[
https://issues.apache.org/jira/browse/MNG-7509?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17564496#comment-17564496
]
ASF GitHub Bot commented on MNG-7509:
-------------------------------------
Yougoss opened a new pull request, #764:
URL: https://github.com/apache/maven/pull/764
Following this checklist to help us incorporate your
contribution quickly and easily:
- [x] Make sure there is a [JIRA
issue](https://issues.apache.org/jira/browse/MNG) filed
for the change (usually before you start working on it). Trivial
changes like typos do not
require a JIRA issue. Your pull request should address just this
issue, without
pulling in other changes.
- [x] Each commit in the pull request should have a meaningful subject line
and body.
- [x] Format the pull request title like `[MNG-XXX] SUMMARY`, where you
replace `MNG-XXX`
and `SUMMARY` with the appropriate JIRA issue. Best practice is to
use the JIRA issue
title in the pull request title and in the first line of the commit
message.
- [x] Write a pull request description that is detailed enough to
understand what the pull request does, how, and why.
- [x] Run `mvn clean verify` to make sure basic checks pass. A more
thorough check will
be performed on your pull request automatically.
- [x] You have run the [Core IT][core-its] successfully.
If your pull request is about ~20 lines of code you don't need to sign an
[Individual Contributor License
Agreement](https://www.apache.org/licenses/icla.pdf) if you are unsure
please ask on the developers list.
To make clear that you license your contribution under
the [Apache License Version 2.0, January
2004](http://www.apache.org/licenses/LICENSE-2.0)
you have to acknowledge this by using the following check-box.
- [x] I hereby declare this contribution to be licenced under the [Apache
License Version 2.0, January 2004](http://www.apache.org/licenses/LICENSE-2.0)
- [x] In any other case, please file an [Apache Individual Contributor
License Agreement](https://www.apache.org/licenses/icla.pdf).
[core-its]: https://maven.apache.org/core-its/core-it-suite/
> Huge memory cost when parent pom widely used in a big project for
> dependencyManagement
> --------------------------------------------------------------------------------------
>
> Key: MNG-7509
> URL: https://issues.apache.org/jira/browse/MNG-7509
> Project: Maven
> Issue Type: Improvement
> Components: Performance
> Reporter: Xiong Luyao
> Priority: Major
> Attachments: image-2022-07-09-09-37-53-823.png,
> image-2022-07-09-09-38-26-354.png, image-2022-07-09-10-27-12-668.png,
> image-2022-07-09-10-27-56-437.png, image-2022-07-09-10-28-05-706.png,
> image-2022-07-09-10-28-22-864.png, image-2022-07-09-10-28-35-341.png,
> image-2022-07-09-10-28-40-612.png, image-2022-07-09-10-29-04-045.png,
> image-2022-07-09-10-29-15-822.png, image-2022-07-09-10-29-21-991.png,
> image-2022-07-09-10-29-46-216.png, image-2022-07-09-10-29-51-456.png
>
>
> When maven try to resolve dependency relationship, it will create many
> objects of dependency / artifact. Even the dependency/artifact content is
> totally same, but just in different models. It cost huge memory if there is a
> big dependencyManagement parent pom in each dependencies of the project.
>
> Here is a real case. As below picture, there is over 3000 business domain
> libraries, each library may rely on several other libraries among them. So
> the library which didn’t rely on each other will be built first and the
> library only relies on the built libraries will be built, until all the
> libraries have been built. In this way, we use a parent pom to maintain the
> version of these 3000+ libraries version and make each library introduce it.
> So that it can keep all the libraries are built from same base.
> But it costs huge memory in above ways to built libraries. And even the
> libraries have been released, if the project which contains a lot of above
> libraries, it also cost huge memory when building project.
>
> !image-2022-07-09-09-37-53-823.png|width=493,height=226!
>
> Here is a thread dump when building a real project with above libraries. The
> top 5 objects are all related to org.eclipse.aether.graph.Dependency.
> !image-2022-07-09-09-38-26-354.png|width=510,height=199!
>
>
--
This message was sent by Atlassian Jira
(v8.20.10#820010)
