[jira] [Resolved] (HADOOP-17347) ABFS: Optimise read for small files/tails of files

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[jira] [Resolved] (HADOOP-17347) ABFS: Optimise read for small files/tails of files

Steve Loughran (Jira)

     [ https://issues.apache.org/jira/browse/HADOOP-17347?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Steve Loughran resolved HADOOP-17347.
    Fix Version/s: 3.4.0
       Resolution: Fixed

IF this is to target branch-3.3 then full test rerun. I'd like some docs too, maybe something on tuning the abfs connector for performance. Too many under-documented config options are coming in now

> ABFS: Optimise read for small files/tails of files
> --------------------------------------------------
>                 Key: HADOOP-17347
>                 URL: https://issues.apache.org/jira/browse/HADOOP-17347
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: fs/azure
>    Affects Versions: 3.4.0
>            Reporter: Bilahari T H
>            Assignee: Bilahari T H
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 3.4.0
>          Time Spent: 12h 10m
>  Remaining Estimate: 0h
> Optimize read performance for the following scenarios
>  # Read small files completely
>  Files that are of size smaller than the read buffer size can be considered as small files. In case of such files it would be better to read the full file into the AbfsInputStream buffer.
>  # Read last block if the read is for footer
>  If the read is for the last 8 bytes, read the full file.
>  This will optimize reads for parquet files. [Parquet file format|https://www.ellicium.com/parquet-file-format-structure/]
> Both these optimizations will be present under configs as follows
>  # fs.azure.read.smallfilescompletely
>  # fs.azure.read.optimizefooterread

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