Stefan Oehme created MNG-6668:
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Summary: Model location handling uses too much memory
Key: MNG-6668
URL: https://issues.apache.org/jira/browse/MNG-6668
Project: Maven
Issue Type: Bug
Components: core
Reporter: Stefan Oehme
Every model element in Maven has one or several Location objects associated
with it. These locations specify where in the POM each attribute of that object
was configured. This is a very useful feature for better error messages and IDE
assistance, but its current implementation takes too much memory.
Locations are currently tracked with a LinkedHashMap, with String keys and
Location values. LinkedHashMap has a large overhead per entry. In a
particularly large build that I was investigating, just this overhead summed up
to almost 3GB of memory. However, there is actually no need for arbitrary
Strings or a Map. The keys are always the name of the corresponding field in
the model class. So instead we could create one Location field for every actual
data field in the model and then switch over the String key to assign the
Location to the correct field. This would get rid of the LinkedHashMap overhead
altogether. It would add a small overhead for modello users who don't care
about location handling, but I assume that Maven is the only major consumer of
it.
See [https://github.com/codehaus-plexus/modello/pull/31] and
[https://github.com/apache/maven/pull/252]
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