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https://issues.apache.org/jira/browse/HDFS-14313?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16872123#comment-16872123
 ] 

Hadoop QA commented on HDFS-14313:
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| (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 
29s{color} | {color:blue} Docker mode activated. {color} |
|| || || || {color:brown} Prechecks {color} ||
| {color:green}+1{color} | {color:green} dupname {color} | {color:green}  0m  
1s{color} | {color:green} No case conflicting files found. {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 3 new or modified test 
files. {color} |
|| || || || {color:brown} trunk Compile Tests {color} ||
| {color:blue}0{color} | {color:blue} mvndep {color} | {color:blue}  1m  
4s{color} | {color:blue} Maven dependency ordering for branch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 17m 
 5s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 17m 
29s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  2m 
22s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  2m 
36s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} shadedclient {color} | {color:green} 
16m 55s{color} | {color:green} branch has no errors when building and testing 
our client artifacts. {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  2m 
11s{color} | {color:green} trunk passed {color} |
| {color:blue}0{color} | {color:blue} spotbugs {color} | {color:blue}  2m 
50s{color} | {color:blue} Used deprecated FindBugs config; considering 
switching to SpotBugs. {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green}  4m 
46s{color} | {color:green} trunk passed {color} |
|| || || || {color:brown} Patch Compile Tests {color} ||
| {color:blue}0{color} | {color:blue} mvndep {color} | {color:blue}  0m 
25s{color} | {color:blue} Maven dependency ordering for patch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green}  1m 
47s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 16m 
39s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green} 16m 
39s{color} | {color:green} the patch passed {color} |
| {color:orange}-0{color} | {color:orange} checkstyle {color} | {color:orange}  
2m 28s{color} | {color:orange} root: The patch generated 10 new + 245 unchanged 
- 1 fixed = 255 total (was 246) {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  2m 
34s{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} 
11m 31s{color} | {color:green} patch has no errors when building and testing 
our client artifacts. {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  2m  
9s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green}  5m 
12s{color} | {color:green} the patch passed {color} |
|| || || || {color:brown} Other Tests {color} ||
| {color:green}+1{color} | {color:green} unit {color} | {color:green}  8m 
46s{color} | {color:green} hadoop-common in the patch passed. {color} |
| {color:red}-1{color} | {color:red} unit {color} | {color:red} 85m 27s{color} 
| {color:red} hadoop-hdfs in the patch failed. {color} |
| {color:red}-1{color} | {color:red} asflicense {color} | {color:red}  1m  
0s{color} | {color:red} The patch generated 1 ASF License warnings. {color} |
| {color:black}{color} | {color:black} {color} | {color:black}202m 33s{color} | 
{color:black} {color} |
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|| Reason || Tests ||
| Failed junit tests | hadoop.hdfs.TestDatanodeDeath |
|   | hadoop.hdfs.TestErasureCodingExerciseAPIs |
|   | hadoop.hdfs.server.namenode.ha.TestHAMetrics |
|   | hadoop.hdfs.TestReconstructStripedFileWithRandomECPolicy |
|   | hadoop.hdfs.server.diskbalancer.TestDiskBalancer |
|   | hadoop.hdfs.TestDFSStorageStateRecovery |
|   | hadoop.hdfs.web.TestWebHdfsTimeouts |
|   | hadoop.hdfs.server.datanode.TestDirectoryScanner |
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|| Subsystem || Report/Notes ||
| Docker | Client=17.05.0-ce Server=17.05.0-ce base: 
https://builds.apache.org/job/hadoop-multibranch/job/PR-1011/1/artifact/out/Dockerfile
 |
| GITHUB PR | https://github.com/apache/hadoop/pull/1011 |
| JIRA Issue | HDFS-14313 |
| Optional Tests | dupname asflicense compile javac javadoc mvninstall mvnsite 
unit shadedclient findbugs checkstyle |
| uname | Linux 56e0f41b2ace 4.4.0-138-generic #164-Ubuntu SMP Tue Oct 2 
17:16:02 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | personality/hadoop.sh |
| git revision | trunk / 041e7a7 |
| Default Java | 1.8.0_212 |
| checkstyle | 
https://builds.apache.org/job/hadoop-multibranch/job/PR-1011/1/artifact/out/diff-checkstyle-root.txt
 |
| unit | 
https://builds.apache.org/job/hadoop-multibranch/job/PR-1011/1/artifact/out/patch-unit-hadoop-hdfs-project_hadoop-hdfs.txt
 |
|  Test Results | 
https://builds.apache.org/job/hadoop-multibranch/job/PR-1011/1/testReport/ |
| asflicense | 
https://builds.apache.org/job/hadoop-multibranch/job/PR-1011/1/artifact/out/patch-asflicense-problems.txt
 |
| Max. process+thread count | 4696 (vs. ulimit of 5500) |
| modules | C: hadoop-common-project/hadoop-common 
hadoop-hdfs-project/hadoop-hdfs U: . |
| Console output | 
https://builds.apache.org/job/hadoop-multibranch/job/PR-1011/1/console |
| versions | git=2.7.4 maven=3.3.9 findbugs=3.1.0-RC1 |
| Powered by | Apache Yetus 0.10.0 http://yetus.apache.org |


This message was automatically generated.



> Get hdfs used space from FsDatasetImpl#volumeMap#ReplicaInfo in memory  
> instead of df/du
> ----------------------------------------------------------------------------------------
>
>                 Key: HDFS-14313
>                 URL: https://issues.apache.org/jira/browse/HDFS-14313
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: datanode, performance
>    Affects Versions: 2.6.0, 2.7.0, 2.8.0, 2.9.0, 3.0.0, 3.1.0
>            Reporter: Lisheng Sun
>            Assignee: Lisheng Sun
>            Priority: Major
>         Attachments: HDFS-14313.000.patch, HDFS-14313.001.patch, 
> HDFS-14313.002.patch, HDFS-14313.003.patch
>
>
> There are two ways of DU/DF getting used space that are insufficient.
>  #  Running DU across lots of disks is very expensive and running all of the 
> processes at the same time creates a noticeable IO spike.
>  #  Running DF is inaccurate when the disk sharing by multiple datanode or 
> other servers.
>  Getting hdfs used space from  FsDatasetImpl#volumeMap#ReplicaInfos in memory 
> is very small and accurate. 



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