Public Member Functions | |
| RAIDb1_LPRF (VirtualDatabase vdb, WaitForCompletionPolicy waitForCompletionPolicy) throws Exception | |
| ControllerResultSet | execReadRequest (SelectRequest request, MetadataCache metadataCache) throws SQLException |
| ControllerResultSet | execReadOnlyReadStoredProcedure (StoredProcedure proc, MetadataCache metadataCache) throws SQLException |
| String | getInformation () |
| String | getRaidb1Xml () |
The read requests coming from the Request Manager are sent to the node that has the least pending read requests among the nodes that can execute the request. Write requests are broadcasted to all backends.
Definition at line 54 of file RAIDb1_LPRF.java.
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Creates a new RAIDb-1 Round Robin request load balancer.
Definition at line 75 of file RAIDb1_LPRF.java. 00077 {
00078 super(vdb, waitForCompletionPolicy);
00079 }
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Selects the backend using a least pending request first policy. The backend that has the shortest queue of currently executing queries is chosen to execute this stored procedure.
Implements org.objectweb.cjdbc.controller.loadbalancer.AbstractLoadBalancer. Definition at line 107 of file RAIDb1_LPRF.java. 00109 {
00110 return executeLPRF(proc, false, "Stored procedure ", metadataCache);
00111 }
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Selects the backend using a least pending request first policy. The backend that has the shortest queue of currently executing queries is chosen to execute this query.
Implements org.objectweb.cjdbc.controller.loadbalancer.raidb1.RAIDb1. Definition at line 93 of file RAIDb1_LPRF.java. 00095 {
00096 return executeLPRF(request, true, "Request ", metadataCache);
00097 }
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Gets information about the request load balancer.
Implements org.objectweb.cjdbc.controller.loadbalancer.AbstractLoadBalancer. Definition at line 245 of file RAIDb1_LPRF.java. 00246 {
00247 // We don't lock since we don't need a top accurate value
00248 int size = vdb.getBackends().size();
00249
00250 if (size == 0)
00251 return "RAIDb-1 Least Pending Request First load balancer: !!!Warning!!! No backend nodes found\n";
00252 else
00253 return "RAIDb-1 Least Pending Request First load balancer (" + size
00254 + " backends)\n";
00255 }
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Implements org.objectweb.cjdbc.controller.loadbalancer.raidb1.RAIDb1. Definition at line 260 of file RAIDb1_LPRF.java. 00261 {
00262 return "<" + DatabasesXmlTags.ELT_RAIDb_1_LeastPendingRequestsFirst + "/>";
00263 }
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1.3.9.1