siddhi | Stream Processing and Complex Event Processing Engine | Stream Processing library

 by   siddhi-io Java Version: 4.5.11 License: Apache-2.0

kandi X-RAY | siddhi Summary

kandi X-RAY | siddhi Summary

siddhi is a Java library typically used in Telecommunications, Media, Media, Entertainment, Data Processing, Stream Processing, Docker applications. siddhi has no bugs, it has no vulnerabilities, it has build file available, it has a Permissive License and it has high support. You can download it from GitHub, Maven.
Siddhi can run as an embedded Java and Python library, as a micro service on bare metal, VM, and Docker and natively in Kubernetes. Siddhi provides web-based graphical and textual tooling for development. For information on Siddhi and it’s features refer Siddhi Documentation.

            kandi-support Support

              siddhi has a highly active ecosystem.
              It has 1426 star(s) with 509 fork(s). There are 120 watchers for this library.
              It had no major release in the last 12 months.
              There are 103 open issues and 367 have been closed. On average issues are closed in 118 days. There are 3 open pull requests and 0 closed requests.
              It has a positive sentiment in the developer community.
              The latest version of siddhi is 4.5.11

            kandi-Quality Quality

              siddhi has 0 bugs and 0 code smells.

            kandi-Security Security

              siddhi has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.
              siddhi code analysis shows 0 unresolved vulnerabilities.
              There are 0 security hotspots that need review.

            kandi-License License

              siddhi is licensed under the Apache-2.0 License. This license is Permissive.
              Permissive licenses have the least restrictions, and you can use them in most projects.

            kandi-Reuse Reuse

              siddhi releases are available to install and integrate.
              Deployable package is available in Maven.
              Build file is available. You can build the component from source.
              Installation instructions, examples and code snippets are available.
              siddhi saves you 147975 person hours of effort in developing the same functionality from scratch.
              It has 157400 lines of code, 8264 functions and 1070 files.
              It has high code complexity. Code complexity directly impacts maintainability of the code.

            Top functions reviewed by kandi - BETA

            kandi has reviewed siddhi and discovered the below as its top functions. This is intended to give you an instant insight into siddhi implemented functionality, and help decide if they suit your requirements.
            • Build the collection executor
            • Parse an expression
            • Create a CompiledCondition .
            • Build the variable executors .
            • Generate database query .
            • Construct output callback .
            • Add event sink .
            • Adds extension meta data into namespace list .
            • Restore incremental snapshot information .
            • Generate a compiled selection
            Get all kandi verified functions for this library.

            siddhi Key Features

            Stream Processing and Complex Event Processing Engine

            siddhi Examples and Code Snippets

            copy iconCopy
                    while (true) {
                            String  data = (String) linkedBlockingQueue_A.take();
                            // parsing the data
                            String[] tupleData =  data.split(",");
                            Integer sensor_id = Integer.valueOf(

            Community Discussions


            Get the both numbers in the bracket of a string Regex Python
            Asked 2022-Apr-09 at 04:01

            I have my 'cost_money' column like this,



            Answered 2022-Apr-09 at 03:51

            You can use (\d*-\d*) to match the number part and then split on -.



            How create a siddhi app with Multiple conditional count
            Asked 2021-Aug-23 at 06:12

            I have a special situation and I can not implement it with siddhi options like window, pattern or aggregation functions. The data comes from 2 streams, I set the source in both streams of KAFKA and I set the list of topics in siddhi source p1, p2. I wrote a query for checks 2 rules (type = "h") and (type = "g"). The siddhi app must only allows events to match these conditions. I need to aggregate every 10 seconds, when the number of events that match the first condition is 2 and the number of events that match the second condition is 5 at this time. How?



            Answered 2021-Aug-22 at 11:03

            Finally found the solution:



            Not able to process kafka json message with Flink siddhi library
            Asked 2021-May-25 at 10:00

            I am trying to create a simple application where the app will consume Kafka message do some cql transform and publish to Kafka and below is the code:

            JAVA: 1.8 Flink: 1.13 Scala: 2.11 flink-siddhi: 2.11-0.2.2-SNAPSHOT

            I am using library:

            input json to Kafka:



            Answered 2021-May-25 at 07:59

            Initial guess: if you are using even time, are you sure you have defined watermarks correctly? As stated in the docs:

            (...) an incoming element is initially put in a buffer where elements are sorted in ascending order based on their timestamp, and when a watermark arrives, all the elements in this buffer with timestamps smaller than that of the watermark are processed (...)

            If this doesn't help, I would suggest to decompose/simplify the job to a bare minimum, for example just a source operator and some naive sink printing/logging elements. And if that works, start adding back operators one by one. You could also start by simplifying your CEP pattern as much as possible.



            JMeter: Performance testing of two different Thread Pools and their comparison
            Asked 2021-May-06 at 08:04

            My question is different from this as it is too old and there may be new JMeter Plugins.
            I have two Java Classes Server1 and Server2.
            Server1 class extends ThreadPoolExecutor.
            Server2 class extends WaterMarkExecutor
            User can connect to any of these Servers through Socket and submit Runnable Objects( that calculate some Random number).These Runnable objects are send back to the client as responses. For each Runnable Object i am calculating its resonse time and the wait-time it did in the queue of thread pool. Each Server is exposing me its Pool size and throughput after every second. I want to display and compare the performance statistics of these two servers in charts.
            Instead of develping my own library for this, i want to use JMeter.
            I want JMeter to
            1)connect to Server1
            2)send Runnable objects at specific rate
            3)receive executed Runnable objects back from Server1 (as responses).
            4)display the response time and wait(in queue) of each received Runnable object on Charts.
            5) Display throughput and pool size of Server 1 on separate charts.
            6)then i want to use the same experiment(workload etc) on Server 2 and want JMeter to compare the performance of two servers.
            Now my questins are
            (1) Is it easy to use JMeter for this scenario? or i should switch to some testbed(or any other tool)?
            (2)suggest me some useful links of JMeter that can guide me to do this.



            Answered 2021-May-06 at 08:04

            From your problem statement - it looks like you have got a server application with which clients can interact by sending java objects using serialization binary protocol. Jmeter is generally not used for such testing as it generally caters to other well known protocols like http, jms, ftp etc. There are readily available samplers for these. However if you want to use java serilization your best bet it to perhaps use java sampler to write own request sending/response recieving code or to use a commercial plugin ( available for trial) like this.

            Other alternative is to perhaps write your own test application and use statistics from there to create visualizations.



            [siddhi]How Can I use siddhi stream in multi files
            Asked 2020-Dec-09 at 06:21

            I met a problem when I use siddhi, the problem is that I have too much streams in one .siddhi file.The siddhql looks terrible and it's hard to mainten. Does Anyone know how can I put siddhi streams in diffrent siddhi files? And these streams in diffrent files still can send info to stream in other file.Please help. Thanks for your time



            Answered 2020-Dec-09 at 06:21

            Yes, you can use Inmemory source and sinks to send events between two different siddhi files i.e two different siddhi app runtimes,



            error while loading geo location based invocations in wso2
            Asked 2020-Oct-05 at 03:18

            I configured geo location based statistics according to the documentation for api manager and in the analytics dashboard i added the "GEO LOCATION BASED INVOCATIONS" widget.but when i select the api name it stuck and does not load anything: enter image description here

            also in the dashboard console i got the following error:



            Answered 2020-Oct-05 at 03:18

            If you are creating a new dashboard or adding this widget to an existing dashboard make sure to add the "Date Time Range" widget to the current page if it is not. Then subscribe "GEO LOCATION BASED INVOCATIONS" widget to the "Date Time Range" widget. "Date Time Range" provide the time durations to the other widgets. Looks like it failed due to lack of this widget.



            WSO2 Streaming Integrator - Aggregate multiple events into one event
            Asked 2020-Sep-16 at 12:09

            I have a requirement to collect multiple events into a single one and consider it as a single event. The output stream should include the input events as a list.

            Basically, when the following events are passed



            Answered 2020-Sep-16 at 12:09

            Do not use partitions, as this is a simple use case, try windows. Time batch windows in your case,



            is there a way in siddhi to store app session data?
            Asked 2020-Aug-17 at 19:47

            I have input stream InputStream taking input from Kafka. Then I use this stream to call HTTP API. In HTTP call response, I have to send results to another Kafka topic using OutputStream

            app flow
            InputStream (have userId) => RequestHttpStream => ResponseHTTPStream (dont have userId) => OutputStream (need userId here)

            The problem is, i need userId to send event to OutputStream but the response HTTP stream ResponseHTTPStream don't have notion of userId. So I am looking for ways in siddhi to store and retrieve some key/values mapping. I read about tables in siddhi but seems like it's shared between all events. What I need is kind of like an app session data which only exists for that session only. Can I use partitions for this?




            Answered 2020-Aug-17 at 19:47

            Your use case is to keep an attribute between http-call sink and http-call-response source. This can be achieved by using transport properties. Since the attributes in the sink can be accessed in the source by referring to trp:



            Can Someone help me to solve this issue in Siddhi Stream Processor?
            Asked 2020-May-17 at 01:56
            [2020-05-06_16-31-42_744] ERROR {com.zaxxer.hikari.pool.HikariPool} - HikariPool-32 - Exception during pool initialization. 
            java.sql.SQLException: The server time zone value 'unknown' is unrecognized or represents more than one time zone. You must configure either the server or JDBC driver (via the 'serverTimezone' configuration property) to use a more specifc time zone value if you want to utilize time zone support.
                at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(
                at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(
                at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(
                at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(
                at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(
                at com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping.translateException(
                at com.mysql.cj.jdbc.ConnectionImpl.createNewIO(
                at com.mysql.cj.jdbc.ConnectionImpl.(
                at com.mysql.cj.jdbc.ConnectionImpl.getInstance(
                at com.mysql.cj.jdbc.NonRegisteringDriver.connect(
                at com.zaxxer.hikari.util.DriverDataSource.getConnection(
                at com.zaxxer.hikari.pool.PoolBase.newConnection(
                at com.zaxxer.hikari.pool.PoolBase.newPoolEntry(
                at com.zaxxer.hikari.pool.HikariPool.createPoolEntry(
                at com.zaxxer.hikari.pool.HikariPool.checkFailFast(
                at com.zaxxer.hikari.pool.HikariPool.(
                at com.zaxxer.hikari.HikariDataSource.(
                at io.siddhi.core.table.record.AbstractQueryableRecordTable.connectAndLoadCache(
                at io.siddhi.core.table.Table.connectWithRetry(
                at io.siddhi.core.SiddhiAppRuntimeImpl.startWithoutSources(
                at io.siddhi.core.SiddhiAppRuntimeImpl.start(
                at io.siddhi.distribution.editor.core.internal.DebugRuntime.start(
                at io.siddhi.distribution.editor.core.internal.DebugProcessorService.start(
                at io.siddhi.distribution.editor.core.internal.EditorMicroservice.start(
                at io.siddhi.distribution.editor.core.internal.EditorMicroservice.startWithVariables(
                at sun.reflect.GeneratedMethodAccessor18.invoke(Unknown Source)
                at sun.reflect.DelegatingMethodAccessorImpl.invoke(
                at java.lang.reflect.Method.invoke(
                at org.wso2.msf4j.internal.router.HttpMethodInfo.invokeResource(
                at org.wso2.msf4j.internal.router.HttpMethodInfo.invoke(
                at org.wso2.msf4j.internal.MSF4JHttpConnectorListener.dispatchMethod(
                at org.wso2.msf4j.internal.MSF4JHttpConnectorListener.lambda$onMessage$58(
                at java.util.concurrent.ThreadPoolExecutor.runWorker(
                at java.util.concurrent.ThreadPoolExecutor$
            Caused by: com.mysql.cj.exceptions.InvalidConnectionAttributeException: The server time zone value 'unknown' is unrecognized or represents more than one time zone. You must configure either the server or JDBC driver (via the 'serverTimezone' configuration property) to use a more specifc time zone value if you want to utilize time zone support.
                at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
                at sun.reflect.NativeConstructorAccessorImpl.newInstance(
                at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(
                at java.lang.reflect.Constructor.newInstance(
                at com.mysql.cj.exceptions.ExceptionFactory.createException(
                at com.mysql.cj.exceptions.ExceptionFactory.createException(
                at com.mysql.cj.util.TimeUtil.getCanonicalTimezone(
                at com.mysql.cj.protocol.a.NativeProtocol.configureTimezone(
                at com.mysql.cj.protocol.a.NativeProtocol.initServerSession(
                at com.mysql.cj.jdbc.ConnectionImpl.initializePropsFromServer(
                at com.mysql.cj.jdbc.ConnectionImpl.connectOneTryOnly(
                at com.mysql.cj.jdbc.ConnectionImpl.createNewIO(
                ... 30 more
            [2020-05-06_16-31-42_749] ERROR {io.siddhi.core.table.Table} - Error on 'Assignment_02_01'. Failed to initialize pool: The server time zone value 'unknown' is unrecognized or represents more than one time zone. You must configure either the server or JDBC driver (via the 'serverTimezone' configuration property) to use a more specifc time zone value if you want to utilize time zone support. . Error while connecting to Table 'table1'. (Encoded) 
            com.zaxxer.hikari.pool.HikariPool$PoolInitializationException: Failed to initialize pool: The server time zone value 'unknown' is unrecognized or represents more than one time zone. You must configure either the server or JDBC driver (via the 'serverTimezone' configuration property) to use a more specifc time zone value if you want to utilize time zone support.
                at com.zaxxer.hikari.pool.HikariPool.throwPoolInitializationException(
                at com.zaxxer.hikari.pool.HikariPool.checkFailFast(
                at com.zaxxer.hikari.pool.HikariPool.(
                at com.zaxxer.hikari.HikariDataSource.(


            Answered 2020-May-06 at 11:22

            Error Cause was

            The server time zone value 'unknown' is unrecognized or represents more than one time zone. You must configure either the server or JDBC driver

            In jdbcURL string

            update it to



            Siddhi 5, compare value before
            Asked 2020-Feb-27 at 12:07

            I need that when I get a temperature higher than the maximum temperature stored or lower than the minimum stored, I send an alert with the new temperature to the alert stream.

            The problem that as I get a higher or lower temperature, first adds it to the maximum and / or minimum and then makes the check, so I never skip the alert.

            How can I do so that I first compare the new temperature that comes to me and jump on alert?



            Answered 2020-Feb-27 at 12:07

            You'll have to maintain a placeholder with the last max and min temperatures and use it when input temperature comes in.

            Please refer the sample code


            Community Discussions, Code Snippets contain sources that include Stack Exchange Network


            No vulnerabilities reported

            Install siddhi

            Download Siddhi Core Libraries;. Download Siddhi tooling and runtime distributions <a target="_blank" href="">here</a>.
            Versions 5.x and above with group id io.siddhi.* from <a target="_blank" href="">here</a>.
            Versions 4.x and lower with group id org.wso2.siddhi.* from <a target="_blank" href="">here</a>.


            You can reachout through Slack channel, Google mail group and etc. Please refer the community contribution [site]( for more information.
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