Server wait times 2012 - Win 7 - DNS Client

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• Production Portal crashes with wait times

  Hi all
  
  
  Several times during the day, the Portal 10.1.4.0.0 crashes with wait times.
  In order to recover, the portal must be restarted.
  
  (The time-out period also took place during the time that they had a db corruption, but now that corruption has been resolved, the grip still occur.)
  
  After you run the SVU in CLEANING mode, the problem persists.
  Timeout has been defined in many more than the default value. Stall has increased also. Neither helped to solve the problem.
  
  Java portlets come from a provider of OC4J, and they are all the pages under a group of pages.
  
  These data (also the views of hollow) readings of portlets on portal schema to create the "style" and the css of the portals pages. All the instructions of database are selected, except for the rare insert on a table in their schema operation custom.
  
  Responsibility of the user:
  Access statistics indicate that about 800 users access this site in 1 hour.
  1100 users had access of user higher in an hour.
  Access by concurrent users are about 500.
  
  
  Thanks for any help.
  
  Published by: hmannila on May 11, 2010 23:50

  Hello Louis,.

  In this particular case, the EPP time-out settings are set at very high values causing depletion of the discussions of the recovery tool in the recovery EPP tool thread pool:

   
     page
     oracle.webdb.page.ParallelServlet
     
  requesttime
  120
     
     
         minTimeout
         180
     
     
         stall
         200
      
  

  This should be the course of action for you:

  >
  As you already pointed out, the portal seems to hang because Edison provider does not respond quickly enough to requests as part of the portal. Oracle Portal should be able to recover Thi in normal cases. Unfortunately, configuration in the portal settings have changed since the default values, making it almost impossible for the framework to recover from the error. To understand this, we will need to go through the theory:

  The Oracle Portal framework collects information from various sources and assemble these web pages which are then sent to the Web browser to end users. Suppliers are a source of information. To retrieve information from providers, Oracle Portal allocates a thread of so-called fetcher in OC4J_Portal. This fetcher thread will create a session with the provider (remote) and extract the content, similar to the way in which a web browser would contact a web server to retrieve an HTML page. It is important to note that Oracle Portal allocates a thread of the recovery tool for each portlet on a page. For a page containing five portlets, five threads of the recovery tool are allocated as the content is retrieved at the same time.

  In a default configuration with one OC4J_Portal process, the number of threads in the recovery tool is limited to 25. With five portlets on a page, the portal will be able to serve up to five queries simultaneously until the Fetcher thread pool is exhausted. This normally isn't a problem because the recovery tool nets are normally allocated for a few seconds. Once they have received the response from the provider, they are returned to the pool and will again be available on the portal.

  The problems start when the response from the provider becomes slow. The thread of the recovery tool is not returned to the pool immediately. Applications begin to queue until the system has more than the threads of the available recovery tool. Once there is no thread of the available recovery tool, the portal will wait for a new thread fetcher for a certain period of time (as specified by the queueTimeout). After expiry of that period of waiting for the queue, the portal will return an error on Oracle's HTTP server. This is when end users will start to encounter errors in the pages.

  To keep the portal alive and in good health, administrators should be careful that the fetcher thread pool don't get exhausted. Obviously, the best way to do this is to ensure that all suppliers to respond in a reasonable amount of time. If there is no control on the response time of the suppliers, administrators can use timeouts in the framework to ensure that queries for long durations are killed by the framework to ensure that threading of the recovery tool is returned to the pool again. These settings are configured in the Web.XML from the portal application in the OC4J container called OC4J_Portal. Of course users will see errors of time-out specific portlets on some pages but the general framework will be available. In addition, directors may decide to increase the number of threads in the recovery tool by starting more than a process of OC4J_Portal. Each additional process will increase the amount of threads fetcher with 25. However, there is a penalty of memory that each process may consume between 256 to 512 MB of memory. Administrators should only increase the amount of process when they checked the system high portal has enough free memory available to hold account of these additional processes.

  Action plan:

  1 change the values of time-out for the framework of portal to the default values:

  a. go to $ORACLE_HOME/j2ee/OC4J_Portal/applications/portal/Portal/WEB-INF
  b. copy the web.xml file:

  web.xml Web.xml_23MAR2010% cp

  c. edit the web.xml file:

  For the RepositoryServlet and the PortalServlet, remove the timeout of STALL
  For the page servlet, remove the requesttime, minTimeout, stall and queueTimeout settings

  2 increase the number of processes of OC4J_Portal from 1 to 4:

  a. create a copy of the $ORACLE_HOME/opmn/conf/opmn.xml file:

  % cp opmn.xml opmn.xml_23MAR2010

  b. open the opmn.xml file

  c. find the following section:

  d. in the section for the OC4J_Portal process, change the following line:

  TO

  3 synchronize the repository, DCM:

  % $ORACLE_HOME/dcm/bin/dcmctl updateconfig

  4 restart the process high

  % $ORACLE_HOME/opmn/bin/opmnctl stopall
  % $ORACLE_HOME/opmn/bin/opmnctl startall

  4. make sure that the changes are in force:

  a. number of OC4J_Portal process:

  Run opmnctl status and count the number of OC4J_Portal process. You should see four of them.

  b. time-out settings in OC4J_Portal

  Open the $ORACLE_HOME/j2ee/OC4J_Portal/application-deployments/portal/OC4J_Portal_default_island_1/application.log file and locate the following line at the end of the file:

  03/10/08 06:32:32 Portal: version PPE: 10.1.2.0.2 (29022008)
  03/10/08 06:32:32 Portal: setting of the parameter values: poolSize (Fetchers) = 25 [default = 25]: minTimeout (MinTimeout) = 5 s [default = 5s]: requesttime (DefaultTimeout) = 15 seconds [default = 15 s]: stall (MaxTimeout) = 65 s [default = 65]:
  queueTimeout (QueueTimeout) = 10 s [default = 10 sec] maxParallelPortlets = 20 [default = 20] maxParallelPagePortlets = 10 [default = 10]

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