nuno-faria opened a new pull request, #17031:
URL: https://github.com/apache/datafusion/pull/17031
## Which issue does this PR close?
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- Closes #17001.
## Rationale for this change
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Why are you proposing this change? If this is already explained clearly in
the issue then this section is not needed.
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Controlling the memory used in the metadata cache prevents unbounded growth,
which otherwise could even lead to OOM for long-running applications. It uses a
LRU algorithm to evict entries.
The limit can be set with the runtime config
`datafusion.runtime.file_metadata_cache_limit` (e.g., `set
datafusion.runtime.file_metadata_cache_limit = '1G'`).
## What changes are included in this PR?
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sometimes worth providing a summary of the individual changes in this PR.
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- Added the `datafusion.runtime.file_metadata_cache_limit` config (defaults
to '1G').
- Added the `lru` crate to implement the LRU semantics.
- Added memory related methods to the `FileMetadata` and `FileMetadataCache`
traits.
- Updated the `DefaultFilesMetadataCache` struct to limit the memory used.
- Updated the `CachedParquetMetaData` struct to provide the Parquet metadata
size.
- Added unit tests.
## Are these changes tested?
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Yes
## Are there any user-facing changes?
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Added a new runtime config to control the metadata cache, but since it is
disabled by default, it does not impact existing applications.
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