Avoid using direct I/O during vector merges #127406
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The vector file isn't reopened during merge operations, so relying on `IOContext` to disable direct I/O during merges is ineffective. This change updates the strategy to explicitly open the vector file twice when direct I/O is enabled: once for default reads and once for direct I/O. We then switch to the appropriate index input in `getMergeInstance`, following the same approach used by other formats.
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Pinging @elastic/es-search-relevance (Team:Search Relevance) |
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Ideally this wouldn't modify |
thecoop
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Apr 28, 2025
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The vector file isn't reopened during merge operations, so relying on
IOContextto disable direct I/O during merges is ineffective. This change updates the strategy to explicitly open the vector file twice when direct I/O is enabled: once for default reads and once for direct I/O. We then switch to the appropriate index input ingetMergeInstance, following the same approach used by other formats.Direct I/O support for vectors is not yet released so marking this PR as non-issue for now.