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@@ -388,3 +388,8 @@ To run test:
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mvn -Dtests.aws=true -Dtests.config=/path/to/config/file/elasticsearch.yml clean test
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----
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+= AWS VPC Bandwidth Problems
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+
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+AWS instances resolve S3 endpoints to a public IP. If the elasticsearch instances reside in a private subnet in an AWS VPC then all traffic to S3 will go through that VPC's NAT instance. If your VPC's NAT instance is a smaller instance size (e.g. a t1.micro) or is handling a high volume of network traffic your bandwidth to S3 may be limited by that NAT instance's networking bandwidth limitations.
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+
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+Instances residing in a public subnet in an AWS VPC will connect to S3 via the VPC's internet gateway and not be bandwidth limited by the VPC's NAT instance.
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Ryan