySQL Replication
Jan 29, 2014 : Native replication from Percona XtraDB Cluster to a standard stand-alone slave
Nov 24, 2014 : What is the Best way to set Disaster recovery setup for percona Xtra DB Cluster?


HEADS UP #1

Don't be surprised by replication lag in the PXC node acting as the MySQL Slave. After all, three nodes must write data and become eventually consistent before all committing changes together. See Follow these basics when migrating to Percona XtraDB Cluster for MySQL for more info.

HEADS UP #2

Since you are using MySQL 5.5, do not use PXC 5.6. Use PXC 5.5. Why ? Row-based binlogging in MySQL 5.5 can sometimes not be properly interpreted by a MySQL 5.6 mysqld process. This can break replication from MySQL 5.5 to MySQL 5.6. I wrote a post about this two months ago. The work around was to switch to binlog_format=STATEMENT, but you cannot do that for Percona XtraDB Cluster as it requires binlog_format=ROW.

MySQL 5.5 Replication to Galera/Percona XtraDB Cluster
I followed a lot of tutorials about how to extend Magento API but I didn't figure it out why I always get "Invalid api path." My goal is to extend Mage_Customer_Model_Customer_Api in order to add a new method to login a customer in site. I don't know if something like that is possible, but I need at least to be able to add a new method which just returns a message.


Can someone provide me a link where I can find a working module
which extends Magento API?
Is it possible what I want to achieve?
Thank you,


Yeee..I figured out "Invalid api path." error. Instead of calling 

$result = $client-&gt;call($session_id, 'gw_base_order.createandcapture');


it has to be

$result = $client-&gt;call($session_id, 'resource_name.createandcapture');


Wrong tuturial: Extending Magento API and others like this. 

I still need an answer for the second question.
