Best way to determine if JMS server is alive in a cluster

Can anyone give me an idea on the best way to find out if a JMS server
          in a cluster
          has failed so I can signal migration to another server in the cluster.
          Thanks Larry
          PS weblogic 7.0 sp1

Hallo Larry,
          you can go via JMX and retrieve the according RuntimeMBeans in order to
          check the health state of the
          JMSServer resp. the server hosting the JMSServer. If they are not available
          or failed you can trigger the
          migration. At least that's the way I'm doing it...
          try
          JMSServerMBean jmsServer = null;
          ServerMBean candidateServer = null;
          MigratableTargetMBean migratableTarget = null;
          * Retrieve all JMSServer defined for the current domain
          Set jmsServerSet = home.getMBeansByType("JMSServer", domainName);
          Object[] jmsServers = jmsServerSet.toArray();
          * Just the first one is picked assuming there is only one defined
          * within the active FHO domain
          if(jmsServers != null && jmsServers.length > 0)
          jmsServer = (JMSServerMBean) jmsServers[0];
          if(s_logger.isDebugEnabled())
          s_logger.debug("JMSServer: " + jmsServer.getName());
          * A JMSServer can only be associated with a single target,
          * thus pick again the first from the list.
          TargetMBean[] targets = jmsServer.getTargets();
          if(targets != null && targets.length > 0)
          boolean hostingServerRunning = false;
          boolean candidateServerRunning = false;
          * Check whether the JMSServer is really associated with
          * a migratable target. Otherwise the migration must be canceled
          * since it cannot be performed!
          if(targets[0] instanceof MigratableTargetMBean)
          migratableTarget = (MigratableTargetMBean) targets[0];
          * Retrieve all available candidates and select a running instance
          * if any. First check for constrained candidate servers, than for
          * all candidate servers
          ServerMBean[] candidates =
          migratableTarget.getConstrainedCandidateServers();
          if(candidates == null || candidates.length == 0)
          candidates = migratableTarget.getAllCandidateServers();
          if(candidates != null && candidates.length > 0)
          ServerMBean hostingServer = migratableTarget.getHostingServer();
          boolean gotHostingServer = false;
          boolean gotCandidateServer = false;
          boolean runningInstance = false;
          * Loop over all candidates as long as hosting server and candidate
          * server are visited and there running state has been determined
          for(int i=0; i< candidates.length; i++)
          ServerRuntimeMBean serverRuntime = null;
          * Retrieve the current state from the according runtime MBean
          * if available
          try
          serverRuntime = (ServerRuntimeMBean) home.getMBean(new
          WebLogicObjectName(candidates.getName(), "ServerRuntime", domainName,
          candidates[i].getName()));
          runningInstance =
          serverRuntime.getState().equalsIgnoreCase(ServerRuntimeMBean.RUNNING);
          catch(InstanceNotFoundException inf)
          * When a server instance is not available, an InstanceNotFoundException will
          be raised
          * by WLS, which can be ignored
          if(hostingServer != null && hostingServer.equals(candidates[i]))
          hostingServerRunning = runningInstance;
          gotHostingServer = true;
          else
          * A running candidate server will be prefered, thus only if no running
          * instance can be detected, another instance is selected
          if(!gotCandidateServer)
          candidateServerRunning = runningInstance;
          candidateServer = candidates[i];
          gotCandidateServer = runningInstance;
          if(gotCandidateServer && gotHostingServer)
          break;
          if(s_logger.isDebugEnabled())
          s_logger.debug("Migratable Target: " + migratableTarget.getName());
          s_logger.debug("Candidate Server: " + candidateServer.getName());
          else
          throw new Exception("JMSServer not deployed on a migratable target!");
          * Retrieve the migration service coordinator for the active domain assuming
          * there exists only one and invoke the migration later on
          MigratableServiceCoordinatorRuntimeMBean coordinator = null;
          Set coordinatorSet =
          home.getMBeansByType("MigratableServiceCoordinatorRuntime", domainName);
          Object[] coordinators = coordinatorSet.toArray();
          if(coordinators.length > 0)
          coordinator = (MigratableServiceCoordinatorRuntimeMBean) coordinators[0];
          if(enforceMigrationOnInstancesDown)
          coordinator.migrate(migratableTarget, candidateServer, hostingServerRunning,
          candidateServerRunning);
          else
          coordinator.migrate(migratableTarget, candidateServer);
          s_logger.info("Migration of JMSServer from node "
          + migratableTarget.getName()
          + " to node "
          + candidateServer.getName()
          + " has been started");
          else
          throw new Exception("MigrationServiceCoordinator cannot be retrieved");
          catch(Exception e)
          s_logger.error("Could not migrate JMSServer", e);
          Regards,
          CK
          "Larry Presswood" <[email protected]> schrieb im Newsbeitrag
          news:[email protected]...
          > Can anyone give me an idea on the best way to find out if a JMS server
          > in a cluster
          > has failed so I can signal migration to another server in the cluster.
          >
          > Thanks Larry
          >
          > PS weblogic 7.0 sp1
          >

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Only changes to orders which result in a new order or replace needing to be sent cause an action by the FIX session. There are several different mechanisms you could use to detect changes to your orders and hence decide if they need to be enqueued:
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2. Use a cache store that does the same as (1)
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5. A map listener on the order cache
The big difference between 1-3 and 4, 5 is that the CQC is i) a SPOF ii) not likely located in the same place as your order object or the queue (assuming that queue is in fact an object in another cache), iii) asynchronously fired hence introducing latency. Also note that the CQC will store your order objects locally whereas a map listener will not.
(1) and (3) will give you access to both old and new values should that be necessary for your filtering logic.
Note you must be careful not to make any re-entrant calls with any of 1-3. That means if you are adding something to a FIX queue object in another cache (say using an entry processor) then it should be on a different cache service.
snidely_whiplash wrote:
If I move to a CacheStore based setup instead of the CQC based one then any change to an order, including changes made when executions or rejects return on the FIX session will result in the store() method being called which means it will be called unnecessarily a lot. It would be nice if I could specify the CacheStore only store() certain types of changes, ie. those that would result in sending a FIX message. Anything like that possible?There is negligible overhead in Coherence calling your store() method; assuming that your code can decide if anything FIX-related needs to be done based only on the new value of the order object then this should be very fast indeed.
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Message was edited

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http://social.msdn.microsoft.com/Forums/sqlserver/en-US/eaa1eb44-729f-466b-8233-cb768fbb4208/upgrading-to-sql-server-2008-from-sql-server-2000?forum=sqlsetupandupgrade
http://social.msdn.microsoft.com/Forums/sqlserver/en-US/4fac7511-2c75-46a0-802b-807dd26b12bf/sql-2012-will-not-convert-a-sql-2000-database?forum=sqlservermigration
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http://msdn.microsoft.com/en-us/library/ms143393(v=sql.110).aspx
Please click the Mark as answer button and vote as helpful if this reply solves your problem

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I have a number of applications that run Oracle and MySQL queries via Sun Web Server 6.1. I use the Web Server's built-in connection pooling, which works fairly well.
As an interface with the connections I receive from the Web Server, I use a class, which (1) accepts the SQL and database name from a tool, (2) Opens the connection, runs the SQL, closes the connection, (3) puts the content of the result set into a Vector of Hashtables, (4) returns that Vector to the tool.
Why do I use this Vector? That way, in my applications, I don't have to deal with opening connections (or getting them from the pool) and I don't have to worry about closing connections, because that's done automatically by the interface class.
Is this a dumb approach to use? I'm a bit paranoid about open DB connections, because we have had a number of problems where connections would not be closed, go stale in oracle, and clog up the database resources.
Can you suggest a better way to (1) smartly control opening and closing connections, and (2) enabling fast database access?
Sorry, but given this Java/Sun Web Server double topic, I'm going to post the same message on the Web Server board.
Any tips?
dailysun
P.S. For instance, in my tool, I call the interface class in this manner:
Vector results_v = Database.getSelect("SELECT * FROM TEST","database1");
getSelect uses the first string as the SQL and the second string as the jndi name of the Web server's database resource. getSelect does all the context stuff to get a connection from the pool, runs the SQL, puts the resultset into a Vector of Hastables (where each row is one Hashtable), and returns the Vector.

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SQL server does not have any version named SQL server 2003 please check the version correctly it should be either SQL 2005,2008,2008 R2,2012
You can use the backup/restore to upgrade the SQL 2000 database to till SQL 2005,2008,2008R2
For SQL Server 2000 to 2012
First upgrade from SQL 2000 database to either SQL 2005, 2008 or 2008R2 and than upgrade it to SQL 2012.
http://social.msdn.microsoft.com/Forums/sqlserver/en-US/eaa1eb44-729f-466b-8233-cb768fbb4208/upgrading-to-sql-server-2008-from-sql-server-2000?forum=sqlsetupandupgrade
http://social.msdn.microsoft.com/Forums/sqlserver/en-US/4fac7511-2c75-46a0-802b-807dd26b12bf/sql-2012-will-not-convert-a-sql-2000-database?forum=sqlservermigration
And after migration to SQL 2005 or 2008, if you want to script the database than can generate scripts pick DB and check off "script all objects in the selected database".
http://blog.sqlauthority.com/2011/05/07/sql-server-2008-2008-r2-create-script-to-copy-database-schema-and-all-the-objects-data-schema-stored-procedure-functions-triggers-tables-views-constraints-and-all-other-database-objects/
You can upgrade from SQL Server 2005, SQL Server 2008, and SQL Server 2008 R2 to SQL Server 2012.
http://msdn.microsoft.com/en-us/library/ms143393(v=sql.110).aspx
Please click the Mark as answer button and vote as helpful if this reply solves your problem

Best way to copy files to server via UNIX?

Hi there!
I need to write a script for my clients to copy files to a server. What is the best method to copy a lot files to a server? I want this all handled through a UNIX tunnel.
Thank you!

spraguga wrote:
Sorry about all this as I am very unfamiliar with ssh keys. I was trying to do this in the terminal maybe I should be doing it via ARD. Currently all Clients have ARD access and SSH access active in System Preferences/Sharing. Evey client machine is authenticated with the same admin account that I use with ARD.
So should I be doing the following:
Run this on every Client machines via ARD UNIX command to create the key:
ssh-keygen -t dsa -f ~/.ssh/id_dsa -N ''
And then run this on every Client machines via ARD UNIX command to update the servers authorized_key file:
cat ~/.ssh/id_dsa.pub | ssh user@host 'cat - >> ~/.ssh/authorized_keys'
Is that it, am I missing anything?
I'm not familiar with ARD so I can't comment on that part. I can tell you that there is no need to create the keys on the clients. You can create all the keys for all the clients on a single machine - your machine. Instead of naming them "id_dsa", use something like "~/Documents/client_ssh_keys/client1". Write a script to go through and build them all in one swell foop. Then you can copy them all to the server's authorized_keys file.
You will have to copy the client1 and client1.pub files into .ssh/id_dsa and .ssh/id_dsa.pub on each client machine. It would also be a good idea to update the .ssh/known_hosts file on each client machine with the entry for the server. You can get this from your own known_hosts file. As long as you are on the client, copy your own public key into authorized_keys.
At this point, you can log in to every client machine and do so in a script, without a password. Each client can log in to the server without a password and run scripts.
Also what if the machine is logged in by another Client. Then this will not work, correct? Can I set it up so anyone who is logged into any Client machine can ssh in to the server. Would I just change the id_dsa location to root or top level of the server and client startup volumes?
SSH is an independent communication channel. No one needs to be logged in on any machine.
You can use the "-i" option on SSH to use a specific set of keys for communicating with a server. Sharing keys like that would be a significant security hole. You would definitely want to use a passphrase in that case.

What is the best way to update the remote server?

Hi,
Sorry, but this is a newbie question.
Is there a way to update your Flex app on the remote server without taking it down momentarily? Currently, if I update the app, I remove the files from the public_html folder on the server and then put the new files in their place. The site goes down while I'm making the change. Is there a better way of updating or is this the standard way?
Sorry for such a basic question.
Thanks,
-Laxmidi

If you are still using IOS 4
Connect your iPad to iTune (computer) and Check for Updates. Backup before you proceed with update.
http://i1224.photobucket.com/albums/ee374/Diavonex/Album%208/d549b56e8567252791a 1834379e59068.jpg

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