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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-11942) make new chooseDataNode policy work in more operation like seek, fetch
Date Wed, 07 Jun 2017 07:59:18 GMT

    [ https://issues.apache.org/jira/browse/HDFS-11942?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16040444#comment-16040444
] 

Hadoop QA commented on HDFS-11942:
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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | {color:blue} reexec {color} | {color:blue}  0m  0s{color} | {color:blue}
Docker mode activated. {color} |
| {color:red}-1{color} | {color:red} patch {color} | {color:red}  0m  8s{color} | {color:red}
HDFS-11942 does not apply to trunk. Rebase required? Wrong Branch? See https://wiki.apache.org/hadoop/HowToContribute
for help. {color} |
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|| Subsystem || Report/Notes ||
| JIRA Issue | HDFS-11942 |
| JIRA Patch URL | https://issues.apache.org/jira/secure/attachment/12871780/HDFS-11942.0.patch
|
| Console output | https://builds.apache.org/job/PreCommit-HDFS-Build/19816/console |
| Powered by | Apache Yetus 0.5.0-SNAPSHOT   http://yetus.apache.org |


This message was automatically generated.



> 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
>             Fix For: 2.7.4
>
>         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 sub-task 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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