Steve Lawrence created DAFFODIL-1879:
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Summary: Compilation related data structures cannot be garbage
collected due to RuntimeData strong references
Key: DAFFODIL-1879
URL: https://issues.apache.org/jira/browse/DAFFODIL-1879
Project: Daffodil
Issue Type: Bug
Reporter: Steve Lawrence
Fix For: 2.1.0
All the *RuntimeData and DPathCompileInfo constructors accept pass-by-name
parameters. Some of the arguments passed into these constructors reference
objects that are only needed for schema compilation (e.g. dsom, grammar, etc.).
Because they are pass by name, these objects are strong reference and thus
cannot be garbage collected, leading to the entire compilation state being
store in memory.
Fortunately, those parameters are marked as transient and so when serialized
and deserialized they are effectively garbage collected. But if one does not
save/reload a schema, lots of wasted memory used during schema compilation will
stick around. Pass-by-name parameters cannot be vars, so the simple thing of
making them vars and then setting to null does not work. These objects should
be restructured to allow them to be garbage collected once compiled.
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