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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-8131) Implement a space balanced block placement policy
Date Tue, 19 May 2015 06:06:03 GMT

    [ https://issues.apache.org/jira/browse/HDFS-8131?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14549847#comment-14549847
] 

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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