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Rajesh Balamohan commented on HADOOP-13727: ------------------------------------------- I have tried out this patch in AWS test environment and fixes the issue. Are you referring to running entire test suite in aws ec2?. > 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 > 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 > > > 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}}. -- This message was sent by Atlassian JIRA (v6.3.4#6332) --------------------------------------------------------------------- To unsubscribe, e-mail: common-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: common-issues-h...@hadoop.apache.org