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Re: ServerManager-Server(-ProcessManager) communication
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created by <a href="http://community.jboss.org/people/kabir.khan%40jboss.com">Kabir Khan</a> in <i>JBoss AS7 Development</i> - <a href="http://community.jboss.org/message/561605#561605">View the full discussion</a>
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<div class="jive-rendered-content"><p>I have implemented the following but still need to test some corner cases</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><ol style="list-style-type: decimal;"><li style="margin: 0.0px 0.0px 2.0px 0.0px; font: 12.0px 'Lucida Grande'; color: #5b5b5b;">PM starts up and listens on a socket on a port (PPM) for connections from the processes it manages.</li><li style="margin: 0.0px 0.0px 2.0px 0.0px; font: 12.0px 'Lucida Grande'; color: #5b5b5b;">PM starts SM passing in PPM, PM’s host address and ‘ServerManager’ as the name<ol style="list-style-type: decimal;"><li style="margin: 0.0px 0.0px 2.0px 0.0px; font: 12.0px 'Lucida Grande'; color: #5b5b5b;">SM opens a socket on a different port (PSM) which listens for connections from the Server processes and from the Domain Controller (DC).</li><li style="margin: 0.0px 0.0px 2.0px 0.0px; font: 12.0px 'Lucida Grande'; color: #5b5b5b;">SM initiates communication with PM, by connecting to port PPM. The first command it sends is 'CONNECTED ServerManager', which helps PM associate the socket with the correct ManagedProcess.</li><li style="margin: 0.0px 0.0px 2.0px 0.0px; font: 12.0px 'Lucida Grande'; color: #5b5b5b;">For each Server configured in SM:<ol style="list-style-type: decimal;"><li style="margin: 0.0px 0.0px 2.0px 0.0px; font: 12.0px 'Lucida Grande'; color: #5b5b5b;">SM tells PM to add Server</li><li style="margin: 0.0px 0.0px 2.0px 0.0px; font: 12.0px 'Lucida Grande'; color: #5b5b5b;">SM tells PM to start Server process<ol style="list-style-type: decimal;"><li style="margin: 0.0px 0.0px 2.0px 0.0px; font: 12.0px 'Lucida Grande'; color: #5b5b5b;">PM launches the Server process, passing in PPM, PM_ADDRESS, PSM, SM_ADDRESS and the SERVER_NAME</li><li style="margin: 0.0px 0.0px 2.0px 0.0px; font: 12.0px 'Lucida Grande'; color: #5b5b5b;">Server initiates communication with PM, by connecting to port PPM. The first command it sends is 'CONNECTED <SERVER_NAME>', which helps PM associate the socket with the correct ManagedProcess.</li><li style="margin: 0.0px 0.0px 2.0px 0.0px; font: 12.0px 'Lucida Grande'; color: #5b5b5b;">Server starts listening for commands on the PM socket.</li><li style="margin: 0.0px 0.0px 2.0px 0.0px; font: 12.0px 'Lucida Grande'; color: #5b5b5b;">Server initiates communication with SM, by connecting to port PSM. The first command it sends is 'CONNECTED <SERVER_NAME>', which helps SM associate the socket with the correct Server proxy.</li><li style="margin: 0.0px 0.0px 2.0px 0.0px; font: 12.0px 'Lucida Grande'; color: #5b5b5b;">Server sends the ‘SERVER_AVAILABLE’ command on the SM socket</li><li style="margin: 0.0px 0.0px 2.0px 0.0px; font: 12.0px 'Lucida Grande'; color: #5b5b5b;">Server starts listening for commands on the SM socket</li></ol></li><li style="margin: 0.0px 0.0px 2.0px 0.0px; font: 12.0px 'Lucida Grande'; color: #5b5b5b;">SM sends the ‘START_SERVER serverConfig’ message to the server via the Server’s socket<ol style="list-style-type: decimal;"><li style="margin: 0.0px 0.0px 2.0px 0.0px; font: 12.0px 'Lucida Grande'; color: #5b5b5b;">Server parses the serverConfig, starts up and sends to SM either<ol style="list-style-type: decimal;"><li style="margin: 0.0px 0.0px 2.0px 0.0px; font: 12.0px 'Lucida Grande'; color: #5b5b5b;">‘SERVER_STARTED’ if successful.</li><li style="margin: 0.0px 0.0px 2.0px 0.0px; font: 12.0px 'Lucida Grande'; color: #5b5b5b;">‘SERVER_START_FAILED’ if failed<ol style="list-style-type: decimal;"><li style="margin: 0.0px 0.0px 2.0px 0.0px; font: 12.0px 'Lucida Grande'; color: #5b5b5b;">SM tells PM to stop process</li><li style="margin: 0.0px 0.0px 2.0px 0.0px; font: 12.0px 'Lucida Grande'; color: #5b5b5b;">If Server auto-restart=true and number retries is < respawn_policy_max SM repeats 2.3.2 and 2.3.3 <strong>- The respawn policy should be configurable (</strong><a class="jive-link-external-small" href="https://jira.jboss.org/browse/JBAS-8390"><strong>https://jira.jboss.org/browse/JBAS-8390</strong></a><strong>)</strong></li><li style="margin: 0.0px 0.0px 2.0px 0.0px; font: 12.0px 'Lucida Grande'; color: #5b5b5b;">Otherwise tell PM to remove process</li></ol></li></ol></li></ol></li></ol></li></ol></li><li style="margin: 0.0px 0.0px 2.0px 0.0px; font: 12.0px 'Lucida Grande'; color: #5b5b5b;">While a ManagedProcess is registered as started in PM<ol style="list-style-type: decimal;"><li style="margin: 0.0px 0.0px 2.0px 0.0px; font: 12.0px 'Lucida Grande'; color: #5b5b5b;">Processes are connected to the PM socket</li><li style="margin: 0.0px 0.0px 2.0px 0.0px; font: 12.0px 'Lucida Grande'; color: #5b5b5b;">The ManagedProcess monitors whether the process is still alive (with a thread doing Process.waitFor())<ol style="list-style-type: decimal;"><li style="margin: 0.0px 0.0px 2.0px 0.0px; font: 12.0px 'Lucida Grande'; color: #5b5b5b;">If a Server process goes down PM stops the process and sends ‘DOWN <SERVER_NAME>’ to SM on the PM-SM connection.<ol style="list-style-type: decimal;"><li style="margin: 0.0px 0.0px 2.0px 0.0px; font: 12.0px 'Lucida Grande'; color: #5b5b5b;">SM respawns the server process according to the rules in 2.3.3.2.</li></ol></li><li style="margin: 0.0px 0.0px 2.0px 0.0px; font: 12.0px 'Lucida Grande'; color: #5b5b5b;">If the ServerManager process goes down PM respawns it as in 6.3</li></ol></li></ol></li><li style="margin: 0.0px 0.0px 2.0px 0.0px; font: 12.0px 'Lucida Grande'; color: #5b5b5b;">To shut down a server<ol style="list-style-type: decimal;"><li style="margin: 0.0px 0.0px 2.0px 0.0px; font: 12.0px 'Lucida Grande'; color: #5b5b5b;">SM sends ‘STOP_SERVER’ to server.<ol style="list-style-type: decimal;"><li style="margin: 0.0px 0.0px 2.0px 0.0px; font: 12.0px 'Lucida Grande'; color: #5b5b5b;">Server closes down</li><li style="margin: 0.0px 0.0px 2.0px 0.0px; font: 12.0px 'Lucida Grande'; color: #5b5b5b;">Server sends ‘SERVER_STOPPED’ to SM.</li><li style="margin: 0.0px 0.0px 2.0px 0.0px; font: 12.0px 'Lucida Grande'; color: #5b5b5b;">SM tells PM to stop the Server process</li><li style="margin: 0.0px 0.0px 2.0px 0.0px; font: 12.0px 'Lucida Grande'; color: #5b5b5b;">SM tells PM to remove the Server process</li></ol></li></ol></li><li style="margin: 0.0px 0.0px 2.0px 0.0px; font: 12.0px 'Lucida Grande'; color: #5b5b5b;">Closing down everything<ol style="list-style-type: decimal;"><li style="margin: 0.0px 0.0px 2.0px 0.0px; font: 12.0px 'Lucida Grande'; color: #5b5b5b;">Message to shutdown comes from<ol style="list-style-type: decimal;"><li style="margin: 0.0px 0.0px 2.0px 0.0px; font: 12.0px 'Lucida Grande'; color: #5b5b5b;">SM gets SHUTDOWN command from DC or management interface</li><li style="margin: 0.0px 0.0px 2.0px 0.0px; font: 12.0px 'Lucida Grande'; color: #5b5b5b;">Shutdown hook in PM<ol style="list-style-type: decimal;"><li style="margin: 0.0px 0.0px 2.0px 0.0px; font: 12.0px 'Lucida Grande'; color: #5b5b5b;">Send ‘SHUTDOWN_SERVERS’ command to SM<ol style="list-style-type: decimal;"><li style="margin: 0.0px 0.0px 2.0px 0.0px; font: 12.0px 'Lucida Grande'; color: #5b5b5b;">For each server do 4 to close it down</li></ol></li><li style="margin: 0.0px 0.0px 2.0px 0.0px; font: 12.0px 'Lucida Grande'; color: #5b5b5b;">PM sends 'SHUTDOWN' message to SM which closes down SM as in 6</li></ol></li></ol></li></ol></li><li style="margin: 0.0px 0.0px 2.0px 0.0px; font: 12.0px 'Lucida Grande'; color: #5b5b5b;">Restarting SM<ol style="list-style-type: decimal;"><li style="margin: 0.0px 0.0px 2.0px 0.0px; font: 12.0px 'Lucida Grande'; color: #5b5b5b;">SM process is stopped by<ol style="list-style-type: decimal;"><li style="margin: 0.0px 0.0px 2.0px 0.0px; font: 12.0px 'Lucida Grande'; color: #5b5b5b;">Message from DC</li><li style="margin: 0.0px 0.0px 2.0px 0.0px; font: 12.0px 'Lucida Grande'; color: #5b5b5b;">Process is killed</li></ol></li><li style="margin: 0.0px 0.0px 2.0px 0.0px; font: 12.0px 'Lucida Grande'; color: #5b5b5b;">SM is down...</li><li style="margin: 0.0px 0.0px 2.0px 0.0px; font: 12.0px 'Lucida Grande'; color: #5b5b5b;">SM process is started<ol style="list-style-type: decimal;"><li style="margin: 0.0px 0.0px 2.0px 0.0px; font: 12.0px 'Lucida Grande'; color: #5b5b5b;"><strong> </strong>PM starts SM passing in PPM, PM’s host address and ‘ServerManager’ as the name along with the -restarted-server-manager flag. </li><li style="margin: 0.0px 0.0px 2.0px 0.0px; font: 12.0px 'Lucida Grande'; color: #5b5b5b;">See 2.1</li><li style="margin: 0.0px 0.0px 2.0px 0.0px; font: 12.0px 'Lucida Grande'; color: #5b5b5b;">See 2.2</li><li style="margin: 0.0px 0.0px 2.0px 0.0px; font: 12.0px 'Lucida Grande'; color: #5b5b5b;">SM sends the ‘RECONNECT_SERVERS <SM_ADDRESS> <PSM>’ command to PM<ol style="list-style-type: decimal;"><li style="margin: 0.0px 0.0px 2.0px 0.0px; font: 12.0px 'Lucida Grande'; color: #5b5b5b;">For each Server process PM sends ‘RECONNECT_SERVER_MANAGER <SM_ADDRESS> <PSM>’<ol style="list-style-type: decimal;"><li style="margin: 0.0px 0.0px 2.0px 0.0px; font: 12.0px 'Lucida Grande'; color: #5b5b5b;">Server reconnects to SM as in 2.3.2.4</li><li style="margin: 0.0px 0.0px 2.0px 0.0px; font: 12.0px 'Lucida Grande'; color: #5b5b5b;">Server sends ‘SERVER_RECONNECT_STATUS <Current_State>’ to SM<ol style="list-style-type: decimal;"><li style="margin: 0.0px 0.0px 2.0px 0.0px; font: 12.0px 'Lucida Grande'; color: #5b5b5b;">if the server is not in the starting, started, stopping or stopped state (I added some basic state management) SM does 2.3.3 </li></ol></li></ol></li></ol></li></ol></li></ol></li></ol></div>
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