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https://issues.apache.org/jira/browse/HDFS-13947?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16636187#comment-16636187
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Íñigo Goiri commented on HDFS-13947:
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{{TestBlockReaderLocal}} has been failing for a while but I cannot find a
related JIRA.
{{TestNameNodeMetadataConsistency}} started recently and same business.
Do you mind removing the white spaces in the patch?
> Review of DirectoryScanner Class
> --------------------------------
>
> Key: HDFS-13947
> URL: https://issues.apache.org/jira/browse/HDFS-13947
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: datanode
> Affects Versions: 3.2.0
> Reporter: BELUGA BEHR
> Assignee: BELUGA BEHR
> Priority: Major
> Attachments: HDFS-13947.1.patch, HDFS-13947.2.patch,
> HDFS-13947.3.patch, HDFS-13947.4.patch
>
>
> Review of Directory Scanner. Replaced a lot of code with Guava MultiMap.
> Some general house cleaning and improved logging. For performance, using
> {{ArrayList}} instead of {{LinkedList}} where possible, especially since
> these lists can be quite large a LinkedList will consume a lot of memory and
> be slow to sort/iterate over.
> https://stackoverflow.com/questions/322715/when-to-use-linkedlist-over-arraylist-in-java
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