Source: https://seerepo.com/compare/apache/flink/vs/opensearch-project/OpenSearch Markdown source: https://seerepo.com/compare/apache/flink/vs/opensearch-project/OpenSearch.md Description: flink and OpenSearch share 12 technologies: apache-client, aws-crt-client, s3, Apache, org.apache.hadoop:hadoop-hdfs, software.amazon.awssdk:sts, commons-logging, io.opentelemetry:opentelemetry-exporter-logging, OpenTelemetry, org.apache.logging.log4j:log4j-api, org.apache.logging.log4j:log4j-core, and io.opentelemetry:opentelemetry-exporter-otlp. Both are written in Java. # flink vs OpenSearch flink and OpenSearch share 12 technologies: apache-client, aws-crt-client, s3, Apache, org.apache.hadoop:hadoop-hdfs, software.amazon.awssdk:sts, commons-logging, io.opentelemetry:opentelemetry-exporter-logging, OpenTelemetry, org.apache.logging.log4j:log4j-api, org.apache.logging.log4j:log4j-core, and io.opentelemetry:opentelemetry-exporter-otlp. Both are written in Java. - [apache/flink](https://seerepo.com/r/apache/flink): Apache Flink - [opensearch-project/OpenSearch](https://seerepo.com/r/opensearch-project/OpenSearch): 🔎 Open source distributed and RESTful search engine. ## What they share and what sets them apart - In common: apache-client, aws-crt-client, s3, Apache, org.apache.hadoop:hadoop-hdfs, software.amazon.awssdk:sts, commons-logging, io.opentelemetry:opentelemetry-exporter-logging, OpenTelemetry, org.apache.logging.log4j:log4j-api, org.apache.logging.log4j:log4j-core, io.opentelemetry:opentelemetry-exporter-otlp - Only in flink: 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-transfer-manager, zookeeper, org.apache.avro:avro, org.apache.orc:orc-core, org.apache.parquet:parquet-hadoop, pyarrow, com.aliyun.oss:aliyun-sdk-oss, InfluxDB, io.confluent:kafka-schema-registry-client, org.apache.parquet:parquet-avro, com.facebook.presto:presto-hive, OpenAI, grpc-bom, org.jetbrains.kotlin:kotlin-stdlib, apache-beam, Angular, aws-java-sdk-sts, org.apache.hadoop:hadoop-minikdc, hadoop-yarn-common, kubernetes-httpclient-okhttp, log4j-layout-template-json, metrics-core, metrics-graphite, org.apache.logging.log4j:log4j-slf4j2-impl, Prometheus, org.slf4j:slf4j-api, io.fabric8:kubernetes-client, io.opentelemetry:opentelemetry-api - Only in OpenSearch: JAX-RS, arrow-c-data, arrow-memory-netty-buffer-patch, avro, aws-json-protocol, kafka-clients, lucene-memory, org.apache.arrow:flight-core, datafusion, 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.ehcache:ehcache, foyer, grpc-services, JetBrains, servlet-api, Tokio, joou-java-6, com.google.auth:google-auth-library-oauth2-http, google-oauth-client, msal4j, nimbus-jose-jwt, oauth2-oidc-sdk, software.amazon.awssdk:auth, com.azure:azure-identity, compiler, jdom2, jsoup, mail, org.apache.james:apache-mime4j-dom, pdfbox-io, poi, poi-ooxml, poi-ooxml-lite, poi-scratchpad, tika-parsers, parquet, org.apache.tika:tika-core, org.apache.pdfbox:pdfbox, json-schema-validator, io.opentelemetry:opentelemetry-sdk-common, log4j-1.2-api, log4j-slf4j-impl, slf4j-api, log, software.amazon.awssdk:regions, io.opentelemetry:opentelemetry-sdk, software.amazon.awssdk:ec2, io.opentelemetry.semconv:opentelemetry-semconv ## Side by side | | flink | OpenSearch | |---|---|---| | Size | 2,869,317 lines written, 9,840 code files | 3,021,895 lines written, 8,159 code files | | Who writes it | 0.4% of its commits signed by AI. With Claude Code | 0% of its commits signed by AI. With Claude Code, Cursor, GitHub Copilot, and CodeRabbit | | Activity | Last push November 8, 2026, 38,159 commits, 26,458 stars | Last push November 9, 2026, 57,216 commits, 13,983 stars | | Tests | 5,728 test files. 61.8% of its code files have a test that imports them | 5,508 test files. 65.6% of its code files have a test that imports them | - Size: Lines written by people and agents, without generated ones; code files, without tests. - Who writes it: A commit counts as AI's when it carries its signature: a Co-Authored-By line, its author name or the merge of its branch. - Activity: From GitHub and its history, on the day SeeRepo read it. - Tests: The files that test the code, and the share of code files a test imports. ## Frequently asked questions ### Which is bigger, flink or OpenSearch? OpenSearch, with 3,021,895 lines written; flink has 2,869,317. The proof: [opensearch-project/OpenSearch's code at commit 2923a00](https://github.com/opensearch-project/OpenSearch/tree/2923a00aa3758b357462dc85dc85ebe3e834e37d) ### Which has more GitHub stars, flink or OpenSearch? flink, with 26,458 stars; OpenSearch has 13,983. The proof: [apache/flink on GitHub](https://github.com/apache/flink) ### Which has more tests, flink or OpenSearch? flink, with 5,728 test files; OpenSearch has 5,508. The proof: [apache/flink's code at commit 4fb928e](https://github.com/apache/flink/tree/4fb928ed93fcb24b58beba1b5e5d55b8168b1752) ### Which was updated more recently, flink or OpenSearch? OpenSearch: its last push was on November 9, 2026, and flink's on November 8, 2026. The proof: [opensearch-project/OpenSearch's commits on GitHub](https://github.com/opensearch-project/OpenSearch/commits) ### Which has more commits signed by AI, flink or OpenSearch? flink: an AI signed 0.4% of its commits, with Claude Code. The proof: [the commits each tool signed in apache/flink](https://seerepo.com/r/apache/flink/ai) ## Sources - apache/flink: Read on November 8, 2026, at commit 4fb928e (https://github.com/apache/flink/tree/4fb928ed93fcb24b58beba1b5e5d55b8168b1752) - opensearch-project/OpenSearch: Read on November 9, 2026, at commit 2923a00 (https://github.com/opensearch-project/OpenSearch/tree/2923a00aa3758b357462dc85dc85ebe3e834e37d) ## What is your repo built with? Any public repo, with no account: https://seerepo.com/r/owner/repo/built, with the owner and name it has on GitHub.