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Questions tagged [complex-event-processing]

Complex event processing (CEP) consists of processing many events happening across all the layers of an organization, identifying the most meaningful events within the event cloud, analyzing their impact, and taking subsequent action in real time.

Complex event processing refers to process states, the changes of state exceeding a defined threshold of level, time, or value increment or just of a count as the event. It requires the respective event monitoring, event reporting, event recording and event filtering. An event may be observed as a change of state with any physical or logical or otherwise discriminated condition of and in a technical or economical system, each state information with an attached time stamp defining the order of occurrence and a topology mark defining the location of occurrence.

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esper aggregation count query output unexpected

I am sending city-name, company-name to esper. These queries will count occurrences of name company pair in 5 seconds: create context FiveSecondsContext start @now end after 5 seconds; context FiveSecondsContext insert into…
change
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WSO2 CEP STREAMS

I create input and output streams in my WSO2 CEP (v3.1.0) with event formatter and event builder as well. I need to find out where this streams are created in WSO2 CEP catalog structure, becasue I can't find it beyond event builder and formatter…
Kacu
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WSO2 CEP - memory leak

I have a problem about WSO2 CEP. Please advice or fix this problem. Environment is below. 1) CEP version is 2.1.0. 2) TimeBatch Window and patterns query is used. from RootStream#window.timeBatch(10000) insert into AvgOneStream avg(watt) as…
user2743651
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Overriding time used for time windows in Esper

I am working on a CEP project where I analyze logs from a file in bulk. The file is a compressed csv file that is bulk transferred over to my analytics machine every hour, where each line contains an event with a timestamp for exactly when it…
agnsaft
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WSO2 Complex Event Processor

I have a little problem with WSO2 CEP. I'm using version 3.1.0 and I have a JMS queue. So, in my queue I have a few different type of events and in CEP I have the same number of different execution plans. My question is about, how can I distinguish…
Kacu
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WSO2 CEP window time 1 day

I am evaluating different possible solution for ATM Card transaction fraud detection with input load of around 50000 per second and response time few seconds. WSO2 CEP looks better fit for overall solution, but stuck with problem of memory &…
Jigar Parekh
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Esper: Event gets sent twice?

I try to send an event with the following code but keep receiving it twice in in the registered listener. Is there maybe something wrong with the query in the listener registration or is there some other mistake I made? Thanks for any…
Chaoz77
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Esper: Best practice for enriched event

I am developing an application with Esper where I need to create a complex event from fundamental events and enrich the event with information that is stored in an external model. As I am new to Esper I was wondering if there is a better (in terms…
Chaoz77
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wso2 CEP in-built function - isMatch

I am trying to use CEP 3.1.0 with a built in function for regexp matching from cseEventStream[isMatch('foo\sbar',symbol)] which should match "foo bar" and not "foobar". However, this fails with an error mesage mismatched character '\' expecting…
zeus
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Clustering WSO2 CEP 3.1.0 in full active-active mode with more than two members?

I have followed the instructions here to cluster WSO2 CEP 3.1.0 in high availability, full active-active mode and it works great when there are two members. When I add a third member to the WKA group, all members acknowledge each other but now a…
ryanirvine
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Does Storm support temporal relationships between events?

I am looking for a way to detect events that did not happen. Example: Event B should happen within 15 minutes of event A. Esper has “time:interval” and Drools Fusion has “window:time” and “After”.
James Nordstrom
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Siddhi Distributed Cache Mode Deployment

According to the docs (https://docs.wso2.org/display/CEP310/Clustered+Deployment), you can run Siddhi in distributed mode. As fas as i understand, all nodes will share the streams definitions and operate over a shared context (streams, queries,…
user2451444
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Siddhi query with snapshots and Hazelcast Error

I'm trying to create a query with snapshot output, it works fine when distributed is disabled, but fails when distributed enabled. If i try to insert n events, it throws ArrayIndexOutOfBoundsException (n) Any idea? 14/03/26 18:54:05 INFO…
user2451444
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StreamInsight Service on Windows doesn't recognize the application dlls

I have my project worked fine with embbed stream insight instance. But when I tried to use the standardalone StreamInsight service on Windows, I got an exception when this code is run using (matchQuery.Bind(sink).Run()) An exception of type…
Vu Nguyen
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CQL substitution for "not in" subquery

I'm developing on the OCEP platform which uses CQL. I'm looking for a way to select values from one table which do not exist in another. CQL does not allow the use of sub queries so I can't simply use "not in (query)". Looking for a replacement for…
Alexei Babin
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