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https://issues.apache.org/jira/browse/HDFS-14084?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16739829#comment-16739829
 ] 

Hadoop QA commented on HDFS-14084:
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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 
22s{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:green}+1{color} | {color:green} test4tests {color} | {color:green}  0m 
 0s{color} | {color:green} The patch appears to include 1 new or modified test 
files. {color} |
|| || || || {color:brown} trunk Compile Tests {color} ||
| {color:blue}0{color} | {color:blue} mvndep {color} | {color:blue}  0m 
55s{color} | {color:blue} Maven dependency ordering for branch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 19m 
21s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 14m 
30s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  2m 
43s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  2m  
3s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} shadedclient {color} | {color:green} 
15m 46s{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}  3m 
24s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  1m 
38s{color} | {color:green} trunk passed {color} |
|| || || || {color:brown} Patch Compile Tests {color} ||
| {color:blue}0{color} | {color:blue} mvndep {color} | {color:blue}  0m 
18s{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} 13m 
49s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green} 13m 
49s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  2m 
41s{color} | {color:green} root: The patch generated 0 new + 132 unchanged - 2 
fixed = 132 total (was 134) {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  2m  
1s{color} | {color:green} the patch passed {color} |
| {color:red}-1{color} | {color:red} whitespace {color} | {color:red}  0m  
0s{color} | {color:red} The patch has 960 line(s) that end in whitespace. Use 
git apply --whitespace=fix <<patch_file>>. Refer 
https://git-scm.com/docs/git-apply {color} |
| {color:red}-1{color} | {color:red} whitespace {color} | {color:red}  0m 
15s{color} | {color:red} The patch 600 line(s) with tabs. {color} |
| {color:green}+1{color} | {color:green} shadedclient {color} | {color:green} 
10m 45s{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}  3m 
42s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  1m 
38s{color} | {color:green} the patch passed {color} |
|| || || || {color:brown} Other Tests {color} ||
| {color:red}-1{color} | {color:red} unit {color} | {color:red}  7m 27s{color} 
| {color:red} hadoop-common in the patch failed. {color} |
| {color:red}-1{color} | {color:red} unit {color} | {color:red} 31m 58s{color} 
| {color:red} hadoop-hdfs in the patch failed. {color} |
| {color:red}-1{color} | {color:red} asflicense {color} | {color:red}  0m 
46s{color} | {color:red} The patch generated 3 ASF License warnings. {color} |
| {color:black}{color} | {color:black} {color} | {color:black}135m 31s{color} | 
{color:black} {color} |
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|| Reason || Tests ||
| Failed junit tests | hadoop.security.ssl.TestSSLFactory |
|   | hadoop.hdfs.web.TestWebHdfsTimeouts |
|   | hadoop.hdfs.server.blockmanagement.TestBlockTokenWithDFSStriped |
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|| Subsystem || Report/Notes ||
| Docker | Client=17.05.0-ce Server=17.05.0-ce Image:yetus/hadoop:8f97d6f |
| JIRA Issue | HDFS-14084 |
| JIRA Patch URL | 
https://issues.apache.org/jira/secure/attachment/12954476/HDFS-14084.012.patch |
| Optional Tests |  dupname  asflicense  compile  javac  javadoc  mvninstall  
mvnsite  unit  shadedclient  findbugs  checkstyle  |
| uname | Linux 9e2dad07f92c 4.4.0-139-generic #165-Ubuntu SMP Wed Oct 24 
10:58:50 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | /testptch/patchprocess/precommit/personality/provided.sh |
| git revision | trunk / 33c009a4 |
| maven | version: Apache Maven 3.3.9 |
| Default Java | 1.8.0_191 |
| findbugs | v3.1.0-RC1 |
| whitespace | 
https://builds.apache.org/job/PreCommit-HDFS-Build/25959/artifact/out/whitespace-eol.txt
 |
| whitespace | 
https://builds.apache.org/job/PreCommit-HDFS-Build/25959/artifact/out/whitespace-tabs.txt
 |
| unit | 
https://builds.apache.org/job/PreCommit-HDFS-Build/25959/artifact/out/patch-unit-hadoop-common-project_hadoop-common.txt
 |
| unit | 
https://builds.apache.org/job/PreCommit-HDFS-Build/25959/artifact/out/patch-unit-hadoop-hdfs-project_hadoop-hdfs.txt
 |
|  Test Results | 
https://builds.apache.org/job/PreCommit-HDFS-Build/25959/testReport/ |
| asflicense | 
https://builds.apache.org/job/PreCommit-HDFS-Build/25959/artifact/out/patch-asflicense-problems.txt
 |
| Max. process+thread count | 3250 (vs. ulimit of 10000) |
| modules | C: hadoop-common-project/hadoop-common 
hadoop-hdfs-project/hadoop-hdfs U: . |
| Console output | 
https://builds.apache.org/job/PreCommit-HDFS-Build/25959/console |
| Powered by | Apache Yetus 0.8.0   http://yetus.apache.org |


This message was automatically generated.



> Need for more stats in DFSClient
> --------------------------------
>
>                 Key: HDFS-14084
>                 URL: https://issues.apache.org/jira/browse/HDFS-14084
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>    Affects Versions: 3.0.0
>            Reporter: Pranay Singh
>            Assignee: Pranay Singh
>            Priority: Minor
>         Attachments: HDFS-14084.001.patch, HDFS-14084.002.patch, 
> HDFS-14084.003.patch, HDFS-14084.004.patch, HDFS-14084.005.patch, 
> HDFS-14084.006.patch, HDFS-14084.007.patch, HDFS-14084.008.patch, 
> HDFS-14084.009.patch, HDFS-14084.010.patch, HDFS-14084.011.patch, 
> HDFS-14084.012.patch
>
>
> The usage of HDFS has changed from being used as a map-reduce filesystem, now 
> it's becoming more of like a general purpose filesystem. In most of the cases 
> there are issues with the Namenode so we have metrics to know the workload or 
> stress on Namenode.
> However, there is a need to have more statistics collected for different 
> operations/RPCs in DFSClient to know which RPC operations are taking longer 
> time or to know what is the frequency of the operation.These statistics can 
> be exposed to the users of DFS Client and they can periodically log or do 
> some sort of flow control if the response is slow. This will also help to 
> isolate HDFS issue in a mixed environment where on a node say we have Spark, 
> HBase and Impala running together. We can check the throughput of different 
> operation across client and isolate the problem caused because of noisy 
> neighbor or network congestion or shared JVM.
> We have dealt with several problems from the field for which there is no 
> conclusive evidence as to what caused the problem. If we had metrics or stats 
> in DFSClient we would be better equipped to solve such complex problems.
> List of jiras for reference:
> -------------------------
>  HADOOP-15538 HADOOP-15530 ( client side deadlock)



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