Reasons for change

• XML-RPC code changes:
  • Optimization of the network bandwidth usage in overlay mode
  • More friendly for the XML-RPC servers: split long requests into smaller ones
  • More fault-tolerant and efficient: send the XML-RPC requests to a pool of servers in parallel, instead of to a single server

Test Procedure

This version has been tested on the DEV server.

Rollback procedure

Version 2.0.3 could be reinstalled

CCB Jira

SSC-102@JIRA

Details

• Code separation between Oracle and XML-RPC data retrieval methods
• XML-RPC code changes:
  • Optimization of the network bandwidth usage in overlay mode: the mnemonics are grouped into the requests (IOT-101@JIRA)
  • More memory-friendly for the XML-RPC servers: the timespan of the individual requests cannot exceed 24 hours. Larger requests are permitted, but split into smaller ones (IOT-102@JIRA). There is no limit on the length of the timespan on the client side
  • Distributed requests: instead of using 1 single XML-RPC server, we send to a pool of servers (IOT-103@JIRA). This is more friendly for the servers, and more efficient because the requests can be sent in parallel (IOT-104@JIRA), with a controlled degree of concurrency defined per server (for now: if more than 1 request for a given server is in flight, the others are queued. This can be increased later)

Stanford Linear Accelerator Center (6 issues)
T	Key	Summary	Assignee	Reporter	Pr	Status	Res	Created	Updated	Due
	IOT-106	problem in plotting "change" variables	Massimiliano Turri	Maria Elena Monzani		Resolved	FIXED	Jul 18, 2008	Jul 18, 2008
	IOT-104	xmlrpc retrieval method: send the requests in parallel when multiple servers are available and when a query involves multiple xmlrpc requests (eg. large timespans).	David Decotigny	David Decotigny		Closed	FIXED	Jul 16, 2008	Jul 17, 2008
	IOT-103	xmlrpc retrieval method: there should be a list of servers rather than a single one	David Decotigny	David Decotigny		Closed	FIXED	Jul 14, 2008	Jul 17, 2008
	IOT-102	xmlrpc retrieval method: split large timespan requests into smaller intervals	David Decotigny	David Decotigny		Closed	FIXED	Jul 14, 2008	Jul 17, 2008
	IOT-101	xmlrpc retrieval method: group the multi-mnemonics trending queries into one xmlrpc query	David Decotigny	David Decotigny		Closed	FIXED	Jul 14, 2008	Jul 17, 2008
	IOT-90	Y axis plot scales on overlay plots sometimes incorrect	Massimiliano Turri	Pat Hascall		Resolved	FIXED	Apr 24, 2008	Aug 01, 2008