[jira] [Created] (HADOOP-14226) S3Guard: ITestDynamoDBMetadataStoreScale is not cleaning up test data

["Mingliang Liu (JIRA)" <ji...@apache.org>]

Mingliang Liu created HADOOP-14226:
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             Summary: S3Guard: ITestDynamoDBMetadataStoreScale is not cleaning up test data
                 Key: HADOOP-14226
                 URL: https://issues.apache.org/jira/browse/HADOOP-14226
             Project: Hadoop Common
          Issue Type: Sub-task
          Components: fs/s3
    Affects Versions: HADOOP-13345
            Reporter: Mingliang Liu
            Assignee: Mingliang Liu


After running {{ITestDynamoDBMetadataStoreScale}}, the test data is not cleaned up. There is a call to {{clearMetadataStore(ms, count);}} in the finally clause though. The reason is that, the internally called method {{DynamoDBMetadataStore::deleteSubtree()}} is assuming there should be an item for the parent dest path:
{code}
parent=/fake-bucket, child=moved-here, is_dir=true
{code}

In DynamoDBMetadataStore implementation, we assume that _if a path exists, all its ancestors will also exist in the table_. We need to pre-create dest path to maintain this invariant so that test data can be cleaned up successfully.

I think there may be other tests with the same problem. Let's identify/address them separately.



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