Sean Mackrory created HADOOP-14023:
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             Summary: S3Guard: 
                 Key: HADOOP-14023
                 URL: https://issues.apache.org/jira/browse/HADOOP-14023
             Project: Hadoop Common
          Issue Type: Bug
            Reporter: Sean Mackrory


When you specify a DynamoDB endpoint instead of it using the same one as the S3 
bucket, it thinks the region is "dynamodb":

{code}
> bin/hadoop s3a init -m dynamodb://region-test
2017-01-25 11:41:28,006 INFO s3guard.S3GuardTool: create metadata store: 
dynamodb://region-test scheme: dynamodb
2017-01-25 11:41:28,116 WARN util.NativeCodeLoader: Unable to load 
native-hadoop library for your platform... using builtin-java classes where 
applicable
2017-01-25 11:41:29,421 INFO s3guard.DynamoDBMetadataStore: Creating 
non-existent DynamoDB table region-test in region dynamodb
2017-01-25 11:41:34,637 INFO s3guard.S3GuardTool: Metadata store 
DynamoDBMetadataStore{region=dynamodb, tableName=region-test} is initialized.
{code}

My guess is it's because of DynamoDBMetadataStore.initialize will call 
getEndpointPrefix, and all the published endpoints for DynamoDB actually start 
with dynamodb.



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