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From "Fangyuan Deng (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-11942) make new chooseDataNode policy work in more operation like seek, fetch
Date Wed, 07 Jun 2017 07:36:18 GMT

     [ https://issues.apache.org/jira/browse/HDFS-11942?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Fangyuan Deng updated HDFS-11942:
---------------------------------
    Target Version/s: 2.7.3

> 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: 2.6.0, 2.7.0
>            Reporter: Fangyuan Deng
>         Attachments: HDFS-11942.0.patch
>
>
> 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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