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https://issues.apache.org/jira/browse/HDFS-13947?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16636165#comment-16636165
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BELUGA BEHR commented on HDFS-13947:
------------------------------------
{code}
org.apache.hadoop.hdfs.client.impl.TestBlockReaderLocal.testStatisticsForErasureCodingRead
Ran a couple of times locally and it eventually passed.
[INFO] -------------------------------------------------------
[INFO] T E S T S
[INFO] -------------------------------------------------------
[INFO] Running org.apache.hadoop.hdfs.client.impl.TestBlockReaderLocal
[WARNING] Tests run: 38, Failures: 0, Errors: 0, Skipped: 37, Time elapsed:
12.324 s - in org.apache.hadoop.hdfs.client.impl.TestBlockReaderLocal
[INFO]
[INFO] Results:
[INFO]
[WARNING] Tests run: 38, Failures: 0, Errors: 0, Skipped: 37
{code}
{code}
hadoop.hdfs.server.namenode.TestNameNodeMetadataConsistency
Failed locally, even without patch applied.
{code}
Please accept this patch (and remove the white space). Thanks!
> 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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