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JAVA Cluster Architecture • All Java components of an SAP system are known as a Java cluster. A Java cluster consists of: – A (central) Java instance with a dispatcher and at least one server process. – The Central Services, which contain a message server and an enqueue server. – A database for the central storage of data. – Optionally, additional Java instances • A minimal cluster installation and an installation with multiple SAP NetWeaver AS Java instances are shown as examples in the following figures. Minimal cluster • Cluster with Multiple Instances 18 October 2010
Request Processing by the dispatcher • Client requests to SAP NetWeaver AS Java are received by the Java dispatcher. It selects a free server process to process the request and creates the connection between the client and the server process. The dispatcher distributes new incoming requests to the available server processes using a .round robin. algorithm. If there is already a connection to the client, the request is forwarded to the server process that is already processing requests for this client. The individual steps in the processing of a request are outlined in the following figure. 18 October 2010
Page 1 and 2: SAP BASIS Introductory Training Pro
Page 3 and 4: AS JAVA Architecture & Processes 18
Page 5 and 6: SAP AS JAVA Instance Central Instan
Page 7 and 8: Summary of AS JAVA Processes The fo
Page 9 and 10: AS JAVA Architecture • In AS Java
Page 11 and 12: Key architecture principles of Dual
Page 13 and 14: Details on request processing • T
Page 15 and 16: Transaction Processing in AS JAVA 1
Page 17 and 18: Details on Managers & Services •
Page 19 and 20: Open SQL for JAVA • If the Java p
Page 21: The JAVA Instance Concept • SAP N
Page 25 and 26: Message & Enqueue Service • The m
Page 27 and 28: Services in the AS JAVA • The ser
Page 29 and 30: Startup & Shutdown Of AS JAVA Insta
Page 31 and 32: Sequence of Startup • The SAP Sys
Page 33 and 34: Stopping AS JAVA in UNIX • The st
Page 35 and 36: Starting/Stopping a pure AS JAVA in
Page 37 and 38: Process Information 18 October 2010
Page 39 and 40: SMICM Details • In the case of SA
Page 41 and 42: Start/Stop in UNIX • For SAP syst
Page 43 and 44: Details on the Framework • SAP pr
Page 45 and 46: Location in Windows 18 October 2010
Page 47 and 48: JCMON Tool • The JCmon tool can b
Page 49 and 50: Logs & Trace Files in AS JAVA 18 Oc
Page 51 and 52: Administration & Configuration Tool
Page 53 and 54: Features of the Config Tool • The
Page 55 and 56: Visual Administrator • With the V
Page 57 and 58: Memory Management in AS JAVA • Th
Page 59 and 60: Explanation of the Term “Generati
Page 61 and 62: Exercise EXERCISE • Login to the

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