Yuanbo Liu created HDFS-16201:
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Summary: Select datanode based on storage type
Key: HDFS-16201
URL: https://issues.apache.org/jira/browse/HDFS-16201
Project: Hadoop HDFS
Issue Type: Improvement
Reporter: Yuanbo Liu
Assignee: Yuanbo Liu
Since storage policy was introduced into hdfs, it would be useful if hdfs
client could choose datanode of replica based on storage type priority when
reading. The priority should be RAM_DISK > SSD > DISK > ARCHIVE.
Here is the process graph
!https://iwiki.woa.com/download/attachments/979566104/image2021-8-31_20-23-24.png?version=1&modificationDate=1630412605000&api=v2!
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