For optimal throughput, consider performing such blocking operations in a separate thread.Īdditionally, when reading input events from a store or network in a performance test, you may find that Esper processes events faster then you are able to feed events into Esper. It can therefore be beneficial for your application to process output events asynchronously and not block the Esper engine while an output event is being processed by your listener, especially if your listener code performs blocking IO operations.įor example, your application may want to send output events to a JMS destination or write output event data to a relational database. The processing of output events that your listener or subscriber performs temporarily blocks the thread until the processing completes, and may thus reduce throughput. Such output events are delivered by the application or timer thread(s) that sends an input event into the engine instance. Your application receives output events from Esper statements through the UpdateListener interface or via the strongly-typed subscriber POJO object. This section describes performance best practices and explains how to assess Esper performance by using our It is also possible to use Esper on a soft-real-time or hard-real-time JVM to maximize predictability even How to Use the Performance KitĮsper has been highly optimized to handle very high throughput streams with very little latency between event receipt and output result posting. Measure throughput of non-matches as well as matches 23.3. Incremental Versus Recomputed Aggregation for Named Window Events 23.2.39. Comparing Single-Threaded and Multi-Threaded Performance 23.2.38. Do Not Create the Same or Similar EPL Statement X Times 23.2.37. Query Planning Expression Analysis Hints 23.2.34. Prefer Constant Variables Over Non-Constant Variables 23.2.30. Context Partition Related Information 23.2.29. Expression Evaluation Order and Early Exit 23.2.26. Statement and Engine Metric Reporting 23.2.25. Optimizing Stream Filter Expressions 23.2.24. Performance, JVM, OS and Hardware 23.2.22. Statement Design for Reduced Memory Consumption - Diagnosing OutOfMemoryError 23.2.21. Pattern Sub-Expression Instance Versus Data Window Use 23.2.19. Patterns and Pattern Sub-Expression Instances 23.2.18. Subqueries Versus Joins and Where-Clause and Data Windows 23.2.17. High-Arrival-Rate Streams and Single Statements 23.2.16. Use a Subscriber Object to Receive Events 23.2.14. Tune or Disable Delivery Order Guarantees 23.2.13. Consider Casting the Underlying Event 23.2.11. Consider Using EventPropertyGetter for Fast Access to Event Properties 23.2.10. Reduce the Use of Arithmetic in Expressions 23.2.7. Prefer Stream-Level Filtering Over Where-Clause Filtering 23.2.6. Select the Underlying Event Rather Than Individual Fields 23.2.5. Understand How to Tune Your Java Virtual Machine 23.2.2. award any 5-run Penalty that is applicable except for Penalty runs under Law 28.3 (Protective helmets belonging to the fielding side).23.1. signal No ball to the scorers if applicable return any not out batter to his/her original end If the ball does not become dead for any other reason, the umpire shall call and signal Dead ball as soon as the ball reaches the boundary or at the completion of the first run. If in the circumstance of 23.2.1 the umpire considers that neither of the conditions therein has been met, then Leg byes shall not be awarded. Or only inadvertent contact with the striker’s bat or personĪny runs completed by the batters or a boundary allowance shall be credited to the striker in the case of subsequent contact with his/her bat but otherwise to the batting side as in 23.2.3.Ģ3.2.2.2 If the striker wilfully makes a lawful second strike, Laws 34.3 (Ball lawfully struck more than once) and 34.4 (Runs permitted from ball lawfully struck more than once) shall apply.Ģ3.2.3 The runs in 23.2.2.1, unless credited to the striker, shall be scored as Leg byes.Īdditionally, if the delivery is a No ball, the one run penalty for the No ball shall be incurred. Additionally, if the delivery is a No ball, the one run penalty for such a delivery shall be incurred.Ģ3.2.1 If a ball delivered by the bowler first strikes the person of the striker, runs shall be scored only if the umpire is satisfied that the striker hasĮither attempted to play the ball with the batĢ3.2.2 If the umpire is satisfied that either of these conditions has been met runs shall be scored as follows.Įither no subsequent contact with the striker’s bat or person, If the ball, delivered by the bowler, not being a Wide, passes the striker without touching his/her bat or person, any runs completed by the batters from that delivery, or a boundary allowance, shall be credited as Byes to the batting side.
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