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https://issues.apache.org/jira/browse/HADOOP-13727?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15604198#comment-15604198
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Hudson commented on HADOOP-13727:
---------------------------------
SUCCESS: Integrated in Jenkins build Hadoop-trunk-Commit #10670 (See
[https://builds.apache.org/job/Hadoop-trunk-Commit/10670/])
HADOOP-13727. S3A: Reduce high number of connections to EC2 Instance (cnauroth:
rev d8fa1cfa6722cbf7a4ec3d6b9c44b034da9aa351)
* (add)
hadoop-tools/hadoop-aws/src/main/java/org/apache/hadoop/fs/s3a/SharedInstanceProfileCredentialsProvider.java
* (edit)
hadoop-tools/hadoop-aws/src/main/java/org/apache/hadoop/fs/s3a/AWSCredentialProviderList.java
* (edit) hadoop-tools/hadoop-aws/src/site/markdown/tools/hadoop-aws/index.md
* (edit) hadoop-common-project/hadoop-common/src/main/resources/core-default.xml
* (edit)
hadoop-tools/hadoop-aws/src/test/java/org/apache/hadoop/fs/s3a/ITestS3AAWSCredentialsProvider.java
* (add)
hadoop-tools/hadoop-aws/src/test/java/org/apache/hadoop/fs/s3a/TestS3AAWSCredentialsProvider.java
* (edit)
hadoop-tools/hadoop-aws/src/test/java/org/apache/hadoop/fs/s3a/S3ATestUtils.java
* (edit)
hadoop-tools/hadoop-aws/src/main/java/org/apache/hadoop/fs/s3a/S3AUtils.java
> S3A: Reduce high number of connections to EC2 Instance Metadata Service
> caused by InstanceProfileCredentialsProvider.
> ---------------------------------------------------------------------------------------------------------------------
>
> Key: HADOOP-13727
> URL: https://issues.apache.org/jira/browse/HADOOP-13727
> Project: Hadoop Common
> Issue Type: Sub-task
> Components: fs/s3
> Reporter: Rajesh Balamohan
> Assignee: Chris Nauroth
> Priority: Minor
> Fix For: 2.8.0, 3.0.0-alpha2
>
> Attachments: HADOOP-13727-branch-2.001.patch,
> HADOOP-13727-branch-2.002.patch, HADOOP-13727-branch-2.003.patch,
> HADOOP-13727-branch-2.004.patch, HADOOP-13727-branch-2.005.patch
>
>
> When running in an EC2 VM, S3A can make use of
> {{InstanceProfileCredentialsProvider}} from the AWS SDK to obtain credentials
> from the EC2 Instance Metadata Service. We have observed that for a highly
> multi-threaded application, this may generate a high number of calls to the
> Instance Metadata Service. The service may throttle the client by replying
> with an HTTP 429 response or forcibly closing connections. We can greatly
> reduce the number of calls to the service by enforcing that all threads use a
> single shared instance of {{InstanceProfileCredentialsProvider}}.
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