HADOOP-15183 S3Guard store becomes inconsistent after partial failure of rename#843

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steveloughran wants to merge 15 commits intoapache:trunkfrom

steveloughran:s3/HADOOP-15183-s3guard-rename-failures

Commits on Jun 11, 2019

HADOOP-15183 code is merged with trunk
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HADOOP-15183. YARN-9568 is causing NPEs in MiniYarnCluster launch. Without fixing it, do at least avoid teardown errors
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HADOOP-115183 checkstyle from latest yetus run
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HADOOP-15183: making addAncestors aware of the BulkOperationState
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HADOOP-15183 code review
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HADOOP-15183: ongoing stabilisation
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HADOOP-15183 checkstyle and javadocs
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HADOOP-15183 changes after review with fabbri
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HADOOP-15183: force in a delete tombstone marker into the store before committing a job, so we can verify that job commits remove them
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HADOOP-15183 number of records deleted/put during delete/prune operations is tracked
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HADOOP-15183 : tuning the DDB updates
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HADOOP-15183 more on testing, of ancestors including directory put() and generated inconsistency in the same operation.
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HADOOP-15183: more work on DDB tests cleaning up/pruning; the AncestorState failure on a file found is now optionally downgradeable to a warn.
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HADOOP-15183 add OperationState parameter passing down the action.
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HADOOP-15183 address checkstyle and review comments
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