CI服务器上的Maven并发构建

Question

I have an interesting case, in my opinion. We are using maven, and being that we have to support multiple versions of our product we sometimes have a 1.x and 2.x build structure going on. When both 1.x and 2.x are built in parallel, sometimes we see

Error installing artifact's metadata: Error installing metadata: Error updating group repository metadata

From what I can tell, the maven-metadata-local.xml in the local user's repo (for the artifact, not the version of the artifact) is being written to at the same time by another maven process. Is there a way to allow maven to build both of these in parallel, but wait for a write lock on the file to update it?

Answer 1

That sounds that you are using the same local repository for all your build jobs which will not work as you already know. The point in Jenkins/Hudson/CI is to use a local maven repository for every build job. You need to configure in Jenkins using a local maven repository to avoid such situations.

You could also install the Concurrent Safe Local Repository Access maven plugins which will allow you to use the same local repository. (Useful if you are dynamically provisioning the agents)

Answer 2

Use the 2nd or 3rd option under Maven settings (Admin/Configure):

These options come from the: Maven Project Plugin

Answer 3

It's now possible to access repository concurrently starting from maven 3.8.2

Require manual libraries installation & config for concurrent-safe access

Here a snippet to setup maven 3.8 in /opt/mvn with concurrent-safe repo access (local redis installation required). It can be used in Dockerfile RUN or directly:

cd /opt \
  && wget https://dlcdn.apache.org/maven/maven-3/3.8.6/binaries/apache-maven-3.8.6-bin.zip \
  && unzip apache-maven-*.zip && rm apache-maven-*.zip \
  && ln -s /opt/apache-maven-* /opt/mvn \
  && wget https://gist.githubusercontent.com/valodzka/85bc9fa1af8b6f8c876e99267d22933f/raw/4d18ae882cd624382d508c0217682a874a0744b2/redisson-sync-context-urls.txt \
  && wget --directory-prefix=/opt/mvn/lib/ext/redisson --input-file=redisson-sync-context-urls.txt \
  && sed --in-place '/logging/a load ${maven.home}/lib/ext/redisson/*.jar' /opt/mvn/bin/m2.conf \
  && rm redisson-sync-context-urls.txt