Hi, On Tue, Oct 14, Dennis Plöger | getit GmbH wrote: > Hi there! > > I'm currently trying to create a completely high available setup for the > Hybris platform (http://hybris.com/). Hybris is a Spring-based framework for > e-commerce sites, that is running on Tomcat and connecting via a JDBC pool to > different databases, MySQL being one. > > So I've set up two MySQL nodes using a Percona cluster and HAProxy on the > application server node to proxy requests to one or both of the database > nodes. (I've tried Active/Active and Active/Passive setups)
(You might consider running garbd arbitrator on a third server (or a third node), because if the two pxc nodes loose connection between each other -> split brain and both nodes won't work http://www.percona.com/blog/2012/07/25/percona-xtradb-cluster-failure-scenarios-with-only-2-nodes/) > Everything works quite fine, but during the high-load initialization process, > the JDBC connections in the pool somehow seem to timeout or loose connection > to the databse. These exceptions pop up: Do you get any errors if you use direct jdbc connection from hybris to your PXC nodes (no haproxy in between) ? Have you enabled logging in haproxy and do you get any errors in haproxy logs ? > INFO | jvm 1 | main | 2014/10/14 15:59:45.362 | ... 4 more > INFO | jvm 1 | main | 2014/10/14 15:59:45.362 | Caused by: > java.io.EOFException: Can not read response from server. Expected to read 4 > bytes, read 0 bytes before connection was unexpectedly lost. > INFO | jvm 1 | main | 2014/10/14 15:59:45.362 | at > com.mysql.jdbc.MysqlIO.readFully(MysqlIO.java:2914) > INFO | jvm 1 | main | 2014/10/14 15:59:45.362 | at > com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:3337) > INFO | jvm 1 | main | 2014/10/14 15:59:45.362 | ... 35 more What kind of server / client timeouts do you use in haproxy or are you reaching maxconn etc. limits ? -Jarno > I've been using version 1.4 from the Ubuntu repository and already updated to > current 1.5, in which these exceptions come at a later point during the > intialization process, however they still exist. > > Can anybody help me here? How can I better debug this? Do you need any more > data to help? > > Thank you in advance. > > Kind regards > Dennis > -- Jarno Huuskonen
