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https://issues.apache.org/jira/browse/HADOOP-15827?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16642211#comment-16642211
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Steve Loughran commented on HADOOP-15827:
-----------------------------------------
This is happening in new code from HADOOP-15621; there's a codepath where
dirPathMeta==null but metas!= empty which triggers the NPE.
{code}
return (metas.isEmpty() && dirPathMeta == null)
? null
: new DirListingMetadata(path, metas, isAuthoritative,
dirPathMeta.getLastUpdated());
{code}
[~gabor.bota]: assigning this to you as it seems part of the recent patch
> NPE in DynamoDBMetadataStore.lambda$listChildren for root + auth s3guard
> ------------------------------------------------------------------------
>
> Key: HADOOP-15827
> URL: https://issues.apache.org/jira/browse/HADOOP-15827
> Project: Hadoop Common
> Issue Type: Sub-task
> Components: fs/s3
> Affects Versions: 3.3.0
> Reporter: Steve Loughran
> Priority: Blocker
>
> NPE in a test run of {{-Dparallel-tests -DtestsThreadCount=6 -Ds3guard
> -Ddynamodb -Dauthoritative}}
> {code}
> [ERROR] testLSRootDir(org.apache.hadoop.fs.s3a.ITestS3AFileSystemContract)
> Time elapsed: 42.822 s <<< ERROR!
> java.lang.NullPointerException
> {code}
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