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https://issues.apache.org/jira/browse/HDFS-8131?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14549847#comment-14549847
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Hadoop QA commented on HDFS-8131:
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| (/) *{color:green}+1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | pre-patch |  15m  8s | Pre-patch trunk compilation is 
healthy. |
| {color:green}+1{color} | @author |   0m  0s | The patch does not contain any 
@author tags. |
| {color:green}+1{color} | tests included |   0m  0s | The patch appears to 
include 1 new or modified test files. |
| {color:green}+1{color} | javac |   7m 41s | There were no new javac warning 
messages. |
| {color:green}+1{color} | javadoc |   9m 56s | There were no new javadoc 
warning messages. |
| {color:green}+1{color} | release audit |   0m 23s | The applied patch does 
not increase the total number of release audit warnings. |
| {color:green}+1{color} | checkstyle |   0m 38s | There were no new checkstyle 
issues. |
| {color:green}+1{color} | whitespace |   0m  0s | The patch has no lines that 
end in whitespace. |
| {color:green}+1{color} | install |   1m 40s | mvn install still works. |
| {color:green}+1{color} | eclipse:eclipse |   0m 33s | The patch built with 
eclipse:eclipse. |
| {color:green}+1{color} | findbugs |   3m 21s | The patch does not introduce 
any new Findbugs (version 3.0.0) warnings. |
| {color:green}+1{color} | native |   3m 18s | Pre-build of native portion |
| {color:green}+1{color} | hdfs tests | 167m 57s | Tests passed in hadoop-hdfs. 
|
| | | 210m 38s | |
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|| Subsystem || Report/Notes ||
| Patch URL | 
http://issues.apache.org/jira/secure/attachment/12733696/HDFS-8131.006.patch |
| Optional Tests | javadoc javac unit findbugs checkstyle |
| git revision | trunk / 0790275 |
| hadoop-hdfs test log | 
https://builds.apache.org/job/PreCommit-HDFS-Build/11042/artifact/patchprocess/testrun_hadoop-hdfs.txt
 |
| Test Results | 
https://builds.apache.org/job/PreCommit-HDFS-Build/11042/testReport/ |
| Java | 1.7.0_55 |
| uname | Linux asf904.gq1.ygridcore.net 3.13.0-36-lowlatency #63-Ubuntu SMP 
PREEMPT Wed Sep 3 21:56:12 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux |
| Console output | 
https://builds.apache.org/job/PreCommit-HDFS-Build/11042/console |


This message was automatically generated.

> Implement a space balanced block placement policy
> -------------------------------------------------
>
>                 Key: HDFS-8131
>                 URL: https://issues.apache.org/jira/browse/HDFS-8131
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: namenode
>    Affects Versions: 3.0.0
>            Reporter: Liu Shaohui
>            Assignee: Liu Shaohui
>            Priority: Minor
>              Labels: BlockPlacementPolicy
>         Attachments: HDFS-8131-v1.diff, HDFS-8131-v2.diff, HDFS-8131-v3.diff, 
> HDFS-8131.004.patch, HDFS-8131.005.patch, HDFS-8131.006.patch, balanced.png
>
>
> The default block placement policy will choose datanodes for new blocks 
> randomly, which will result in unbalanced space used percent among datanodes 
> after an cluster expansion. The old datanodes always are in high used percent 
> of space and new added ones are in low percent.
> Through we can used the external balance tool to balance the space used rate, 
> it will cost extra network IO and it's not easy to control the balance speed.
> An easy solution is to implement an balanced block placement policy which 
> will choose low used percent datanodes for new blocks with a little high 
> possibility. In a not long term, the used percent of datanodes will trend to 
> be balanced.
> Suggestions and discussions are welcomed. Thanks



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