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Also mmap cfs files for hybridfs #38940

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Commits on Feb 15, 2019

  1. Also mmap cfs files for hybridfs

    With this commit we add the `.cfs` file extension to the list of file
    types that are memory-mapped by hybridfs. `.cfs` files combine all files
    of a Lucene segment into a single file in order to save file handles. As
    this strategy is only used for "small" segments (less than 10% of the
    shard size), it is benefical to memory-map them instead of accessing
    them via NIO.
    
    Relates elastic#36668
    danielmitterdorfer committed Feb 15, 2019
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