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