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https://issues.apache.org/jira/browse/HDFS-1312?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15347444#comment-15347444
 ] 

Hadoop QA commented on HDFS-1312:
---------------------------------

| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | {color:blue} reexec {color} | {color:blue} 12m 
16s{color} | {color:blue} Docker mode activated. {color} |
| {color:blue}0{color} | {color:blue} shelldocs {color} | {color:blue}  0m  
1s{color} | {color:blue} Shelldocs was not available. {color} |
| {color:green}+1{color} | {color:green} @author {color} | {color:green}  0m  
0s{color} | {color:green} The patch does not contain any @author tags. {color} |
| {color:green}+1{color} | {color:green} test4tests {color} | {color:green}  0m 
 0s{color} | {color:green} The patch appears to include 15 new or modified test 
files. {color} |
| {color:blue}0{color} | {color:blue} mvndep {color} | {color:blue}  0m 
42s{color} | {color:blue} Maven dependency ordering for branch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green}  7m 
39s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  1m 
41s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  0m 
50s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  1m 
50s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvneclipse {color} | {color:green}  0m 
30s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green}  3m 
43s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  1m 
30s{color} | {color:green} trunk passed {color} |
| {color:blue}0{color} | {color:blue} mvndep {color} | {color:blue}  0m  
9s{color} | {color:blue} Maven dependency ordering for patch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green}  1m 
39s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  1m 
37s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} cc {color} | {color:green}  1m 
37s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green}  1m 
37s{color} | {color:green} the patch passed {color} |
| {color:orange}-0{color} | {color:orange} checkstyle {color} | {color:orange}  
0m 50s{color} | {color:orange} hadoop-hdfs-project: The patch generated 20 new 
+ 1000 unchanged - 2 fixed = 1020 total (was 1002) {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  1m 
39s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} mvneclipse {color} | {color:green}  0m 
26s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} shellcheck {color} | {color:green}  0m 
14s{color} | {color:green} The patch generated 0 new + 75 unchanged - 1 fixed = 
75 total (was 76) {color} |
| {color:green}+1{color} | {color:green} whitespace {color} | {color:green}  0m 
 0s{color} | {color:green} The patch has no whitespace issues. {color} |
| {color:green}+1{color} | {color:green} xml {color} | {color:green}  0m  
3s{color} | {color:green} The patch has no ill-formed XML file. {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green}  4m  
3s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  1m 
20s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} unit {color} | {color:green}  1m  
4s{color} | {color:green} hadoop-hdfs-client in the patch passed. {color} |
| {color:red}-1{color} | {color:red} unit {color} | {color:red} 61m  0s{color} 
| {color:red} hadoop-hdfs in the patch failed. {color} |
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green}  0m 
20s{color} | {color:green} The patch does not generate ASF License warnings. 
{color} |
| {color:black}{color} | {color:black} {color} | {color:black}107m  0s{color} | 
{color:black} {color} |
\\
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|| Reason || Tests ||
| Failed junit tests | hadoop.hdfs.server.namenode.TestEditLog |
|   | hadoop.hdfs.tools.offlineEditsViewer.TestOfflineEditsViewer |
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|| Subsystem || Report/Notes ||
| Docker |  Image:yetus/hadoop:85209cc |
| JIRA Patch URL | 
https://issues.apache.org/jira/secure/attachment/12812949/HDFS-1312.006.patch |
| JIRA Issue | HDFS-1312 |
| Optional Tests |  asflicense  compile  javac  javadoc  mvninstall  mvnsite  
unit  findbugs  checkstyle  cc  xml  shellcheck  shelldocs  |
| uname | Linux c0410e1298a2 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 |
| Build tool | maven |
| Personality | /testptch/hadoop/patchprocess/precommit/personality/provided.sh 
|
| git revision | trunk / dca298d |
| Default Java | 1.8.0_91 |
| shellcheck | v0.4.4 |
| findbugs | v3.0.0 |
| checkstyle | 
https://builds.apache.org/job/PreCommit-HDFS-Build/15895/artifact/patchprocess/diff-checkstyle-hadoop-hdfs-project.txt
 |
| unit | 
https://builds.apache.org/job/PreCommit-HDFS-Build/15895/artifact/patchprocess/patch-unit-hadoop-hdfs-project_hadoop-hdfs.txt
 |
|  Test Results | 
https://builds.apache.org/job/PreCommit-HDFS-Build/15895/testReport/ |
| modules | C: hadoop-hdfs-project/hadoop-hdfs-client 
hadoop-hdfs-project/hadoop-hdfs U: hadoop-hdfs-project |
| Console output | 
https://builds.apache.org/job/PreCommit-HDFS-Build/15895/console |
| Powered by | Apache Yetus 0.4.0-SNAPSHOT   http://yetus.apache.org |


This message was automatically generated.



> Re-balance disks within a Datanode
> ----------------------------------
>
>                 Key: HDFS-1312
>                 URL: https://issues.apache.org/jira/browse/HDFS-1312
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>          Components: datanode
>            Reporter: Travis Crawford
>            Assignee: Anu Engineer
>         Attachments: Architecture_and_test_update.pdf, 
> Architecture_and_testplan.pdf, HDFS-1312.001.patch, HDFS-1312.002.patch, 
> HDFS-1312.003.patch, HDFS-1312.004.patch, HDFS-1312.005.patch, 
> HDFS-1312.006.patch, disk-balancer-proposal.pdf
>
>
> Filing this issue in response to ``full disk woes`` on hdfs-user.
> Datanodes fill their storage directories unevenly, leading to situations 
> where certain disks are full while others are significantly less used. Users 
> at many different sites have experienced this issue, and HDFS administrators 
> are taking steps like:
> - Manually rebalancing blocks in storage directories
> - Decomissioning nodes & later readding them
> There's a tradeoff between making use of all available spindles, and filling 
> disks at the sameish rate. Possible solutions include:
> - Weighting less-used disks heavier when placing new blocks on the datanode. 
> In write-heavy environments this will still make use of all spindles, 
> equalizing disk use over time.
> - Rebalancing blocks locally. This would help equalize disk use as disks are 
> added/replaced in older cluster nodes.
> Datanodes should actively manage their local disk so operator intervention is 
> not needed.



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