BELUGA BEHR created HDFS-13947:
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Summary: 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
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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