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https://issues.apache.org/jira/browse/HDFS-13978?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16643788#comment-16643788
 ] 

Hadoop QA commented on HDFS-13978:
----------------------------------

| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | {color:blue} reexec {color} | {color:blue}  0m 
31s{color} | {color:blue} Docker mode activated. {color} |
|| || || || {color:brown} Prechecks {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:red}-1{color} | {color:red} test4tests {color} | {color:red}  0m  
0s{color} | {color:red} The patch doesn't appear to include any new or modified 
tests. Please justify why no new tests are needed for this patch. Also please 
list what manual steps were performed to verify this patch. {color} |
|| || || || {color:brown} trunk Compile Tests {color} ||
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 23m 
24s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  0m 
59s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  0m 
51s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  1m  
2s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} shadedclient {color} | {color:green} 
13m 54s{color} | {color:green} branch has no errors when building and testing 
our client artifacts. {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green}  1m 
55s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  0m 
48s{color} | {color:green} trunk passed {color} |
|| || || || {color:brown} Patch Compile Tests {color} ||
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green}  0m 
59s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  0m 
52s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green}  0m 
52s{color} | {color:green} hadoop-hdfs-project_hadoop-hdfs generated 0 new + 
416 unchanged - 1 fixed = 416 total (was 417) {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  0m 
46s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  0m 
57s{color} | {color:green} the patch passed {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} shadedclient {color} | {color:green} 
12m 19s{color} | {color:green} patch has no errors when building and testing 
our client artifacts. {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green}  2m 
12s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  0m 
50s{color} | {color:green} the patch passed {color} |
|| || || || {color:brown} Other Tests {color} ||
| {color:red}-1{color} | {color:red} unit {color} | {color:red} 84m 22s{color} 
| {color:red} hadoop-hdfs in the patch failed. {color} |
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green}  0m 
32s{color} | {color:green} The patch does not generate ASF License warnings. 
{color} |
| {color:black}{color} | {color:black} {color} | {color:black}147m  4s{color} | 
{color:black} {color} |
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|| Reason || Tests ||
| Failed junit tests | 
hadoop.hdfs.server.namenode.TestNameNodeMetadataConsistency |
|   | hadoop.hdfs.server.balancer.TestBalancer |
|   | hadoop.fs.TestHdfsNativeCodeLoader |
|   | hadoop.hdfs.client.impl.TestBlockReaderLocal |
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|| Subsystem || Report/Notes ||
| Docker | Client=17.05.0-ce Server=17.05.0-ce Image:yetus/hadoop:4b8c2b1 |
| JIRA Issue | HDFS-13978 |
| JIRA Patch URL | 
https://issues.apache.org/jira/secure/attachment/12943040/HDFS-13978.1.patch |
| Optional Tests |  dupname  asflicense  compile  javac  javadoc  mvninstall  
mvnsite  unit  shadedclient  findbugs  checkstyle  |
| uname | Linux 1d940bcd4e00 3.13.0-153-generic #203-Ubuntu SMP Thu Jun 14 
08:52:28 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | /testptch/patchprocess/precommit/personality/provided.sh |
| git revision | trunk / 9e9915d |
| maven | version: Apache Maven 3.3.9 |
| Default Java | 1.8.0_181 |
| findbugs | v3.1.0-RC1 |
| unit | 
https://builds.apache.org/job/PreCommit-HDFS-Build/25238/artifact/out/patch-unit-hadoop-hdfs-project_hadoop-hdfs.txt
 |
|  Test Results | 
https://builds.apache.org/job/PreCommit-HDFS-Build/25238/testReport/ |
| Max. process+thread count | 3059 (vs. ulimit of 10000) |
| modules | C: hadoop-hdfs-project/hadoop-hdfs U: 
hadoop-hdfs-project/hadoop-hdfs |
| Console output | 
https://builds.apache.org/job/PreCommit-HDFS-Build/25238/console |
| Powered by | Apache Yetus 0.8.0   http://yetus.apache.org |


This message was automatically generated.



> Review of DiskBalancer
> ----------------------
>
>                 Key: HDFS-13978
>                 URL: https://issues.apache.org/jira/browse/HDFS-13978
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: datanode, hdfs
>    Affects Versions: 3.2.0
>            Reporter: BELUGA BEHR
>            Assignee: BELUGA BEHR
>            Priority: Minor
>         Attachments: HDFS-13978.1.patch
>
>
> * Use ArrayList instead of LinkedList. Especially because this code here uses 
> the {{List#get()}} method, which is very slow for the LinkedList since it has 
> to traverse every node to get to the offset: O(N^2)
> {code}
>     ExtendedBlock getNextBlock(List<FsVolumeSpi.BlockIterator> poolIters,
>                                DiskBalancerWorkItem item) {
>       Preconditions.checkNotNull(poolIters);
>       int currentCount = 0;
>       ExtendedBlock block = null;
>       while (block == null && currentCount < poolIters.size()) {
>         currentCount++;
>         int index = poolIndex++ % poolIters.size();
>         FsVolumeSpi.BlockIterator currentPoolIter = poolIters.get(index);
>         block = getBlockToCopy(currentPoolIter, item);
>       }
> {code}
> * Do not "log and throw" errors.  This is an anti-pattern and should be 
> avoided. Log or throw, but don't do both.  Removed some logging
> * Improved other logging statements
> * Improved the {{hashcode}} method of one of the inner classes.  It was 
> instantiating a List and performing iteration for every call.  Replace with 
> Eclipse-generated hashcode method.
> * Fixed compiler warnings for deprecated code or code that was not 
> parameterized
> * Fix check style issue



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