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From "ade (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-9666) Enable hdfs-client to read even remote SSD/RAM prior to local disk replica to improve random read
Date Wed, 20 Jan 2016 02:28:40 GMT
ade created HDFS-9666:
-------------------------

             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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