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POAWS S3 Java SDK: detect time/clock skew programmatically?
 

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  1. POAWS S3 Java SDK: detect time/clock skew programmatically?
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    <p>My Android app uses the AWS Java SDK for uploading user photos to S3.</p> <p>Whenever a user's phone's clock is 'skewed', this causes all transfers to fail. This is a well documented aspect of S3:</p> <p><a href="http://aws.amazon.com/articles/1109?_encoding=UTF8&amp;jiveRedirect=1#04" rel="nofollow">http://aws.amazon.com/articles/1109?_encoding=UTF8&amp;jiveRedirect=1#04</a></p> <p>It appears that the upstream S3 service reports this error quite clearly:</p> <blockquote> <p>HTTP Status Code: 403 Forbidden</p> <p>Error Code: RequestTimeToo-Skewed</p> <p>Description: The difference between the request time and the server's time is too large.</p> </blockquote> <p>However when using the Java SDK, it seems as if the informative 403 code is lost ... and I have only an opaque "TransferState.Failed" to go by (which incidentally is the same error if internet connectivity is lost, if it times out, etc...). </p> <p>As far as I can tell from the docs:</p> <p><a href="http://docs.aws.amazon.com/AWSJavaSDK/latest/javadoc/index.html" rel="nofollow">http://docs.aws.amazon.com/AWSJavaSDK/latest/javadoc/index.html</a> <a href="http://docs.aws.amazon.com/AWSJavaSDK/latest/javadoc/com/amazonaws/services/s3/transfer/TransferProgress.html" rel="nofollow">http://docs.aws.amazon.com/AWSJavaSDK/latest/javadoc/com/amazonaws/services/s3/transfer/TransferProgress.html</a> <a href="http://docs.aws.amazon.com/AWSJavaSDK/latest/javadoc/com/amazonaws/services/s3/transfer/Transfer.TransferState.html" rel="nofollow">http://docs.aws.amazon.com/AWSJavaSDK/latest/javadoc/com/amazonaws/services/s3/transfer/Transfer.TransferState.html</a> <a href="http://docs.aws.amazon.com/AWSJavaSDK/latest/javadoc/com/amazonaws/services/s3/transfer/Upload.html" rel="nofollow">http://docs.aws.amazon.com/AWSJavaSDK/latest/javadoc/com/amazonaws/services/s3/transfer/Upload.html</a></p> <p>There is no way to get the additional "RequestTimeToo-Skewed" metadata about a transfer failure.</p> <p>Am I missing it? Is there any way to get additional error information when an S3 transfer fails using Amazon's Java SDK?</p> <p><strong>UPDATE #1:</strong> A commenter kindly highlighted that I should clarity two points:</p> <ul> <li>I am actually using the AWS SDK for Android (which seems very similar to the Java SDK, but is nonetheless distinct)</li> <li>I am using the TransferManager class to perform my upload. Apparently, this is a high-level class that wraps the lower-level AmazonS3Client ... and this lower-level class should expose the error reporting I need, but I am still investigating the exact tradeoffs involved between TransferManager and AmazonS3Client. As far as I can tell, there is no way to get progress information via the (synchronous) AmazonS3Client.putObjectRequest which would be a blocker for me...</li> </ul> <p><strong>UPDATE #2:</strong> My sincere thanks to Jason (of the AWS SDK team) for stopping by and helping me out here. The important information is, indeed, available as properties on an AmazonS3Exception if you use certain methods. The docs had originally confused me and I thought that a manual Thread.sleep() loop was required to poll status (and thus I could not leverage waitForCompletion or waitForException), but if you use ProgressListener on PutObjectRequest you can get full progress callbacks and the error-fidelity of AmazonS3Exception. </p>
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      1. USSteffen Opel
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    1. COIt seems like you are using `TransferManager` instead of the low level `AmazonS3Client`. You should clearly mention this in your question. The low level client throws `AmazonServiceException` that contains `errorCode` and `statusCode`. Also, is there a particular reason why you use the AWS SDK for Java instead of the AWS SDK for Android?
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      1. USYosuke Matsuda
    2. COHi @YosukeMatsuda - thanks for responding. Yes my mistake, I am actually using the AWS (Java) SDK for Android. Let me take a quick look at AmazonS3Client...
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    3. CO@YosukeMatsuda Looking at AmazonS3Client, is it possible to get transfer progress using this API? I use that to show my users a progress dialog during the upload, which is critical as many of my users have poor wireless connections and some indication of status/progress/bandwidth really helps... Is there a good document somewhere on the exact tradeoffs between AmazonS3Client and TransferManager?
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