Other Clustered Services in .NET framework

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With the JDBC/RMI driver it is possible to obtain load balancing and failover capabilities for JDBC connections This is based on a DataSource object, which defines the connection to the database and can be registered in the replicated naming tree When a client looks up a data source object with JNDI, the load balancing and failover logic described earlier is used to select a server in the cluster that will handle the requested connection Once a connection is obtained, it will be pinned to that server in order to maintain the database context
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At the time of writing, the engineering group of WebLogic are working on a version of clustering that can load balance JMS A future version will also be able to handle failover
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At the time of writing the WebLogic clustering fully supports stateless session beans The tests for this section will be limited to using the code developed in the first section of 4, which uses stateless beans
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Using the same configuration of the test environment as for the previous tests in this chapter, the Troops are ready to test the code based on the stateless session beans
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Test Series 1221 - Two Servers
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Similar to the previous tests, the first set of tests will use only two machines, each running one instance of WebLogic The setup is analogous to the test series 1211, but deploying the code for 4a
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Test 12211 - 200 Users
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The Troops changed the test scripts in the Grinder to conform to the requirements of the stateless session bean version of the application They then started testing with 200 simultaneous users The results of this run are: Test 12211 url0 urll url2 url3 url4 url5 url6 url7 url8 url9 Total
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ART TPS
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7988 1639 8404 13788 20273 34484 54425 57325 52066 2138 252529
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1252 6102 1190 725 493 290 184 174 192 4678
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In comparison to the test in 11 (Test 1135), the results are dramatically better, from a response time of almost 34 seconds to 25 seconds This seems to make sense if you consider that each server is working with 100 simultaneous users The response time for this test is in between the response times for the tests of 60 and 120 users with the single server
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12
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In the screenshot of the console presented you can see that both servers behave similarly:
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It is interesting to also note that the database is very busy, presenting a load level close to where there were failures in the previous set of runs This can be seen below:
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Grinding in a Cluster
Test 12212 - 280 Users
For this test the Troops increased the user load to 280 After seeing the load that Maria was having in the last run it comes as no surprise that there are errors on this test In this case there were only two errors caused by the database not responding The results are: Test 12212 url0 urll url2 url3 url4 url5 url6 url7 url8 url9 Total
ART TPS
6047 1687 8752 15412 33115 76771 123145 139215 187952 4371 596465
1654 5929 1143 649 302 130 081 072 053 2288 017
This response time represents an increase of 136% over the previous run We have already seen that this particular version of the application does not scale very well in the single machine tests For those tests the maximum number of users it could handle was 200, Here it is doing a much better job with 280 users, but it is getting close to overrunning the database given the errors it has produced With a high CPU usage on the two servers running WebLogic, as presented below, the database almost reached 100% on the peak of the third cycle