[jira] [Updated] (ARROW-15340) [C++] Try and fetch IPC footer in one read instead of two

["David Li (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-15340?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

David Li updated ARROW-15340:
-----------------------------
    Labels: good-second-issue  (was: )

> [C++] Try and fetch IPC footer in one read instead of two
> ---------------------------------------------------------
>
>                 Key: ARROW-15340
>                 URL: https://issues.apache.org/jira/browse/ARROW-15340
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: C++
>            Reporter: Weston Pace
>            Priority: Major
>              Labels: good-second-issue
>
> To concisely read the IPC footer we must do two reads.  First read the footer length and then read the footer contents.
> On high latency filesystems we can cut down some of this startup time by assuming the footer is going to be relatively small and reading the last ~1MB of the file.  Then we only need to do two reads if the footer is larger.
> This means most of the time we can usually get away with 1 read at the expense of possibly reading more data than needed.



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