Source: https://seerepo.com/compare/apache/pulsar/vs/open-metadata/OpenMetadata
Markdown source: https://seerepo.com/compare/apache/pulsar/vs/open-metadata/OpenMetadata.md
Description: pulsar and OpenMetadata share 20 technologies: JAX-RS, javax.ws.rs-api, jersey-container-servlet, jersey-media-json-jackson, jetty-bom, jetty-ee10-servlets, jakarta.servlet:jakarta.servlet-api, org.glassfish.jersey.media:jersey-media-multipart, org.eclipse.jetty:jetty-util, org.eclipse.jetty:jetty-server, org.eclipse.jetty.ee10:jetty-ee10-servlet, javax.servlet:javax.servlet-api, java-jwt, commonmark-ext-gfm-tables, org.commonmark:commonmark, metrics-core, OpenTelemetry, org.slf4j:slf4j-api, org.apache.logging.log4j:log4j-api, and Prometheus. Both are written in Java.

# pulsar vs OpenMetadata

pulsar and OpenMetadata share 20 technologies: JAX-RS, javax.ws.rs-api, jersey-container-servlet, jersey-media-json-jackson, jetty-bom, jetty-ee10-servlets, jakarta.servlet:jakarta.servlet-api, org.glassfish.jersey.media:jersey-media-multipart, org.eclipse.jetty:jetty-util, org.eclipse.jetty:jetty-server, org.eclipse.jetty.ee10:jetty-ee10-servlet, javax.servlet:javax.servlet-api, java-jwt, commonmark-ext-gfm-tables, org.commonmark:commonmark, metrics-core, OpenTelemetry, org.slf4j:slf4j-api, org.apache.logging.log4j:log4j-api, and Prometheus. Both are written in Java.

- [apache/pulsar](https://seerepo.com/r/apache/pulsar): Apache Pulsar - distributed pub-sub messaging system
- [open-metadata/OpenMetadata](https://seerepo.com/r/open-metadata/OpenMetadata): The Open Context Layer for Data and AI ,  OpenMetadata is the open platform for building trusted data context and business semantics for humans, AI assistants, and agents.

## What they share and what sets them apart

- In common: JAX-RS, javax.ws.rs-api, jersey-container-servlet, jersey-media-json-jackson, jetty-bom, jetty-ee10-servlets, jakarta.servlet:jakarta.servlet-api, org.glassfish.jersey.media:jersey-media-multipart, org.eclipse.jetty:jetty-util, org.eclipse.jetty:jetty-server, org.eclipse.jetty.ee10:jetty-ee10-servlet, javax.servlet:javax.servlet-api, java-jwt, commonmark-ext-gfm-tables, org.commonmark:commonmark, metrics-core, OpenTelemetry, org.slf4j:slf4j-api, org.apache.logging.log4j:log4j-api, Prometheus
- Only in pulsar: aws-java-sdk-bom, curator-recipes, hadoop-common, org.apache.hadoop:hadoop-hdfs-client, zookeeper, org.apache.avro:avro, com.github.ben-manes.caffeine:caffeine, github.com/apache/pulsar-client-go, RocksDB, grpc-bom, jersey-container-servlet-core, jersey-hk2, vertx-web, org.eclipse.jetty.ee10.websocket:jetty-ee10-websocket-jetty-server, org.eclipse.jetty.websocket:jetty-websocket-jetty-api, org.glassfish.jersey.core:jersey-server, org.eclipse.jetty.ee8:jetty-ee8-servlet, com.google.inject:guice, org.apache.felix:org.apache.felix.http.wrappers, org.eclipse.jetty.compression:jetty-compression-gzip, org.eclipse.jetty.compression:jetty-compression-server, aws-java-sdk-sts, jjwt-impl, jjwt-jackson, jwks-rsa, io.jsonwebtoken:jjwt-api, org.apache.kerby:kerb-simplekdc, commonmark-ext-heading-anchor, jakarta.validation-api, client-java, commons-logging, docker-java-core, io.opentelemetry:opentelemetry-bom, io.prometheus:simpleclient, jcl-over-slf4j, log4j-layout-template-json, org.apache.logging.log4j:log4j-bom, simpleclient_hotspot, simpleclient_servlet, slf4j-bom, io.opentelemetry:opentelemetry-sdk, org.apache.logging.log4j:log4j-core, github.com/prometheus/client_model, github.com/sirupsen/logrus, io.opentelemetry:opentelemetry-exporter-prometheus, io.opentelemetry.semconv:opentelemetry-semconv
- Only in OpenMetadata: React, Vite, Flask, apache-client, com.mysql:mysql-connector-j, docker-java-transport-zerodep, elasticache, lettuce-core, org.flywaydb:flyway-mysql, PostgreSQL, redshift-jdbc42, s3, tomcat-jdbc, Redis, Postgres, com.zaxxer:HikariCP, Flyway, MySQL, com.azure:azure-storage-blob, net.jodah:expiringmap, software.amazon.awssdk:rds, Elasticsearch, Google, jersey-server, jetty-ee10-bom, org.springframework:spring-beans, io.dropwizard:dropwizard-core, Spring, org.eclipse.jetty:jetty-http, org.eclipse.jetty:jetty-io, Tailwind CSS, guicey-jdbi3, jdbi3-sqlobject, jsqlparser, org.jdbi:jdbi3-core, io.dropwizard:dropwizard-jdbi3, com.google.auth:google-auth-library-oauth2-http, google-oauth-client, nimbus-jose-jwt, oauth2-oidc-sdk, software.amazon.awssdk:auth, com.unboundid:unboundid-ldapsdk, com.azure:azure-identity, com.microsoft.azure:msal4j, org.passay:passay, software.amazon.awssdk:secretsmanager, software.amazon.awssdk:sts, Model Context Protocol, io.modelcontextprotocol.sdk:mcp-json-jackson2, angus-mail, commonmark-ext-autolink, commonmark-ext-gfm-strikethrough, owasp-java-html-sanitizer, poi-ooxml, com.github.jknack:handlebars, Apache, org.freemarker:freemarker, com.opencsv:opencsv, com.vladsch.flexmark:flexmark-html2md-converter, org.apache.pdfbox:pdfbox, org.apache.poi:poi, org.jsoup:jsoup, org.simplejavamail:simple-java-mail, everit-json-schema, jakarta.validation:jakarta.validation-api, com.networknt:json-schema-validator, org.jsonschema2pojo:jsonschema2pojo-core, javax.validation:validation-api, Hibernate, log4j-core, micrometer-observation, micrometer-registry-prometheus, slf4j-simple, io.micrometer:micrometer-core, io.fabric8:kubernetes-client, ch.qos.logback:logback-classic, ch.qos.logback:logback-core, io.kubernetes:client-java, software.amazon.awssdk:ssm

## Side by side

| | pulsar | OpenMetadata |
|---|---|---|
| Size | 1,232,950 lines written, 2,913 code files | 2,166,002 lines written, 4,688 code files |
| Who writes it | 0.2% of its commits signed by AI. With Claude Code, GitHub Copilot, and Cursor | 8.8% of its commits signed by AI. With Claude Code, GitHub Copilot, Cursor, and Jules |
| Activity | Last push November 8, 2026, 15,517 commits, 15,359 stars | Last push November 7, 2026, 20,467 commits, 15,711 stars |
| Tests | 2,292 test files. 63.3% of its code files have a test that imports them | 4,066 test files. 62.6% 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, pulsar or OpenMetadata?

OpenMetadata, with 2,166,002 lines written; pulsar has 1,232,950.

The proof: [open-metadata/OpenMetadata's code at commit 3aaedca](https://github.com/open-metadata/OpenMetadata/tree/3aaedcaaf8705462a8cdc74d01fde259dd56eba7)

### Which has more GitHub stars, pulsar or OpenMetadata?

OpenMetadata, with 15,711 stars; pulsar has 15,359.

The proof: [open-metadata/OpenMetadata on GitHub](https://github.com/open-metadata/OpenMetadata)

### Which has more tests, pulsar or OpenMetadata?

OpenMetadata, with 4,066 test files; pulsar has 2,292.

The proof: [open-metadata/OpenMetadata's code at commit 3aaedca](https://github.com/open-metadata/OpenMetadata/tree/3aaedcaaf8705462a8cdc74d01fde259dd56eba7)

### Which was updated more recently, pulsar or OpenMetadata?

pulsar: its last push was on November 8, 2026, and OpenMetadata's on November 7, 2026.

The proof: [apache/pulsar's commits on GitHub](https://github.com/apache/pulsar/commits)

### Which has more commits signed by AI, pulsar or OpenMetadata?

OpenMetadata: an AI signed 8.8% of its commits, with Claude Code, GitHub Copilot, Cursor, and Jules; in pulsar, 0.2%.

The proof: [the commits each tool signed in open-metadata/OpenMetadata](https://seerepo.com/r/open-metadata/OpenMetadata/ai)

## Sources

- apache/pulsar: Read on November 8, 2026, at commit 1b6377e (https://github.com/apache/pulsar/tree/1b6377e26427990a9243000ab2c5a4b9ae488b3f)
- open-metadata/OpenMetadata: Read on November 7, 2026, at commit 3aaedca (https://github.com/open-metadata/OpenMetadata/tree/3aaedcaaf8705462a8cdc74d01fde259dd56eba7)

## 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.