[jira] [Created] (HADOOP-14138) Remove S3A ref from META-INF service discovery, rely on existing core-default entry

["Steve Loughran (JIRA)" <ji...@apache.org>]

Steve Loughran created HADOOP-14138:
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             Summary: 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


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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