I need to build in some resilience in a web service client application. Are any of these two scenarios supported by the standard dot.net web service generated client (classic or 3.0)? Specifying a list of server addresses so that the clien can fall back automatically if one server goes down. Configuring the client so it looks up the DN...
Does anyone know how to determine the active node of a SQL Active-Passive Failover Cluster programmatically from T-SQL? @@SERVERNAME only returns the virtual server name, which is identical from both nodes. I don't plan to make any decisions based on the data - I trust the failover to do its thing - but I would like to include the info...
I have a client with a .Net 1.0 web app that uses IIS and a SQL 2000 database. It is hosted with a shared hosting service and does get not much traffic (a few visitors a day tops). The hosting has occasional downtime, of course, and the client has asked me if I can setup a redundant system to reduce downtime to negligible. What is the s...
So lets say I have an N sized server array set up like so: I have a simple JavaBean/POJO: package example; public class Person { private OtherObject obj; public void setObj(OtherObject theObj) { synchronized (this) { obj = theObj; } } public OtherObject getObj() { synchronized (this) { return obj; ...
Hi, I am developing an application that is hosted on a SQL Server 2005 failover cluster. The application (developed using C#, .Net 2.0) makes use of a number of the clustered resources (printers, file shares, etc). I would like to set up a testing environment that replicates the cluster. However, the current test environment has only...
Hi, so we're running a cluster of 2+ backend servers (happend to be JBoss servers) that are being load-balanced by an Apache 2.2. From time to time it can happen that the backend servers become unresponsive (meaning they'll wait ages to reply to a request, but don't close the connection immediately). This will naturally end up in a 502 ...
We need to build a system capable of processing 40,000 messages per second. No messages can be lost in case of any software or hardware failures. Each message size is about 2-4Kb. Processing of a message consists of validating the message, doing some simple arithmetical calculations, saving result to database and (sometimes) sending no...
A Windows endpoint booted over iSCSI blue-screens and reboots as soon as the failover target source comes up. Till that point, Windows appears to be "frozen". The blue screen codes are sometimes 0x00000f4 and sometimes 0x000007a. Now, on failover, the secondary maintains the same iqn and the source of the Windows disk is independent of t...
Hi, I'm looking at implementing an OpenID provider ('OP') using Java + Tomcat/JBoss. Now one of the key things about OpenID is that The user communicates with both the OP and the RP and has a session with both sites. The OP and RP communicate with each other to ensure the user hasn't faked anything. A subject I've not been able to ...
Well could someone provide a really simple (but not simpler than possible) explanation of transaction as applied to computing (even if copied from Wikipedia)? ...
This is what I am trying to achieve but I'm not familiar with the subject well enough, so please bear with me :) I've got a server to which some devices get connected and periodically upload some data. Communication is done over plain TCP sockets using a proprietary protocol we designed for speed and efficiency. Every such connection is...
I admit I'm a bit of a cheapskate, but I don't want to spring for the three servers needed to get automatic failover for SQL Server via Mirroring, especially since one of the three would do nothing other than be a witness server. If I set up normal SQL replication (snapshot, say) from primary server to backup server, can I just set my c...
We currently have a failover sql cluster with two nodes. For a new large project which we have determined to be business critical, our development team is requesting a new 2 node failover sql cluster. Our server department has responded saying that they do not want to implement a cluster for us, and instead employee multiple virtual ...
Hi, I'm building a client-server application and I am looking at adding failover to the client so that when a server is down it will try to connect to another available server. Are there any standards or specifications covering server failover? I'd rather adopt an existing standard than implement my own mechanism. ...
Currently I am working on failover support of an existing application. The application uses postgres to store data but does not use any special feature (view/trigger etc). The database is more of a configuration storage rather than real data storage. When the application starts, it loads the data in memory and seldom goes back to datab...
Hi All, I have a peculiar situation here. I have installed JBoss 5.1.0 as a service in Wintel box. The service will restart itself if the JBoss instance fails. However I could not find a way to test this scenario. I killed the JVM that was running the JBoss, but it did not restart the service. I need to make the JBoss service end abnor...
I have an application running on Oracle 10g using Hibernate. I am wondering if it is possible to make the application highly available with respect to database failures without any code changes on the application side, using Oracle RAC. I have two Oracle RAC nodes for the application, and ideally would like to be able to pull the plug ...
We had a consultant onsite who setup the production DB to mirror to a DR site SQL instance. Asynchronous mirroring set to mirror every minute. It has been synching to these DR site so far. I am picking up these tasks from the guy but ofcourse no knowledge transfer. So, i would like to perform certain tasks and have questions about them; ...
I am researching the possibility of using Firebird for a project. However, one potential problem is replication and failover, or rather, lack of a (subjective) "good" solution. There are several potential solutions listed in the Firebird FAQ but they are either 1) Windows-centric; 2) horribly outdated; 3) commerical; or 4) not full-f...
Does MySQL come with a built-in automatic failover? Or, are there load-balancers out there that can "detect" whether the database is alive...and if not...shoot it to the failover database? I know basic MySQL, but do not know the best way to design failover for one master DB. ...