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What is flink built with?

flink is a Java repo built with grpc-bom, org.jetbrains.kotlin:kotlin-stdlib, apache-beam, and Angular. It stores its data in org.apache.avro:avro, Apache, org.apache.orc:orc-core, org.apache.parquet:parquet-hadoop, pyarrow, and 5 more, signs people in with aws-java-sdk-sts, software.amazon.awssdk:sts, and org.apache.hadoop:hadoop-minikdc, uses AI through OpenAI, is tested with archunit-junit5, hadoop-minicluster, hamcrest-all, junit-jupiter-api, junit-jupiter-engine, and 20 more, deploys with commons-logging, hadoop-yarn-common, io.opentelemetry:opentelemetry-exporter-logging, kubernetes-httpclient-okhttp, log4j-layout-template-json, and 11 more, and uses apache-client, aws-crt-client, aws-java-sdk-dynamodb, aws-java-sdk-s3, fastavro, and 12 more. It has 2,869,317 written lines, with 5,728 test files.

Read on November 8, 2026, at commit 4fb928e. Read it as markdown

Frontend

The base 1

Backend

Data 27

  • Apache40 files
  • pyarrow11 files
  • InfluxDB3 files
  • Hive
  • org.apache.hadoop:hadoop-hdfs-client
  • org.apache.avro:avro42 files
  • org.apache.orc:orc-core27 files
  • org.apache.parquet:parquet-hadoop11 files
  • com.aliyun.oss:aliyun-sdk-oss5 files
  • org.apache.hadoop:hadoop-hdfs3 files
  • io.confluent:kafka-schema-registry-client2 files
  • org.apache.parquet:parquet-avro2 files
15 more
  • com.facebook.presto:presto-hive1 file
  • apache-client
  • aws-crt-client
  • aws-java-sdk-dynamodb
  • aws-java-sdk-s3
  • fastavro
  • hadoop-aliyun
  • hadoop-apache2
  • hadoop-aws
  • hadoop-azure
  • hadoop-common
  • hadoop-mapreduce-client-core
  • s3
  • s3-transfer-manager
  • zookeeper

Sign-in 3

  • software.amazon.awssdk:sts4 files
  • org.apache.hadoop:hadoop-minikdc1 file
  • aws-java-sdk-sts

Services 1

Support

The base 3

  • apache-beam14 files
  • org.jetbrains.kotlin:kotlin-stdlib
  • grpc-bom

Testing 25

  • org.assertj:assertj-core3,113 files
  • org.junit.jupiter:junit-jupiter288 files
  • org.mockito:mockito-core139 files
  • org.junit:junit-bom125 files
  • org.hamcrest:hamcrest-core63 files
  • com.tngtech.archunit:archunit40 files
  • org.testcontainers:testcontainers16 files
  • org.apache.curator:curator-test8 files
  • com.github.tomakehurst:wiremock-jre81 file
  • io.airlift.tpch:tpch1 file
  • junit:junit1 file
  • net.javacrumbs.json-unit:json-unit-assertj1 file
13 more
  • archunit-junit5
  • hadoop-minicluster
  • hamcrest-all
  • junit-jupiter-api
  • junit-jupiter-engine
  • junit-vintage-engine
  • kubernetes-server-mock
  • mockito-junit-jupiter
  • mockito-subclass
  • mockwebserver
  • scalatest_${scala.binary.version}
  • testcontainers-bom
  • testcontainers-junit-jupiter

Deploy 16

4 more
  • kubernetes-httpclient-okhttp
  • log4j-layout-template-json
  • metrics-core
  • metrics-graphite

Tools 10

  • org.immutables:value79 files
  • org.checkerframework:checker-qual57 files
  • org.antlr:antlr4-runtime9 files
  • org.projectlombok:lombok2 files
  • typing-extensions2 files
  • org.codehaus.janino:commons-compiler1 file
  • async-profiler
  • checkstyle
  • commons-cli
  • jsr305

Other 67

  • Esoteric Software22 files
  • pandas8 files
  • org.apache.commons:commons-text6 files
  • ruamel.yaml2 files
  • io.opentelemetry:opentelemetry-context1 file
  • NumPy1 file
  • python-dateutil1 file
  • Google
  • JetBrains
  • Scala
  • org.apache.calcite:calcite-core368 files
  • org.apache.hadoop:hadoop-yarn-api137 files
55 more
  • org.apache.commons:commons-lang361 files
  • py4j29 files
  • com.amazonaws:aws-java-sdk-core12 files
  • org.apache.hadoop:hadoop-yarn-client12 files
  • org.jline:jline-terminal11 files
  • org.apache.commons:commons-math310 files
  • org.apache.commons:commons-compress7 files
  • com.typesafe:config6 files
  • org.objenesis:objenesis5 files
  • cloudpickle4 files
  • io.airlift:aircompressor4 files
  • org.jline:jline-reader4 files
  • pytz4 files
  • org.reflections:reflections3 files
  • com.fasterxml.jackson:jackson-bom2 files
  • org.codehaus.janino:janino2 files
  • com.fasterxml.jackson.core:jackson-core1 file
  • com.ibm.icu:icu4j1 file
  • com.knuddels:jtokkit1 file
  • org.roaringbitmap:RoaringBitmap1 file
  • org.snakeyaml:snakeyaml-engine1 file
  • org.xerial.snappy:snappy-java1 file
  • arrow-memory-netty
  • aws-crt
  • byte-buddy
  • byte-buddy-agent
  • commons-codec
  • commons-collections
  • commons-configuration
  • commons-io
  • conscrypt-openjdk-uber
  • fastutil
  • httpclient
  • httpcore
  • httplib2
  • jackson-annotations
  • jackson-databind
  • jackson-datatype-jdk8
  • jackson-mapper-asl
  • javassist
  • jna
  • joda-time
  • json-path
  • logging-interceptor
  • lz4-java
  • netty-bom
  • netty-handler
  • netty-nio-client
  • netty-transport
  • okhttp
  • oshi-core
  • protobuf
  • quartz
  • requests
  • zstd-jni

Other repos with a similar stack

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Frequently asked questions

What language is flink written in?
flink is written in Java, with 2,869,317 written lines.
What framework does flink use?
flink is built with grpc-bom, org.jetbrains.kotlin:kotlin-stdlib, apache-beam, and Angular.
What database does flink use?
flink stores its data in org.apache.avro:avro, Apache, org.apache.orc:orc-core, org.apache.parquet:parquet-hadoop, pyarrow, com.aliyun.oss:aliyun-sdk-oss, InfluxDB, org.apache.hadoop:hadoop-hdfs, io.confluent:kafka-schema-registry-client, and org.apache.parquet:parquet-avro.
What does flink sign people in with?
flink signs people in with aws-java-sdk-sts, software.amazon.awssdk:sts, and org.apache.hadoop:hadoop-minikdc.
Does flink use AI?
Yes. flink uses AI through OpenAI.

The proof: flink-models/flink-model-openai/src/main/java/org/apache/flink/model/openai/OpenAIChatModelFunction.java, line 29

What services does flink use?
flink uses apache-client, aws-crt-client, aws-java-sdk-dynamodb, aws-java-sdk-s3, fastavro, hadoop-aliyun, hadoop-apache2, hadoop-aws, hadoop-azure, hadoop-common, hadoop-mapreduce-client-core, Hive, org.apache.hadoop:hadoop-hdfs-client, s3, s3-transfer-manager, zookeeper, and com.facebook.presto:presto-hive.
Does flink have tests?
Yes. flink has 5,728 test files and is tested with archunit-junit5, hadoop-minicluster, hamcrest-all, junit-jupiter-api, junit-jupiter-engine, junit-vintage-engine, kubernetes-server-mock, mockito-junit-jupiter, mockito-subclass, mockwebserver, scalatest_${scala.binary.version}, testcontainers-bom, testcontainers-junit-jupiter, org.assertj:assertj-core, org.junit.jupiter:junit-jupiter, org.mockito:mockito-core, org.junit:junit-bom, org.hamcrest:hamcrest-core, com.tngtech.archunit:archunit, org.testcontainers:testcontainers, org.apache.curator:curator-test, com.github.tomakehurst:wiremock-jre8, io.airlift.tpch:tpch, junit:junit, and net.javacrumbs.json-unit:json-unit-assertj.
Which repos have a stack like flink's?
The ones that share most of its stack:apache/airflowmudler/LocalAIseaweedfs/seaweedfs

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