[jira] [Updated] (HADOOP-18517) ABFS: Add fs.azure.enable.readahead option to disable readahead

["ASF GitHub Bot (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HADOOP-18517?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

ASF GitHub Bot updated HADOOP-18517:
------------------------------------
    Labels: pull-request-available  (was: )

> ABFS: Add fs.azure.enable.readahead option to disable readahead
> ---------------------------------------------------------------
>
>                 Key: HADOOP-18517
>                 URL: https://issues.apache.org/jira/browse/HADOOP-18517
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: fs/azure
>    Affects Versions: 3.3.4
>            Reporter: Steve Loughran
>            Assignee: Steve Loughran
>            Priority: Major
>              Labels: pull-request-available
>
> Add an option fs.azure.enable.readahead to allow the abfs readahead to be disabled.
> This has been shipping in cloudera releases, because workloads with heavy random IO don't always benefit from prefetching.
> Pulling this in to ASF hadoop allows for
> * everyone to experiment with/without prefetching
> * ability to disable prefetching if you have problems with it



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