[python] Cache Blob indexes to avoid repeated footer reads - #9129
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XiaoHongbo-Hope wants to merge 2 commits into
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[python] Cache Blob indexes to avoid repeated footer reads#9129XiaoHongbo-Hope wants to merge 2 commits into
XiaoHongbo-Hope wants to merge 2 commits into
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XiaoHongbo-Hope
marked this pull request as ready for review
August 9, 2026 09:05
XiaoHongbo-Hope
marked this pull request as draft
August 9, 2026 13:07
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Purpose
Follow up on #9125 by caching decoded Blob file indexes in the existing process-local file-format metadata cache.
When a worker reopens the same Blob file, it can reuse the cached lengths and offsets instead of reading and decoding the footer again. The cache remains bounded by
file-format.metadata-cache.max-size; setting it to0 bdisables the cache.Tests
blob_test.pyblob_table_test.pyparquet_metadata_cache_test.py