Apache Apex malhar

Clone this repo:
  1. 58201fb Update README.md closes #337 by Thomas Weise · 8 months ago master
  2. eb62451 Removed deployment documentation as it is included in the release documentation by Pramod Immaneni · 11 months ago
  3. 139d89f japicmp 0.9.0 by Thomas Weise · 8 months ago
  4. f5f1943 APEXMALHAR-2267 #resolve renamed spillable data structures to remove the word "Byte" by David Yan · 8 months ago
  5. c19c80d APEXMALHAR-2130 Spillable implementation for WindowedOperator by David Yan · 10 months ago

Apache Apex Malhar

Malhar repository contains open source operator and codec library that can be used with the Apache Apex platform to build Realtime streaming applications. In addition to the library there are benchmark, contrib, demos, webdemos and samples folders available. Demos contain demo applications built using the library operators. Webdemos contain webpages for the demos. Benchmark contains performance testing applications. Contrib contains additional operators that interface with third party softwares. Samples contain some sample code that shows how to use the library operators.


This project welcomes new contributors. If you would like to help by adding new features, enhancing existing features, or fixing bugs, check out the contributing guidelines and guidelines for contributing to the operator library.

You acknowledge that your submissions to this repository are made pursuant the terms of the Apache License, Version 2.0 (http://www.apache.org/licenses/LICENSE-2.0.html) and constitute “Contributions,” as defined therein, and you represent and warrant that you have the right and authority to do so.

You can submit new issues and track the progress of existing issues at https://issues.apache.org/jira/browse/APEXMALHAR


Please visit the documentation section.

Discussion group

Please visit http://apex.apache.org and subscribe to the mailing lists.

Building the project

The project uses Maven for the build. Run

mvn install -DskipTests

The code depends on the Apex API, which is available in the Maven Central Repository. Individual modules such as library can be built independently by changing directory to the module and running maven there.

Multiple demo applications are provided to showcase the Apex platform and application development process.


Licensed under the Apache License, Version 2.0 (the “License”); you may not use this file except in compliance with the License. You may obtain a copy of the License at


Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an “AS IS” BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.