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From "Mingliang Liu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-14301) Deprecate SharedInstanceProfileCredentialsProvider in branch-2.
Date Wed, 12 Apr 2017 18:08:41 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-14301?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15966310#comment-15966310
] 

Mingliang Liu commented on HADOOP-14301:
----------------------------------------

Thanks [~cnauroth] for the review and commit!

> Deprecate SharedInstanceProfileCredentialsProvider in branch-2.
> ---------------------------------------------------------------
>
>                 Key: HADOOP-14301
>                 URL: https://issues.apache.org/jira/browse/HADOOP-14301
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: fs/s3
>            Reporter: Mingliang Liu
>            Assignee: Mingliang Liu
>             Fix For: 2.9.0
>
>         Attachments: HADOOP-14248-branch-2.002.patch
>
>
> [HADOOP-13727] added the {{SharedInstanceProfileCredentialsProvider}}, which effectively
reduces high number of connections to EC2 Instance Metadata Service caused by {{InstanceProfileCredentialsProvider}}.
That patch, in order to prevent the throttling problem, defined new class {{SharedInstanceProfileCredentialsProvider}}
as a subclass of {{InstanceProfileCredentialsProvider}}, which enforces creation of only a
single instance.
> Per [HADOOP-13050], we upgraded the AWS Java SDK. Since then, the {{InstanceProfileCredentialsProvider}}
in SDK code internally enforces a singleton. {{SharedInstanceProfileCredentialsProvider}}
can be deprecated as of release 2.9.0.



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