[jira] [Created] (ARROW-14524) [C++] Create plugging/coalescing filesystem wrapper

["Weston Pace (Jira)" <ji...@apache.org>]

Weston Pace created ARROW-14524:
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             Summary: [C++] Create plugging/coalescing filesystem wrapper
                 Key: ARROW-14524
                 URL: https://issues.apache.org/jira/browse/ARROW-14524
             Project: Apache Arrow
          Issue Type: New Feature
          Components: C++
            Reporter: Weston Pace
            Assignee: Weston Pace


We have I/O optimizations scattered across some of our readers.  The most prominent example is prebuffering in the parquet reader.  However, these techniques are rather general purpose and will apply in IPC (see ARROW-14229) as well as other readers (e.g. Orc, maybe even CSV)

This filesystem wrapper will not generally be necessary for local filesystems as the OS' filesystem schedulers are sufficient.  Most of these we can accomplish by simply aiming for some configurable degree of parallelism (e.g. if there are already X requests in progress then start batching).

Goals:

 * Batch consecutive small requests into fewer large requests
   * We could plug (configurably) small holes in read ranges as well
 * Potentially split large requests into concurrent small requests
 * Support for the RandomAccessFile::WillNeed command by prefetching ranges



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