apacheapache/hadoop/AGENTS.md

hadoop

AGENTS.md16k starsChanged 3 months agoApache-2.0View on GitHub

This file orients automated and AI-assisted tools working in the Apache Hadoop repository. Ask the user before running Maven or tests directly on the host. Pure Java changes and tests with no native library requirement are fine to run on the host. For anything that needs the native profile or -Drequire.* libraries, prefer the Docker build environment from start-build-env.sh, which is the image Hadoop CI uses; BUILDING.txt documents it, including the non-interactive form: - Without -Dmaven.test.failure.ignore=false (hadoop-project/pom.xml sets it to…

We split this AGENTS.md into the rules it gives an agent

2 rules. About 0 are common, 2 are distinctive, and 0 are very specific to this project.

≈0
Common · estimate
Many files like this have a rule of this kind.
≈2
Distinctive · estimate
This author's own choices. Worth a look.
0
Very specific
Tied to their project's names, files or tools. Probably skip.

Common
Distinctive
Very specific

Distinctive:
Ask the user before running Maven or tests directly on the host.
line 9
Distinctive:
Before investigating, reporting, or acting on any security issue in this repository, you MUST read SECURITY.md.
line 25

≈ “Common” is an estimate: at least 1 in 5 of the 36,368 AGENTS.md files we read have a rule of the same kind, not the same words. “Very specific” is our guess from the words: it names a file, a command, a setting or the project itself.

Keep what fits and drop the rest. Your version, ready for your agents.

Files

AGENTS.md

Apache Hadoop — Guidance for AI Agents

This file orients automated and AI-assisted tools working in the Apache Hadoop repository.

Building and testing

Ask the user before running Maven or tests directly on the host. Pure Java changes and tests with no native library requirement are fine to run on the host. For anything that needs the native profile or -Drequire.* libraries, prefer the Docker build environment from start-build-env.sh, which is the image Hadoop CI uses; BUILDING.txt documents it, including the non-interactive form:

DOCKER_INTERACTIVE_RUN= ./start-build-env.sh ubuntu_24 <command> [args...]

Without -Dmaven.test.failure.ignore=false (hadoop-project/pom.xml sets it to true), Maven exits 0 even when Java tests fail. Check the result from <module>/target/surefire-reports/ or the Tests run: ..., Failures: ... line.

Security

Before investigating, reporting, or acting on any security issue in this repository, you MUST read SECURITY.md.

It defines the Hadoop threat model — the deployments the project defends, the trust boundaries, and what is and is not a vulnerability — along with the rules for vulnerability reports, including additional requirements for AI-generated reports. Findings or reports that fall outside that model will be rejected.

Download now (ZIP)

Jan 8, 2016Get a yarn configuration from commandline29 votes
Jun 19, 2017Building C++ and Java code using CMake and Maven and bundle in a jar11 votes
Aug 2, 2017What is the Kerberos method?6 votes
Sep 10, 2012HDFS: Using HDFS API to append to a SequenceFile6 votes
Mar 10, 2023Write data in S3 using PySpark: after write.mode('overwrite') wrong data is stored4 votes · 1 answer

22 more on Stack Overflow

Dec 17, 2021FileNotFoundException on _temporary/0 directory when saving Parquet files4 votes · 1 answer
Oct 26, 2017YARN API: Getting Yarn Aggregated Logs for application by API4 votes
Dec 28, 2015How does buffer size affect NIO Channel performance?4 votes · 1 answer
Dec 17, 2021FileNotFoundException on _temporary/0 directory when saving Parquet files3 votes
Jun 22, 2021where is core-default.xml file?3 votes
Dec 6, 2018Hadoop name node format warning3 votes
Jul 2, 2018How to know if preemption is happening on Yarn fair share scheduler?3 votes
Apr 12, 2016Why sometimes dependency not contain version property in pom.xml?3 votes
Mar 30, 2016How does spark sc.textfile work in detail?3 votes
Oct 1, 2014Maintaining persistent HDFS in Google Cloud3 votes
Nov 2, 2023Configuring hadoop-azure abfs driver to authenticate with storage accounts as az CLI user2 votes · 1 answer
Oct 5, 2023Apache Flink Azure ABFS File Sink error (streaming) - UnsupportedFileSystemException: No FileSystem for scheme "file"2 votes · 3 answers
Feb 12, 2021Yarn node manager failed with 0xc0000bb82 votes · 1 answer
Oct 31, 2020Setting S3 Bucket permissions when writing between 2 AWS Accounts while running from Glue2 votes
Aug 13, 2019Two ways to read hdfs sequece file, but one failed with EOFException2 votes
Mar 2, 2018Nifi java.lang.NoSuchMethodError: org.apache.hadoop.conf.Configuration.reloadExistingConfigurations2 votes
Apr 6, 2017Fail to read .zip file in spark2 votes
Feb 1, 2017how copyToLocal and copyFromLocal work under the hood2 votes
Jul 11, 2016Kinesis Stream with Empty Records in Google Dataproc with Spark 1.6.1 Hadoop 2.7.22 votes
Apr 7, 2016Modifying Hadoop Terasort Example2 votes
Jun 26, 2024Apache Flink Azure ABFS File Sink error (streaming) - UnsupportedFileSystemException: No FileSystem for scheme "file"1 vote
Feb 14, 2018WebHDFS Java client not handling Kerberos Tokens correctly1 vote · 1 answer

On GitHub · 7

Aug 30, 2021Hadoop Catalog DropTable always returns true and doesn't check that the folder contains Iceberg metadata — apache/iceberg3 reactions · 4 comments
Mar 5, 2025HDDS-12462. Use exclude rules for defining shaded filesystem jar contents — apache/ozone2 reactions · 11 comments
Nov 14, 2025Hadoop S3A tests should be added to CI — noobaa/noobaa-core1 reaction · 3 comments
Sep 25, 2025Implement stub functions: ofs_ozone_connect, ofs_ozone_get_volume, ofs_ozone_get_bucket, ofs_ozone_head_key, ofs_ozone_disconnect — jojochuang/nfs-ganesha1 reaction
Apr 22, 2025Test index and match some Apache projects — aboutcode-org/purldb1 reaction

2 more on GitHub

Apr 23, 2019Avoid file rename when pushing segments with HDFSDataPusher with UUID — apache/druid1 reaction · 2 comments
Aug 1, 2017Support SPARK_USER for specifying usernames to HDFS — apache-spark-on-k8s/spark1 reaction · 3 comments

On YouTube · 3

Sep 11, 2018Evolution of Apache Hadoop (September 11, 2018) — Steven Van Vaerenbergh90 views
Dec 23, 2020Apache Hadoop Development History | Gource Git Visualization — Nitin Kumar57 views
Jun 8, 2026I Visualized Hadoop's Heartbeat: It's Wild! ❤️‍🔥 — CodeTimelapse5 views

Where files are headingNew AGENTS.md files have more rules about keeping secrets out of the code, and fewer about code style.
Of the AGENTS.md files we read, the 28,693 first seen in the last six months, against the older ones: the kind of rule that gained most share, and the kind that lost most. About files like this in general, not this one, and an estimate, since a kind is a pattern in the words.

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Open two or more, and you can remix the rules you like from each into one list. Kept in this browser only.

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