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https://issues.apache.org/jira/browse/HADOOP-14096?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15875074#comment-15875074
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Aaron Fabbri commented on HADOOP-14096:
---------------------------------------
Starting work on the unit test and fix for this.
> s3guard: regression in dirListingUnion
> --------------------------------------
>
> Key: HADOOP-14096
> URL: https://issues.apache.org/jira/browse/HADOOP-14096
> Project: Hadoop Common
> Issue Type: Sub-task
> Components: fs/s3
> Affects Versions: HADOOP-13345
> Reporter: Aaron Fabbri
> Assignee: Aaron Fabbri
> Priority: Critical
>
> Just noticed HADOOP-14020 introduced a bug in S3Guard#dirListingUnion.
> The offending change is here:
> {noformat}
> - if (dirMeta.get(s.getPath()) == null) {
> - dirMeta.put(s);
> - }
> + changed = changed || dirMeta.put(s);
> + }
> +
> {noformat}
> hint: Logical OR is a short-circuit operator.
> Easy fix, but should probably come with a unit test for dirListingUnion().
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