Tales From the Web Logic Front Line

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C2B2 Consulting

Presentation by Steve Millidge

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Tales from the WebLogic Front Line(What NOT to do with WebLogic) Steve Millidge C2B2 Consulting Limited

Agenda Health Warning Setting the Scene Common Anti-patterns Ain’t misbehaving This could kill

C2B2 Consulting Fast Performance and Scalability Reliable High Availability and Recoverability Manageable Monitoring and Supporting Secure Security

Philosophy Don’t Panic you didn’t #@#@ it up. Suspect Configuration over Coding Suspect bespoke code over WebLogic code WebLogic is FAST Computers are Logical and Rational

Too Many Datasources Data Source per Component All to the Same Database JNDI Name per Component C1 C1 C1 DS1 DS1 DS1 Oracle

Why It’s Bad Requires XA for all Datasources Developers receive strange “XA” exception Untick Honour Global Transactions Makes Exception “go away” Datasources now in autocommit DATA CORRUPTION!! Requires more DB connections BIND same Datasource to multiple JNDI locations

Inadvertent TX Coupling WLS 1 WLS 2 EJB 1 REQUIRED Invoke EJB 2 REQUIRED Oracle 1 Oracle 2

Why It’s BAD Results in “Strange Exceptions” if not All XA Is the REALLY what you want XA is very heavyweight And not guaranteed XA requires particular database configuration You have 4 minimum XA resources to coordinate Fix using REQUIRES NEW

WLS Cluster WLS Session Clustering WLS 1 WLS 2 WLS 3 WLS 4 1 2 Don’t Use the Session as a Cache USE A CACHE

Too Much Logging Too Synchronized New Application 30% Slower Tx Timeouts High CPU Many Threads waiting on Logging Monitor Debug turned on, on one node In Memory Buffer Each Thread Logged to in memory queue Writer thread writes messages to file Under heavy load memory queues grew unbounded 1.5Gb heap in log messages

Session Shenanigans Serialization Session Attributes must be Serializable See this one all the time No Failover!!! Working as per Spec No Put You must Put dirtied objects back in the Session Don’t Get modify then no Put No Failover!!! Working as per Spec

Exceptions and TX What happens to the TX when you throw an Exception from an EJB method? Application ExceptionCommit System ExceptionRollback

Poisoned JMS Eats CPU Prevents Delivery Kills Server Performance JMS Q RepeatForever Set Redeliver Delay Set Redelivery Limit Set Error Destination Exception

Poisoned JMS (Paging) WLS Keeps Messages in Memory Causes OutOfMemory Exceptions Configure Paging Thresholds Configure at JMS Server level

Too Much RAM -XMS2G –XMX2G 32 bit Can be Too Much O/S Reserves RAM VM Starts up When you need it! HOTSPOT DUMP

Node Manager Configuration Not Good Out of the Box Auto Kill If Failed = TRUE Auto Restart = TRUE Restart Delay should be set Restart Max should be set Set Panic Action to System.exit

Disappearing Datasource Start WebLogic when DB not Available Datasource is not created Connection Creation Retry Frequency Seconds should be non-zero

Summary Production Configuration is Complex Call in the Professionals

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Tales From the Web Logic Front Line

1. Tales from the WebLogic Front Line(What NOT to do with WebLogic) Steve Millidge C2B2 Consulting Limited

2. Agenda Health Warning Setting the Scene Common Anti-patterns Ain’t misbehaving This could kill

3. C2B2 Consulting Fast Performance and Scalability Reliable High Availability and Recoverability Manageable Monitoring and Supporting Secure Security

4. First Day At Work

5. It’s All Gone to *#*@!

8. Meet the Project Manager

10.

11. Philosophy Don’t Panic you didn’t #@#@ it up. Suspect Configuration over Coding Suspect bespoke code over WebLogic code WebLogic is FAST Computers are Logical and Rational

12. Common Anti-patterns

13. Too Many Datasources

14. Too Many Datasources Data Source per Component All to the Same Database JNDI Name per Component C1 C1 C1 DS1 DS1 DS1 Oracle

15. Why It’s Bad Requires XA for all Datasources Developers receive strange “XA” exception Untick Honour Global Transactions Makes Exception “go away” Datasources now in autocommit DATA CORRUPTION!! Requires more DB connections BIND same Datasource to multiple JNDI locations

16. Inadvertent TX Coupling

17. Inadvertent TX Coupling WLS 1 WLS 2 EJB 1 REQUIRED Invoke EJB 2 REQUIRED Oracle 1 Oracle 2

18. Why It’s BAD Results in “Strange Exceptions” if not All XA Is the REALLY what you want XA is very heavyweight And not guaranteed XA requires particular database configuration You have 4 minimum XA resources to coordinate Fix using REQUIRES NEW

19. Clustering is TOO Heavy

20. WLS Cluster WLS Session Clustering WLS 1 WLS 2 WLS 3 WLS 4 1 2 Don’t Use the Session as a Cache USE A CACHE

21. Too Much logging

22. Too Much Logging Too Synchronized New Application 30% Slower Tx Timeouts High CPU Many Threads waiting on Logging Monitor Debug turned on, on one node In Memory Buffer Each Thread Logged to in memory queue Writer thread writes messages to file Under heavy load memory queues grew unbounded 1.5Gb heap in log messages

23. Ain’tMisbehavin’

24. Session Shenanigans Serialization Session Attributes must be Serializable See this one all the time No Failover!!! Working as per Spec No Put You must Put dirtied objects back in the Session Don’t Get modify then no Put No Failover!!! Working as per Spec

25. Exceptions and TX What happens to the TX when you throw an Exception from an EJB method? Application ExceptionCommit System ExceptionRollback

26. Poisoned JMS

27. Poisoned JMS Eats CPU Prevents Delivery Kills Server Performance JMS Q RepeatForever Set Redeliver Delay Set Redelivery Limit Set Error Destination Exception

28. Poisoned JMS (Paging) WLS Keeps Messages in Memory Causes OutOfMemory Exceptions Configure Paging Thresholds Configure at JMS Server level

29. This Can Kill You

30. Too Much RAM -XMS2G –XMX2G 32 bit Can be Too Much O/S Reserves RAM VM Starts up When you need it! HOTSPOT DUMP

31. Node Manager Configuration Not Good Out of the Box Auto Kill If Failed = TRUE Auto Restart = TRUE Restart Delay should be set Restart Max should be set Set Panic Action to System.exit

32. Disappearing Datasource Start WebLogic when DB not Available Datasource is not created Connection Creation Retry Frequency Seconds should be non-zero

33. Summary Production Configuration is Complex Call in the Professionals

34. Example Bullet Slide Bullet 1

Editor's Notes

These are things we’ve seen people do a lot which you shouldn’t do.
We see many examples of lots and lots of datasources

Tales From the Web Logic Front Line

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Editor's Notes