ben-roling commented on issue #794: HADOOP-16085: use object version or etags to protect against inconsistent read after replace/overwrite URL: https://github.com/apache/hadoop/pull/794#issuecomment-491429956 So, now I've added the change to add versionId on the getObjectMetadata() calls: https://github.com/apache/hadoop/pull/794/commits/16a428926fc6b62bfdaae81bb654e582d8ff4169 Following that, I looked into the NPE in copyObject() a bit further. There is already an issue logged: https://github.com/aws/aws-sdk-java/issues/1644 The issue seems to suggest that a 412 response would never actually happen, which implies our simulation of this type of failure is invalid. I need to digest it a bit further.
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