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From "Jason Lowe (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-14138) Remove S3A ref from META-INF service discovery, rely on existing core-default entry
Date Thu, 02 Mar 2017 16:39:45 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-14138?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15892569#comment-15892569
] 

Jason Lowe commented on HADOOP-14138:
-------------------------------------

+1 patch looks good to me.  I agree that this would be a good candidate for 2.8 and 2.7  Will
commit this tomorrow if there are no objections.

Curious why the patch wasn't against trunk instead of branch-2.  Is there a reason this shouldn't
go into trunk?  It applies (mostly) cleanly there, and I see the fs.s3a.impl property is still
in core-default there.


> Remove S3A ref from META-INF service discovery, rely on existing core-default entry
> -----------------------------------------------------------------------------------
>
>                 Key: HADOOP-14138
>                 URL: https://issues.apache.org/jira/browse/HADOOP-14138
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: fs/s3
>    Affects Versions: 2.9.0
>            Reporter: Steve Loughran
>            Assignee: Steve Loughran
>            Priority: Critical
>         Attachments: HADOOP-14138-branch-2-001.patch
>
>
> As discussed in HADOOP-14132, the shaded AWS library is killing performance starting
all hadoop operations, due to classloading on FS service discovery.
> This is despite the fact that there is an entry for fs.s3a.impl in core-default.xml,
*we don't need service discovery here*
> Proposed:
> # cut the entry from {/hadoop-aws/src/main/resources/META-INF/services/org.apache.hadoop.fs.FileSystem}}
> # when HADOOP-14132 is in, move to that, including declaring an XML file exclusively
for s3a entries
> I want this one in first as its a major performance regression, and one we coula actually
backport to 2.7.x, just to improve load time slightly there too



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