• Stars
    star
    22,197
  • Rank 1,033 (Top 0.03 %)
  • Language
    Java
  • License
    Apache License 2.0
  • Created almost 10 years ago
  • Updated 7 months ago

Reviews

There are no reviews yet. Be the first to send feedback to the community and the maintainers!

Repository Details

Apache Flink

Apache Flink

Apache Flink is an open source stream processing framework with powerful stream- and batch-processing capabilities.

Learn more about Flink at https://flink.apache.org/

Features

  • A streaming-first runtime that supports both batch processing and data streaming programs

  • Elegant and fluent APIs in Java and Scala

  • A runtime that supports very high throughput and low event latency at the same time

  • Support for event time and out-of-order processing in the DataStream API, based on the Dataflow Model

  • Flexible windowing (time, count, sessions, custom triggers) across different time semantics (event time, processing time)

  • Fault-tolerance with exactly-once processing guarantees

  • Natural back-pressure in streaming programs

  • Libraries for Graph processing (batch), Machine Learning (batch), and Complex Event Processing (streaming)

  • Built-in support for iterative programs (BSP) in the DataSet (batch) API

  • Custom memory management for efficient and robust switching between in-memory and out-of-core data processing algorithms

  • Compatibility layers for Apache Hadoop MapReduce

  • Integration with YARN, HDFS, HBase, and other components of the Apache Hadoop ecosystem

Streaming Example

case class WordWithCount(word: String, count: Long)

val text = env.socketTextStream(host, port, '\n')

val windowCounts = text.flatMap { w => w.split("\\s") }
  .map { w => WordWithCount(w, 1) }
  .keyBy("word")
  .window(TumblingProcessingTimeWindow.of(Time.seconds(5)))
  .sum("count")

windowCounts.print()

Batch Example

case class WordWithCount(word: String, count: Long)

val text = env.readTextFile(path)

val counts = text.flatMap { w => w.split("\\s") }
  .map { w => WordWithCount(w, 1) }
  .groupBy("word")
  .sum("count")

counts.writeAsCsv(outputPath)

Building Apache Flink from Source

Prerequisites for building Flink:

  • Unix-like environment (we use Linux, Mac OS X, Cygwin, WSL)
  • Git
  • Maven (we require version 3.8.6)
  • Java 8 or 11 (Java 9 or 10 may work)
git clone https://github.com/apache/flink.git
cd flink
./mvnw clean package -DskipTests # this will take up to 10 minutes

Flink is now installed in build-target.

Developing Flink

The Flink committers use IntelliJ IDEA to develop the Flink codebase. We recommend IntelliJ IDEA for developing projects that involve Scala code.

Minimal requirements for an IDE are:

  • Support for Java and Scala (also mixed projects)
  • Support for Maven with Java and Scala

IntelliJ IDEA

The IntelliJ IDE supports Maven out of the box and offers a plugin for Scala development.

Check out our Setting up IntelliJ guide for details.

Eclipse Scala IDE

NOTE: From our experience, this setup does not work with Flink due to deficiencies of the old Eclipse version bundled with Scala IDE 3.0.3 or due to version incompatibilities with the bundled Scala version in Scala IDE 4.4.1.

We recommend to use IntelliJ instead (see above)

Support

Donโ€™t hesitate to ask!

Contact the developers and community on the mailing lists if you need any help.

Open an issue if you find a bug in Flink.

Documentation

The documentation of Apache Flink is located on the website: https://flink.apache.org or in the docs/ directory of the source code.

Fork and Contribute

This is an active open-source project. We are always open to people who want to use the system or contribute to it. Contact us if you are looking for implementation tasks that fit your skills. This article describes how to contribute to Apache Flink.

Externalized Connectors

Most Flink connectors have been externalized to individual repos under the Apache Software Foundation:

About

Apache Flink is an open source project of The Apache Software Foundation (ASF). The Apache Flink project originated from the Stratosphere research project.

More Repositories

1

echarts

Apache ECharts is a powerful, interactive charting and data visualization library for browser
TypeScript
56,321
star
2

superset

Apache Superset is a Data Visualization and Data Exploration Platform
TypeScript
55,051
star
3

dubbo

The java implementation of Apache Dubbo. An RPC and microservice framework.
Java
39,899
star
4

spark

Apache Spark - A unified analytics engine for large-scale data processing
Scala
36,719
star
5

airflow

Apache Airflow - A platform to programmatically author, schedule, and monitor workflows
Python
34,692
star
6

kafka

Mirror of Apache Kafka
Java
27,504
star
7

incubator-seata

๐Ÿ”ฅ Seata is an easy-to-use, high-performance, open source distributed transaction solution.
Java
24,602
star
8

skywalking

APM, Application Performance Monitoring System
Java
22,610
star
9

mxnet

Lightweight, Portable, Flexible Distributed/Mobile Deep Learning with Dynamic, Mutation-aware Dataflow Dep Scheduler; for Python, R, Julia, Scala, Go, Javascript and more
C++
20,572
star
10

shardingsphere

Distributed SQL transaction & query engine for data sharding, scaling, encryption, and more - on any database.
Java
19,287
star
11

rocketmq

Apache RocketMQ is a cloud native messaging and streaming platform, making it simple to build event-driven applications.
Java
18,578
star
12

brpc

brpc is an Industrial-grade RPC framework using C++ Language, which is often used in high performance system such as Search, Storage, Machine learning, Advertisement, Recommendation etc. "brpc" means "better RPC".
C++
14,261
star
13

incubator-weex

Apache Weex (Incubating)
C++
13,884
star
14

hadoop

Apache Hadoop
Java
13,855
star
15

arrow

Apache Arrow is a multi-language toolbox for accelerated data interchange and in-memory processing
C++
13,564
star
16

pulsar

Apache Pulsar - distributed pub-sub messaging system
Java
13,062
star
17

druid

Apache Druid: a high performance real-time analytics database.
Java
12,843
star
18

predictionio

PredictionIO, a machine learning server for developers and ML engineers.
Scala
12,556
star
19

zookeeper

Apache ZooKeeper
Java
11,532
star
20

incubator-answer

A Q&A platform software for teams at any scales. Whether it's a community forum, help center, or knowledge management platform, you can always count on Apache Answer.
Go
11,487
star
21

doris

Apache Doris is an easy-to-use, high performance and unified analytics database.
Java
11,362
star
22

apisix

The Cloud-Native API Gateway
Lua
11,031
star
23

thrift

Apache Thrift
C++
9,900
star
24

dolphinscheduler

Apache DolphinScheduler is the modern data workflow orchestration platform with powerful user interface, dedicated to solving complex task dependencies in the data pipeline and providing various types of jobs available `out of the box`
Java
9,619
star
25

cassandra

Mirror of Apache Cassandra
Java
8,187
star
26

shardingsphere-elasticjob

Distributed scheduled job
Java
7,965
star
27

tvm

Open deep learning compiler stack for cpu, gpu and specialized accelerators
Python
7,828
star
28

shenyu

Apache ShenYu is a Java native API Gateway for service proxy, protocol conversion and API governance.
Java
7,541
star
29

beam

Apache Beam is a unified programming model for Batch and Streaming data processing.
Java
7,516
star
30

jmeter

Apache JMeter open-source load testing tool for analyzing and measuring the performance of a variety of services
Java
7,335
star
31

tomcat

Apache Tomcat
Java
6,926
star
32

storm

Apache Storm
Java
6,480
star
33

zeppelin

Web-based notebook that enables data-driven, interactive data analytics and collaborative documents with SQL, Scala and more.
Java
6,162
star
34

openwhisk

Apache OpenWhisk is an open source serverless cloud platform
Scala
6,130
star
35

couchdb

Seamless multi-master syncing database with an intuitive HTTP/JSON API, designed for reliability
Erlang
5,810
star
36

incubator-kie-drools

Drools is a rule engine, DMN engine and complex event processing (CEP) engine for Java.
Java
5,542
star
37

iceberg

Apache Iceberg
Java
5,504
star
38

dubbo-spring-boot-project

Spring Boot Project for Apache Dubbo
Java
5,355
star
39

mesos

Apache Mesos
Java
5,111
star
40

hive

Apache Hive
Java
5,053
star
41

camel

Apache Camel is an open source integration framework that empowers you to quickly and easily integrate various systems consuming or producing data.
Java
5,042
star
42

groovy

Apache Groovy: A powerful multi-faceted programming language for the JVM platform
Java
4,977
star
43

hbase

Apache HBase
Java
4,971
star
44

incubator-weex-ui

๐Ÿ„ A rich interaction, lightweight, high performance UI library based on Weex.
Vue
4,788
star
45

pinot

Apache Pinot - A realtime distributed OLAP datastore
Java
4,766
star
46

ignite

Apache Ignite
Java
4,548
star
47

rocketmq-externals

Mirror of Apache RocketMQ (Incubating)
Java
4,474
star
48

seatunnel

SeaTunnel is a distributed, high-performance data integration platform for the synchronization and transformation of massive data (offline & real-time).
Java
4,459
star
49

incubator-pagespeed-ngx

Automatic PageSpeed optimization module for Nginx
C++
4,381
star
50

lucene-solr

Apache Lucene and Solr open-source search software
4,349
star
51

dubbo-go

Go Implementation For Apache Dubbo
Go
4,315
star
52

shiro

Apache Shiro
Java
4,164
star
53

calcite

Apache Calcite
Java
4,028
star
54

nifi

Apache NiFi
Java
4,006
star
55

maven

Apache Maven core
Java
3,836
star
56

hudi

Upserts, Deletes And Incremental Processing on Big Data.
Java
3,804
star
57

dubbo-admin

The ops and reference implementation for Apache Dubbo
Java
3,707
star
58

incubator-heron

Apache Heron (Incubating) is a realtime, distributed, fault-tolerant stream processing engine from Twitter
Java
3,646
star
59

cordova-android

Apache Cordova Android
JavaScript
3,539
star
60

kylin

Apache Kylin
Java
3,526
star
61

httpd

Mirror of Apache HTTP Server. Issues: http://issues.apache.org
C
3,376
star
62

linkis

Apache Linkis builds a computation middleware layer to facilitate connection, governance and orchestration between the upper applications and the underlying data engines.
Java
3,224
star
63

incubator-kie-optaplanner

AI constraint solver in Java to optimize the vehicle routing problem, employee rostering, task assignment, maintenance scheduling, conference scheduling and other planning problems.
Java
3,152
star
64

logging-log4j2

Apache Log4j 2 is a versatile, feature-rich, efficient logging API and backend for Java.
Java
3,151
star
65

iotdb

Apache IoTDB
Java
3,000
star
66

arrow-datafusion

Apache Arrow DataFusion SQL Query Engine
Rust
2,998
star
67

curator

Apache Curator
Java
2,997
star
68

singa

a distributed deep learning platform
C++
2,968
star
69

incubator-streampark

StreamPark, Make stream processing easier! easy-to-use streaming application development framework and operation platform
Scala
2,820
star
70

nutch

Apache Nutch is an extensible and scalable web crawler
Java
2,653
star
71

incubator-fury

A blazingly fast multi-language serialization framework powered by JIT and zero-copy.
Java
2,649
star
72

guacamole-server

Mirror of Apache Guacamole Server
C
2,601
star
73

avro

Apache Avro is a data serialization system.
Java
2,571
star
74

netbeans

Apache NetBeans
Java
2,553
star
75

commons-lang

Apache Commons Lang
Java
2,539
star
76

flume

Mirror of Apache Flume
Java
2,458
star
77

incubator-devlake

Apache DevLake is an open-source dev data platform to ingest, analyze, and visualize the fragmented data from DevOps tools, extracting insights for engineering excellence, developer experience, and community growth.
Go
2,440
star
78

geode

Apache Geode
Java
2,244
star
79

incubator-seata-samples

seata-samples
Java
2,196
star
80

maven-mvnd

Apache Maven Daemon
Java
2,191
star
81

activemq

Mirror of Apache ActiveMQ
Java
2,184
star
82

gobblin

A distributed data integration framework that simplifies common aspects of big data integration such as data ingestion, replication, organization and lifecycle management for both streaming and batch data ecosystems.
Java
2,183
star
83

incubator-hugegraph

A graph database that supports more than 100+ billion data, high performance and scalability (Include OLTP Engine & REST-API & Backends)
Java
2,156
star
84

parquet-mr

Apache Parquet
Java
2,153
star
85

incubator-kvrocks

Kvrocks is a distributed key value NoSQL database that uses RocksDB as storage engine and is compatible with Redis protocol.
C++
2,147
star
86

pdfbox

Mirror of Apache PDFBox
Java
2,131
star
87

cordova-ios

Apache Cordova iOS
JavaScript
2,130
star
88

mahout

Mirror of Apache Mahout
Java
2,095
star
89

lucenenet

Apache Lucene.NET
C#
2,031
star
90

ambari

Apache Ambari simplifies provisioning, managing, and monitoring of Apache Hadoop clusters.
Java
1,990
star
91

libcloud

Apache Libcloud is a Python library which hides differences between different cloud provider APIs and allows you to manage different cloud resources through a unified and easy to use API.
Python
1,956
star
92

incubator-pegasus

Apache Pegasus - A horizontally scalable, strongly consistent and high-performance key-value store
C++
1,946
star
93

tika

The Apache Tika toolkit detects and extracts metadata and text from over a thousand different file types (such as PPT, XLS, and PDF).
Java
1,860
star
94

drill

Apache Drill is a distributed MPP query layer for self describing data
Java
1,841
star
95

dubbo-samples

samples for Apache Dubbo
Java
1,839
star
96

servicecomb-java-chassis

ServiceComb Java Chassis is a Software Development Kit (SDK) for rapid development of microservices in Java, providing service registration, service discovery, dynamic routing, and service management features
Java
1,829
star
97

tinkerpop

Apache TinkerPop - a graph computing framework
Java
1,825
star
98

bookkeeper

Apache BookKeeper - a scalable, fault tolerant and low latency storage service optimized for append-only workloads
Java
1,785
star
99

rocketmq-spring

Apache RocketMQ Spring Integration
Java
1,775
star
100

kudu

Mirror of Apache Kudu
C++
1,743
star