[SPARK-14467][SQL] Experiments: Async I/O in FileScanRDD #12667
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This patch updates FileScanRDD to start reading from the next file while the current file is being processed. The goal is to have better interleaving of CPU and IO. It does this by launching a future which will asynchronously start preparing the next file to be read. The expectation is that the async task is IO intensive and the current file (which includes all the computation for the query plan) is CPU intensive. For some file formats, this would just mean opening the file and the initial setup. For file formats like parquet, this would mean doing all the IO for all the columns.
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Test build #56922 has finished for PR 12667 at commit
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test this please |
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Test build #57265 has finished for PR 12667 at commit
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What changes were proposed in this pull request?
Builds on #12243 to help benchmark improvements by interleaving CPU and I/O in FileScanRDD.
How was this patch tested?
Existing Tests