[jira] [Created] (HDFS-11942) make new chooseDataNode policy work in more operation like seek, fetch

["Fangyuan Deng (JIRA)" <ji...@apache.org>]

Fangyuan Deng created HDFS-11942:
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             Summary: make new  chooseDataNode policy  work in more operation like seek, fetch
                 Key: HDFS-11942
                 URL: https://issues.apache.org/jira/browse/HDFS-11942
             Project: Hadoop HDFS
          Issue Type: Sub-task
          Components: hdfs-client
    Affects Versions: 2.7.0, 2.6.0
            Reporter: Fangyuan Deng


in default policy, if a file is ONE_SSD, client will prior read the local disk replica rather than the remote ssd replica.
but now, the pci-e SSD and 10G ethernet make remote read SSD more faster than  the local disk.
HDFS-9666 give us a patch,  but the code is not complete and not updated for a long time.
this issue give a complete patch and 
we have tested on three machines [ 32 core cpu, 128G mem , 1000M network, 1.2T HDD, 800G SSD(intel P3600) ].
with this feather, throughput of hbase table(ONE_SSD) is double of which without this feather



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