Tsz Wo Nicholas Sze created HDFS-8361:
-----------------------------------------
Summary: 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
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}
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
