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https://issues.apache.org/jira/browse/HDFS-8361?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14588188#comment-14588188
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Hudson commented on HDFS-8361:
------------------------------
FAILURE: Integrated in Hadoop-Mapreduce-trunk-Java8 #228 (See
[https://builds.apache.org/job/Hadoop-Mapreduce-trunk-Java8/228/])
HDFS-8361. Choose SSD over DISK in block placement. (szetszwo: rev
175e6d120fc34710048c2e9512dd270410172803)
*
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestBlockStoragePolicy.java
*
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/StorageType.java
* hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
> Choose SSD over DISK in block placement
> ---------------------------------------
>
> Key: HDFS-8361
> URL: https://issues.apache.org/jira/browse/HDFS-8361
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: namenode
> Reporter: Tsz Wo Nicholas Sze
> Assignee: Tsz Wo Nicholas Sze
> Fix For: 2.7.1
>
> Attachments: h8361_20150508.patch, h8361_20150612.patch
>
>
> BlockPlacementPolicyDefault chooses the StorageType by iterating the given
> StorageType EnumMap in its natural order (the order in which the enum
> constants are declared). So DISK will be chosen over SSD in One-SSD policy
> since DISK is declared before SSD as shown below. We should choose SSD first.
> {code}
> public enum StorageType {
> DISK(false),
> SSD(false),
> ARCHIVE(false),
> RAM_DISK(true);
> ...
> }
> {code}
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