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[SPARK-22227][CORE] DiskBlockManager.getAllBlocks now tolerates temp …
…files ## What changes were proposed in this pull request? Prior to this commit getAllBlocks implicitly assumed that the directories managed by the DiskBlockManager contain only the files corresponding to valid block IDs. In reality, this assumption was violated during shuffle, which produces temporary files in the same directory as the resulting blocks. As a result, calls to getAllBlocks during shuffle were unreliable. The fix could be made more efficient, but this is probably good enough. ## How was this patch tested? `DiskBlockManagerSuite` Author: Sergei Lebedev <s.lebedev@criteo.com> Closes apache#19458 from superbobry/block-id-option.
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