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sst_dump to reduce number of file reads #6836

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sst_dump to reduce number of file reads #6836

wants to merge 2 commits into from

Commits on May 12, 2020

  1. Sst_dump to reduce number of file reads 

    Summary: sst_dump can issue many file reads from the file system. This doesn't work well with file systems without a OS cache, especially remote file systems. In order to mitigate this problem, several improvements are done:
1. --readahead_size is added, so that users can specify readahead size when scanning the data.
2. Force a 512KB tail readahead, which prevents three I/Os for footer, meta index and property blocks and hopefully index and filter blocks too.
3. Consoldiate SSTDump's I/Os before opening the file for read. Use the same file prefetch buffer.

Test Plan: Add a test that covers this new feature.
    @siying
    siying committed May 12, 2020
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  2. Address comments.

    @siying
    siying committed May 12, 2020
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