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From "Chris Nauroth (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-13727) S3A: Reduce high number of connections to EC2 Instance Metadata Service caused by InstanceProfileCredentialsProvider.
Date Tue, 25 Oct 2016 04:34:59 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-13727?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Chris Nauroth updated HADOOP-13727:
-----------------------------------
    Fix Version/s: 3.0.0-alpha2

> 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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