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https://issues.apache.org/jira/browse/HADOOP-16085?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16843553#comment-16843553
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Hudson commented on HADOOP-16085:
---------------------------------
SUCCESS: Integrated in Jenkins build Hadoop-trunk-Commit #16572 (See
[https://builds.apache.org/job/Hadoop-trunk-Commit/16572/])
HADOOP-16085. S3Guard: use object version or etags to protect against (stevel:
rev a36274d69947648dbe82721220cc5240ec5d396d)
* (add)
hadoop-tools/hadoop-aws/src/test/java/org/apache/hadoop/fs/s3a/s3guard/TestObjectChangeDetectionAttributes.java
* (edit)
hadoop-tools/hadoop-aws/src/test/java/org/apache/hadoop/mapreduce/filecache/TestS3AResourceScope.java
* (edit) hadoop-tools/hadoop-aws/src/site/markdown/tools/hadoop-aws/s3guard.md
* (add)
hadoop-tools/hadoop-aws/src/main/java/org/apache/hadoop/fs/s3a/impl/CopyOutcome.java
* (edit)
hadoop-tools/hadoop-aws/src/test/java/org/apache/hadoop/fs/s3a/ITestS3ADelayedFNF.java
* (edit)
hadoop-tools/hadoop-aws/src/main/java/org/apache/hadoop/fs/s3a/impl/ChangeDetectionPolicy.java
* (edit)
hadoop-tools/hadoop-aws/src/test/java/org/apache/hadoop/fs/s3a/ITestS3GuardOutOfBandOperations.java
* (edit)
hadoop-tools/hadoop-aws/src/main/java/org/apache/hadoop/fs/s3a/s3guard/DirListingMetadata.java
* (edit)
hadoop-tools/hadoop-aws/src/main/java/org/apache/hadoop/fs/s3a/s3guard/PathMetadata.java
* (edit)
hadoop-tools/hadoop-aws/src/main/java/org/apache/hadoop/fs/s3a/S3ObjectAttributes.java
* (edit)
hadoop-tools/hadoop-aws/src/test/java/org/apache/hadoop/fs/s3a/select/ITestS3SelectCLI.java
* (edit)
hadoop-tools/hadoop-aws/src/main/java/org/apache/hadoop/fs/s3a/s3guard/DDBPathMetadata.java
* (edit)
hadoop-tools/hadoop-aws/src/test/java/org/apache/hadoop/fs/s3a/s3guard/TestPathMetadataDynamoDBTranslation.java
* (edit)
hadoop-tools/hadoop-aws/src/main/java/org/apache/hadoop/fs/s3a/s3guard/S3Guard.java
* (edit)
hadoop-tools/hadoop-aws/src/main/java/org/apache/hadoop/fs/s3a/RemoteFileChangedException.java
* (edit)
hadoop-tools/hadoop-aws/src/main/java/org/apache/hadoop/fs/s3a/impl/ChangeTracker.java
* (edit)
hadoop-tools/hadoop-aws/src/main/java/org/apache/hadoop/fs/s3a/s3guard/S3GuardTool.java
* (edit) hadoop-tools/hadoop-aws/src/site/markdown/tools/hadoop-aws/testing.md
* (edit)
hadoop-tools/hadoop-aws/src/main/java/org/apache/hadoop/fs/s3a/S3AInputStream.java
* (edit)
hadoop-tools/hadoop-aws/src/test/java/org/apache/hadoop/fs/s3a/MockS3AFileSystem.java
* (edit)
hadoop-tools/hadoop-aws/src/test/java/org/apache/hadoop/fs/s3a/select/ITestS3SelectLandsat.java
* (edit)
hadoop-tools/hadoop-aws/src/main/java/org/apache/hadoop/fs/s3a/s3guard/LocalMetadataStore.java
* (edit)
hadoop-tools/hadoop-aws/src/test/java/org/apache/hadoop/fs/s3a/S3ATestUtils.java
* (edit)
hadoop-tools/hadoop-aws/src/main/java/org/apache/hadoop/fs/s3a/Invoker.java
* (edit)
hadoop-tools/hadoop-aws/src/test/java/org/apache/hadoop/fs/s3a/s3guard/ITestDynamoDBMetadataStoreScale.java
* (edit)
hadoop-tools/hadoop-aws/src/main/java/org/apache/hadoop/fs/s3a/WriteOperationHelper.java
* (edit)
hadoop-tools/hadoop-aws/src/main/java/org/apache/hadoop/fs/s3a/Listing.java
* (edit)
hadoop-tools/hadoop-aws/src/main/java/org/apache/hadoop/fs/s3a/S3AFileStatus.java
* (edit)
hadoop-tools/hadoop-aws/src/test/java/org/apache/hadoop/fs/s3a/s3guard/TestS3Guard.java
* (edit)
hadoop-tools/hadoop-aws/src/site/markdown/tools/hadoop-aws/committers.md
* (edit)
hadoop-tools/hadoop-aws/src/test/java/org/apache/hadoop/fs/s3a/ITestS3GuardListConsistency.java
* (edit)
hadoop-tools/hadoop-aws/src/test/java/org/apache/hadoop/fs/s3a/TestStreamChangeTracker.java
* (edit)
hadoop-tools/hadoop-aws/src/test/java/org/apache/hadoop/fs/s3a/s3guard/AbstractS3GuardToolTestBase.java
* (edit)
hadoop-tools/hadoop-aws/src/test/java/org/apache/hadoop/fs/s3a/AbstractS3AMockTest.java
* (edit)
hadoop-tools/hadoop-aws/src/test/java/org/apache/hadoop/fs/s3a/s3guard/MetadataStoreTestBase.java
* (edit)
hadoop-tools/hadoop-aws/src/main/java/org/apache/hadoop/fs/s3a/s3guard/DescendantsIterator.java
* (edit)
hadoop-tools/hadoop-aws/src/test/java/org/apache/hadoop/fs/s3a/s3guard/ITestS3GuardToolLocal.java
* (edit)
hadoop-tools/hadoop-aws/src/site/markdown/tools/hadoop-aws/troubleshooting_s3a.md
* (edit)
hadoop-tools/hadoop-aws/src/test/java/org/apache/hadoop/fs/s3a/s3guard/TestLocalMetadataStore.java
* (edit)
hadoop-tools/hadoop-aws/src/test/java/org/apache/hadoop/fs/s3a/select/ITestS3SelectMRJob.java
* (edit)
hadoop-tools/hadoop-aws/src/test/java/org/apache/hadoop/fs/s3a/ITestS3ARemoteFileChanged.java
* (edit) hadoop-tools/hadoop-aws/pom.xml
* (edit)
hadoop-tools/hadoop-aws/src/main/java/org/apache/hadoop/fs/s3a/s3guard/DynamoDBMetadataStore.java
* (edit)
hadoop-tools/hadoop-aws/src/test/java/org/apache/hadoop/fs/s3a/TestListing.java
* (edit)
hadoop-tools/hadoop-aws/src/test/java/org/apache/hadoop/fs/s3a/s3guard/TestDirListingMetadata.java
* (edit)
hadoop-tools/hadoop-aws/src/main/java/org/apache/hadoop/fs/s3a/s3guard/MetadataStoreListFilesIterator.java
* (edit) hadoop-common-project/hadoop-common/src/main/resources/core-default.xml
* (edit)
hadoop-tools/hadoop-aws/src/site/markdown/tools/hadoop-aws/delegation_tokens.md
* (edit)
hadoop-tools/hadoop-aws/src/test/java/org/apache/hadoop/fs/s3a/ITestS3AInconsistency.java
* (edit)
hadoop-tools/hadoop-aws/src/main/java/org/apache/hadoop/fs/s3a/s3guard/PathMetadataDynamoDBTranslation.java
* (edit)
hadoop-tools/hadoop-aws/src/test/java/org/apache/hadoop/fs/s3a/s3guard/ITestDynamoDBMetadataStore.java
* (add)
hadoop-tools/hadoop-aws/src/main/java/org/apache/hadoop/fs/s3a/S3ALocatedFileStatus.java
* (edit)
hadoop-tools/hadoop-aws/src/main/java/org/apache/hadoop/fs/s3a/S3GuardExistsRetryPolicy.java
* (edit)
hadoop-tools/hadoop-aws/src/main/java/org/apache/hadoop/fs/s3a/S3AFileSystem.java
* (edit)
hadoop-tools/hadoop-aws/src/test/java/org/apache/hadoop/fs/s3a/scale/AbstractITestS3AMetadataStoreScale.java
* (edit)
hadoop-tools/hadoop-aws/src/main/java/org/apache/hadoop/fs/s3a/S3AUtils.java
> S3Guard: use object version or etags to protect against inconsistent read
> after replace/overwrite
> -------------------------------------------------------------------------------------------------
>
> Key: HADOOP-16085
> URL: https://issues.apache.org/jira/browse/HADOOP-16085
> Project: Hadoop Common
> Issue Type: Sub-task
> Components: fs/s3
> Affects Versions: 3.2.0
> Reporter: Ben Roling
> Assignee: Ben Roling
> Priority: Major
> Fix For: 3.3.0
>
> Attachments: HADOOP-16085-003.patch, HADOOP-16085_002.patch,
> HADOOP-16085_3.2.0_001.patch
>
>
> Currently S3Guard doesn't track S3 object versions. If a file is written in
> S3A with S3Guard and then subsequently overwritten, there is no protection
> against the next reader seeing the old version of the file instead of the new
> one.
> It seems like the S3Guard metadata could track the S3 object version. When a
> file is created or updated, the object version could be written to the
> S3Guard metadata. When a file is read, the read out of S3 could be performed
> by object version, ensuring the correct version is retrieved.
> I don't have a lot of direct experience with this yet, but this is my
> impression from looking through the code. My organization is looking to
> shift some datasets stored in HDFS over to S3 and is concerned about this
> potential issue as there are some cases in our codebase that would do an
> overwrite.
> I imagine this idea may have been considered before but I couldn't quite
> track down any JIRAs discussing it. If there is one, feel free to close this
> with a reference to it.
> Am I understanding things correctly? Is this idea feasible? Any feedback
> that could be provided would be appreciated. We may consider crafting a
> patch.
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