[teiid-issues] [JBoss JIRA] (TEIID-5415) Simplify connection handling

[Steven Hawkins (JIRA)]

Steven Hawkins created TEIID-5415:
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             Summary: Simplify connection handling
                 Key: TEIID-5415
                 URL: https://issues.jboss.org/browse/TEIID-5415
             Project: Teiid
          Issue Type: Quality Risk
          Components: JDBC Driver
            Reporter: Steven Hawkins
            Assignee: Steven Hawkins
             Fix For: 11.x


With the removal of TEIID-5411 we can further simplify our notion of connection handling.  The current logic maintains a set of logins for known server instances under one logical connection.  When a connection is returned to an XA pool (or the client issues special sql) the logical connection will select a new instance using a cached login if possible.  

The benefits of the current approach are:

* works just from the hosts listed in the url
* works with XA connection pooling or connection pooling in general with additional setup to provide simple load balancing

The drawbacks are:
* creates a set of logins which may mostly sit idle
* is not load balancer aware - for example when just a load balanced end point is used.  And the load balancing is just random, not intelligent.
* requires the client to keep a pool of physical connections

A proposal would be to keep multiple url failover, but removal all of the logic related to maintaining multiple logins under a logical connection.





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