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Date: Sat, 26 Sep 2015 03:44:20 +0000 (UTC)
From: =?utf-8?Q?=E9=83=AD=E5=90=8C_=28JIRA=29?= <jira@apache.org>
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Message-ID: <JIRA.12532186.1321900071000.80348.1443239060644@Atlassian.JIRA>
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 <JIRA.12532186.1321900071373@arcas>
Subject: [jira] [Commented] (HDFS-2576) Namenode should have a favored nodes
 hint to enable clients to have control over block placement.
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    [ https://issues.apache.org/jira/browse/HDFS-2576?page=3Dcom.atlassian.=
jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=3D14909=
050#comment-14909050 ]=20

=E9=83=AD=E5=90=8C commented on HDFS-2576:
--------------------------

I have the same problem,Thank you very much ...

> Namenode should have a favored nodes hint to enable clients to have contr=
ol over block placement.
> -------------------------------------------------------------------------=
------------------------
>
>                 Key: HDFS-2576
>                 URL: https://issues.apache.org/jira/browse/HDFS-2576
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>          Components: hdfs-client, namenode
>            Reporter: Pritam Damania
>            Assignee: Devaraj Das
>             Fix For: 2.1.0-beta
>
>         Attachments: hdfs-2576-1.txt, hdfs-2576-trunk-1.patch, hdfs-2576-=
trunk-2.patch, hdfs-2576-trunk-7.1.patch, hdfs-2576-trunk-7.patch, hdfs-257=
6-trunk-8.1.patch, hdfs-2576-trunk-8.2.patch, hdfs-2576-trunk-8.3.patch, hd=
fs-2576-trunk-8.patch
>
>
> Sometimes Clients like HBase are required to dynamically compute the data=
nodes it wishes to place the blocks for a file for higher level of locality=
. For this purpose there is a need of a way to give the Namenode a hint in =
terms of a favoredNodes parameter about the locations where the client want=
s to put each block. The proposed solution is a favored nodes parameter in =
the addBlock() method and in the create() file method to enable the clients=
 to give the hints to the NameNode about the locations of each replica of t=
he block. Note that this would be just a hint and finally the NameNode woul=
d look at disk usage, datanode load etc. and decide whether it can respect =
the hints or not.


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