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https://issues.apache.org/jira/browse/HADOOP-13793?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15723679#comment-15723679
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Mingliang Liu commented on HADOOP-13793:
----------------------------------------

Another nit is that the DefaultS3ClientFactory should have only one javadoc.

{code}
39      /**
40       * The default factory implementation, which calls the AWS SDK to 
configure
41       * and create an {@link AmazonS3Client} that communicates with the S3 
service.
42       */
43      
44      /**
45       * The default factory implementation, which calls the AWS SDK to 
configure
46       * and create an {@link AmazonS3Client} that communicates with the S3 
service.
47       */
{code}

> s3guard: add inconsistency injection, integration tests
> -------------------------------------------------------
>
>                 Key: HADOOP-13793
>                 URL: https://issues.apache.org/jira/browse/HADOOP-13793
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: fs/s3
>            Reporter: Aaron Fabbri
>            Assignee: Aaron Fabbri
>         Attachments: HADOOP-13793-HADOOP-13345.001.patch, 
> HADOOP-13793-HADOOP-13345.002.patch
>
>
> Many of us share concerns that testing the consistency features of S3Guard 
> will be difficult if we depend on the rare and unpredictable occurrence of 
> actual inconsistency in S3 to exercise those code paths.
> I think we should have a mechanism for injecting failure to force exercising 
> of the consistency codepaths in S3Guard.
> Requirements:
> - Integration tests that cause S3A to see the types of inconsistency we 
> address with S3Guard.
> - These are deterministic integration tests.
> Unit tests are possible as well, if we were to stub out the S3Client.  That 
> may be less bang for the buck, though.



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