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From "Chris Nauroth (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-14301) Deprecate SharedInstanceProfileCredentialsProvider in branch-2.
Date Wed, 12 Apr 2017 17:00:46 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-14301?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15966210#comment-15966210

Chris Nauroth commented on HADOOP-14301:

This issue is spun off from HADOOP-14248 just for the sake of tracking separate release notes
("removal" vs. "deprecation") in different release lines.  The patch already went through
pre-commit on HADOOP-14248, so we won't wait for pre-commit again here.

> 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
>         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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