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From "Virajith Jalaparti (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-13947) Review of DirectoryScanner Class
Date Tue, 02 Oct 2018 23:03:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-13947?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16636209#comment-16636209
] 

Virajith Jalaparti commented on HDFS-13947:
-------------------------------------------

Thanks for working this [~belugabehr].

[~elgoiri] The changes related to the PROVIDED part LGTM.

> 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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