ade created HDFS-9666:
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Summary: Enable hdfs-client to read even remote SSD/RAM prior to
local disk replica to improve random read
Key: HDFS-9666
URL: https://issues.apache.org/jira/browse/HDFS-9666
Project: Hadoop HDFS
Issue Type: Improvement
Components: hdfs-client
Affects Versions: 2.7.0, 2.6.0
Reporter: ade
Assignee: ade
Fix For: 2.6.3
We want to improve random read performance of HDFS for HBase, so enabled the
heterogeneous storage in our cluster. But there are only ~50% of datanode &
regionserver hosts with SSD. we can set hfile with only ONE_SSD not ALL_SSD
storagepolicy and the regionserver on none-SSD host can only read the local
disk replica . So we developed this feature in hdfs client to read even remote
SSD/RAM prior to local disk replica.
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