What is OpenSearch built with?

Q: Which repos have a stack like OpenSearch's?

The ones that share most of its stack: apache/flink, conductor-oss/conductor, and airbytehq/airbyte.

OpenSearch is a Java repo built with JAX-RS, grpc-services, JetBrains, servlet-api, and Tokio. It stores its data in datafusion, Apache, object_store, arrow, software.amazon.awssdk:sdk-core, and 7 more, reaches it with joou-java-6, signs people in with com.google.auth:google-auth-library-oauth2-http, google-oauth-client, msal4j, nimbus-jose-jwt, oauth2-oidc-sdk, and 3 more, makes its content with compiler, jdom2, jsoup, mail, org.apache.james:apache-mime4j-dom, and 9 more, validates its data with json-schema-validator, is tested with hamcrest-core, io.opentelemetry:opentelemetry-sdk-testing, reactor-test, org.hamcrest:hamcrest, junit:junit, and 1 more, deploys with commons-logging, io.opentelemetry:opentelemetry-sdk-common, log4j-1.2-api, log4j-slf4j-impl, org.apache.logging.log4j:log4j-api, and 10 more, and uses apache-client, arrow-c-data, arrow-memory-netty-buffer-patch, avro, aws-crt-client, and 6 more. It has 3,021,895 written lines, with 5,508 test files.

Read on November 9, 2026, at commit 2923a00. Read it as markdown

Backend

The base 1

JAX-RS

Data 23

datafusion104 files
Apache80 files
arrow25 files
datafusion-datasource7 files
foyer1 file
org.apache.arrow:flight-core
object_store30 files
software.amazon.awssdk:sdk-core15 files
org.apache.hadoop:hadoop-client-api9 files
org.apache.calcite.avatica:avatica-core8 files
com.azure:azure-storage-blob4 files
software.amazon.awssdk:kms3 files

11 more

org.apache.hadoop:hadoop-hdfs2 files
org.ehcache:ehcache2 files
apache-client
arrow-c-data
arrow-memory-netty-buffer-patch
avro
aws-crt-client
aws-json-protocol
kafka-clients
lucene-memory
s3

Data access 1

joou-java-6

Sign-in 8

com.google.auth:google-auth-library-oauth2-http
software.amazon.awssdk:auth14 files
software.amazon.awssdk:sts2 files
com.azure:azure-identity1 file
google-oauth-client
msal4j
nimbus-jose-jwt
oauth2-oidc-sdk

Support

The base 4

Tokio31 files
JetBrains
grpc-services
servlet-api

Content 14

parquet18 files
org.apache.james:apache-mime4j-dom
org.apache.tika:tika-core2 files
org.apache.pdfbox:pdfbox1 file
compiler
jdom2
jsoup
mail
pdfbox-io
poi
poi-ooxml
poi-ooxml-lite

2 more

poi-scratchpad
tika-parsers

Validation 1

json-schema-validator

Testing 6

io.opentelemetry:opentelemetry-sdk-testing
org.hamcrest:hamcrest2,099 files
junit:junit930 files
io.netty:netty-pkitesting6 files
hamcrest-core
reactor-test

Deploy 15

OpenTelemetry14 files
io.opentelemetry:opentelemetry-sdk5 files
io.opentelemetry:opentelemetry-exporter-logging1 file
io.opentelemetry:opentelemetry-exporter-otlp1 file
io.opentelemetry.semconv:opentelemetry-semconv1 file
io.opentelemetry:opentelemetry-sdk-common
org.apache.logging.log4j:log4j-api
log12 files
org.apache.logging.log4j:log4j-core11 files
software.amazon.awssdk:regions6 files
software.amazon.awssdk:ec23 files
commons-logging

3 more

Tools 19

org.apache.ant:ant4 files
OpenJDK2 files
org.apache.maven:maven-model2 files
Shadow
org.antlr:antlr4-runtime7 files
quote1 file
syn1 file
asm
asm-analysis
asm-commons
asm-tree
asm-util

7 more

checker-qual
commons-cli
commons-compiler
jsr305
proc-macro2
spotbugs-annotations
value-annotations

Other 162

org.apache.lucene:lucene-queries30 files
once_cell9 files
arrow-array8 files
io.opentelemetry:opentelemetry-context6 files
tokio-util6 files
Netflix4 files
datafusion-common3 files
arrow-schema2 files
Google2 files
tikv-jemallocator2 files
arrow-ipc1 file
org.apache.arrow:arrow-compression1 file

150 more

org.apache.thrift:libthrift1 file
tikv-jemalloc-ctl1 file
tikv-jemalloc-sys1 file
tokio-stream1 file
com.google.code.gson:gson
org.apache.httpcomponents.client5:httpclient5
org.apache.lucene:lucene-core923 files
org.apache.calcite:calcite-core262 files
io.netty:netty-handler25 files
tools.jackson.core:jackson-core24 files
serde_json20 files
io.grpc:grpc-api18 files
org.reactivestreams:reactive-streams18 files
io.netty:netty-buffer17 files
joda-time:joda-time15 files
org.locationtech.jts:jts-core15 files
futures14 files
chrono13 files
dashmap10 files
tempfile10 files
com.fasterxml.jackson.core:jackson-databind9 files
com.ibm.icu:icu4j9 files
prost9 files
regex9 files
bytes8 files
io.grpc:grpc-stub7 files
parking_lot7 files
org.roaringbitmap:RoaringBitmap6 files
async-trait5 files
javax.inject:javax.inject5 files
net.bytebuddy:byte-buddy5 files
serde5 files
com.jcraft:jzlib4 files
url4 files
io.grpc:grpc-netty3 files
roaring3 files
com.tdunning:t-digest2 files
crc32fast2 files
libc2 files
org.apache.httpcomponents:httpclient2 files
org.apache.lucene:lucene-analysis-common2 files
rayon2 files
software.amazon.awssdk:aws-core2 files
thiserror2 files
tools.jackson.dataformat:jackson-dataformat-cbor2 files
tools.jackson.dataformat:jackson-dataformat-smile2 files
base641 file
chrono-tz1 file
com.github.luben:zstd-jni1 file
fancy-regex1 file
io.grpc:grpc-protobuf1 file
io.netty:netty-resolver1 file
lazy_static1 file
num_cpus1 file
org.apache.commons:commons-collections41 file
org.apache.commons:commons-compress1 file
org.apache.lucene:lucene-queryparser1 file
org.jboss.resteasy:resteasy-jackson2-provider1 file
org.snakeyaml:snakeyaml-engine1 file
sha11 file
software.amazon.awssdk.crt:aws-crt1 file
arrow-memory-netty
arrow-memory-unsafe
bc-fips
bcpkix-fips
bctls-fips
bcutil-fips
checksums
commons-beanutils
commons-codec
commons-collections
commons-io
commons-lang3
commons-math3
failureaccess
google-api-client
google-http-client-gson
google-http-client-jackson2
grpc-core
grpc-netty-shaded
grpc-protobuf-lite
grpc-util
HdrHistogram
httpcore
httpcore5
ipaddress
jackson-annotations
jackson-core
jackson-databind
jackson-dataformat-cbor
jackson-dataformat-smile
jackson-dataformat-xml
jackson-dataformat-yaml
jackson-datatype-jdk8
jackson-datatype-jsr310
jackson-jakarta-rs-json-provider
jackson-module-jaxb-annotations
jakarta.annotation-api
janino
jaxb-api
jaxb-impl
jcodings
jersey-client
jettison
jna
jna-platform
jopt-simple
json-path
json-smart
juniversalchardet
language-detector
libphonenumber
lucene-backward-codecs
lucene-highlighter
lz4-java
morfologik-fsa
morfologik-stemming
netty-all
netty-codec
netty-codec-base
netty-codec-classes-quic
netty-codec-compression
netty-codec-dns
netty-codec-http
netty-codec-http2
netty-codec-http3
netty-codec-native-quic
netty-codec-socks
netty-common
netty-handler-proxy
netty-nio-client
netty-resolver-dns
netty-tcnative-classes
netty-transport
netty-transport-classes-epoll
netty-transport-native-unix-common
okhttp
okio-jvm
perfmark-api
picocli
plexus-utils
protocol-core
reactor-core
reactor-netty-core
reactor-netty-http
snakeyaml
snappy-java
stax2-api
woodstox-core
xz

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Frequently asked questions

What language is OpenSearch written in?

OpenSearch is written in Java, with 3,021,895 written lines.

What framework does OpenSearch use?

OpenSearch is built with JAX-RS, grpc-services, JetBrains, servlet-api, and Tokio.

What database does OpenSearch use?

OpenSearch stores its data in datafusion, Apache, object_store, arrow, software.amazon.awssdk:sdk-core, org.apache.hadoop:hadoop-client-api, org.apache.calcite.avatica:avatica-core, datafusion-datasource, com.azure:azure-storage-blob, software.amazon.awssdk:kms, org.apache.hadoop:hadoop-hdfs, and org.ehcache:ehcache and reaches it with joou-java-6.

What does OpenSearch sign people in with?

OpenSearch signs people in with com.google.auth:google-auth-library-oauth2-http, google-oauth-client, msal4j, nimbus-jose-jwt, oauth2-oidc-sdk, software.amazon.awssdk:auth, software.amazon.awssdk:sts, and com.azure:azure-identity.

What services does OpenSearch use?

OpenSearch uses apache-client, arrow-c-data, arrow-memory-netty-buffer-patch, avro, aws-crt-client, aws-json-protocol, kafka-clients, lucene-memory, org.apache.arrow:flight-core, s3, and foyer.

Does OpenSearch have tests?

Yes. OpenSearch has 5,508 test files and is tested with hamcrest-core, io.opentelemetry:opentelemetry-sdk-testing, reactor-test, org.hamcrest:hamcrest, junit:junit, and io.netty:netty-pkitesting.

Which repos have a stack like OpenSearch's?

The ones that share most of its stack:apache/flink conductor-oss/conductor airbytehq/airbyte