[jira] [Commented] (HADOOP-18577) ABFS: add probes of readahead fix

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

    [ https://issues.apache.org/jira/browse/HADOOP-18577?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17648167#comment-17648167 ] 

ASF GitHub Bot commented on HADOOP-18577:
-----------------------------------------

steveloughran commented on PR #5205:
URL: https://github.com/apache/hadoop/pull/5205#issuecomment-1353423907

   merged; created an explict new jira for this, HADOOP-18577, referring to original patch and overall issue in commit message for easy location




> ABFS: add probes of readahead fix
> ---------------------------------
>
>                 Key: HADOOP-18577
>                 URL: https://issues.apache.org/jira/browse/HADOOP-18577
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: fs/azure
>    Affects Versions: 3.3.5
>            Reporter: Steve Loughran
>            Assignee: Steve Loughran
>            Priority: Major
>
> Followup patch as to  HADOOP-18456 to
> aid in probing for read correctness of
> hadoop ABFS client across different releases.
> * ReadBufferManager constructor logs the fact it is safe at TRACE
> * AbfsInputStream declares it is fixed in toString()
>   by including fs.azure.capability.readahead.safe" in the
>   result.
> The ABFS FileSystem hasPathCapability("fs.azure.capability.readahead.safe")
> probe returns true to indicate the client's readahead manager has been fixed
> to be safe when prefetching.
> All Hadoop releases for which probe this returns false
> and for which the probe "fs.capability.etags.available"
> returns true at risk of returning invalid data when reading
> ADLS Gen2/Azure storage data.



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