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https://issues.apache.org/jira/browse/HDFS-8131?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14543620#comment-14543620
]
Hadoop QA commented on HDFS-8131:
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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | patch | 0m 1s | The patch file was not named
according to hadoop's naming conventions. Please see
https://wiki.apache.org/hadoop/HowToContribute for instructions. |
| {color:blue}0{color} | pre-patch | 14m 34s | 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 29s | There were no new javac warning
messages. |
| {color:red}-1{color} | javadoc | 9m 39s | The applied patch generated 1
additional warning messages. |
| {color:green}+1{color} | release audit | 0m 22s | The applied patch does
not increase the total number of release audit warnings. |
| {color:red}-1{color} | checkstyle | 2m 15s | The applied patch generated
16 new checkstyle issues (total was 459, now 475). |
| {color:red}-1{color} | whitespace | 0m 0s | The patch has 1 line(s) that
end in whitespace. Use git apply --whitespace=fix. |
| {color:green}+1{color} | install | 1m 32s | mvn install still works. |
| {color:green}+1{color} | eclipse:eclipse | 0m 33s | The patch built with
eclipse:eclipse. |
| {color:green}+1{color} | findbugs | 3m 4s | The patch does not introduce
any new Findbugs (version 2.0.3) warnings. |
| {color:green}+1{color} | native | 3m 14s | Pre-build of native portion |
| {color:red}-1{color} | hdfs tests | 168m 5s | Tests failed in hadoop-hdfs. |
| | | 210m 51s | |
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|| Reason || Tests ||
| Failed unit tests | hadoop.tools.TestHdfsConfigFields |
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|| Subsystem || Report/Notes ||
| Patch URL |
http://issues.apache.org/jira/secure/attachment/12732816/HDFS-8131-v3.diff |
| Optional Tests | javadoc javac unit findbugs checkstyle |
| git revision | trunk / 0daa5ad |
| javadoc |
https://builds.apache.org/job/PreCommit-HDFS-Build/10972/artifact/patchprocess/diffJavadocWarnings.txt
|
| checkstyle |
https://builds.apache.org/job/PreCommit-HDFS-Build/10972/artifact/patchprocess/diffcheckstylehadoop-hdfs.txt
|
| whitespace |
https://builds.apache.org/job/PreCommit-HDFS-Build/10972/artifact/patchprocess/whitespace.txt
|
| hadoop-hdfs test log |
https://builds.apache.org/job/PreCommit-HDFS-Build/10972/artifact/patchprocess/testrun_hadoop-hdfs.txt
|
| Test Results |
https://builds.apache.org/job/PreCommit-HDFS-Build/10972/testReport/ |
| Java | 1.7.0_55 |
| uname | Linux asf906.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/10972/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
> Fix For: 3.0.0
>
> Attachments: HDFS-8131-v1.diff, HDFS-8131-v2.diff, HDFS-8131-v3.diff,
> 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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