[ 
https://issues.apache.org/jira/browse/HDDS-372?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16809711#comment-16809711
 ] 

Hadoop QA commented on HDDS-372:
--------------------------------

| (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 
37s{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  
9s{color} | {color:blue} Maven dependency ordering for branch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green}  6m 
28s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  2m 
55s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  0m 
48s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  0m  
0s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} shadedclient {color} | {color:green} 
12m 40s{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}  1m 
48s{color} | {color:green} trunk passed {color} |
| {color:blue}0{color} | {color:blue} spotbugs {color} | {color:blue}  3m 
33s{color} | {color:blue} Used deprecated FindBugs config; considering 
switching to SpotBugs. {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green}  6m 
18s{color} | {color:green} trunk passed {color} |
|| || || || {color:brown} Patch Compile Tests {color} ||
| {color:blue}0{color} | {color:blue} mvndep {color} | {color:blue}  0m 
23s{color} | {color:blue} Maven dependency ordering for patch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green}  5m 
55s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  2m 
53s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green}  2m 
53s{color} | {color:green} the patch passed {color} |
| {color:orange}-0{color} | {color:orange} checkstyle {color} | {color:orange}  
0m 26s{color} | {color:orange} hadoop-hdds: The patch generated 4 new + 0 
unchanged - 0 fixed = 4 total (was 0) {color} |
| {color:orange}-0{color} | {color:orange} checkstyle {color} | {color:orange}  
0m 22s{color} | {color:orange} hadoop-ozone: The patch generated 3 new + 0 
unchanged - 0 fixed = 3 total (was 0) {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  0m  
0s{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} xml {color} | {color:green}  0m  
2s{color} | {color:green} The patch has no ill-formed XML file. {color} |
| {color:green}+1{color} | {color:green} shadedclient {color} | {color:green}  
9m 55s{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}  1m 
47s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green}  6m 
37s{color} | {color:green} the patch passed {color} |
|| || || || {color:brown} Other Tests {color} ||
| {color:red}-1{color} | {color:red} unit {color} | {color:red}  2m 32s{color} 
| {color:red} hadoop-hdds in the patch failed. {color} |
| {color:red}-1{color} | {color:red} unit {color} | {color:red} 18m  2s{color} 
| {color:red} hadoop-ozone in the patch failed. {color} |
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green}  0m 
28s{color} | {color:green} The patch does not generate ASF License warnings. 
{color} |
| {color:black}{color} | {color:black} {color} | {color:black} 83m  4s{color} | 
{color:black} {color} |
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|| Reason || Tests ||
| Failed junit tests | hadoop.ozone.container.common.TestDatanodeStateMachine |
|   | hadoop.ozone.TestOzoneConfigurationFields |
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|| Subsystem || Report/Notes ||
| Docker | Client=17.05.0-ce Server=17.05.0-ce base: 
https://builds.apache.org/job/PreCommit-HDDS-Build/2633/artifact/out/Dockerfile 
|
| JIRA Issue | HDDS-372 |
| JIRA Patch URL | 
https://issues.apache.org/jira/secure/attachment/12964831/HDDS-372.004.patch |
| Optional Tests | dupname asflicense compile javac javadoc mvninstall mvnsite 
unit shadedclient findbugs checkstyle xml |
| uname | Linux 5192cf77b2ea 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 | 
/home/jenkins/jenkins-slave/workspace/PreCommit-HDDS-Build/ozone.sh |
| git revision | trunk / eb03f7c |
| maven | version: Apache Maven 3.3.9 |
| Default Java | 1.8.0_191 |
| findbugs | v3.1.0-RC1 |
| checkstyle | 
https://builds.apache.org/job/PreCommit-HDDS-Build/2633/artifact/out/diff-checkstyle-hadoop-hdds.txt
 |
| checkstyle | 
https://builds.apache.org/job/PreCommit-HDDS-Build/2633/artifact/out/diff-checkstyle-hadoop-ozone.txt
 |
| unit | 
https://builds.apache.org/job/PreCommit-HDDS-Build/2633/artifact/out/patch-unit-hadoop-hdds.txt
 |
| unit | 
https://builds.apache.org/job/PreCommit-HDDS-Build/2633/artifact/out/patch-unit-hadoop-ozone.txt
 |
|  Test Results | 
https://builds.apache.org/job/PreCommit-HDDS-Build/2633/testReport/ |
| Max. process+thread count | 5838 (vs. ulimit of 10000) |
| modules | C: hadoop-hdds/client hadoop-hdds/common 
hadoop-hdds/container-service hadoop-ozone/client 
hadoop-ozone/objectstore-service hadoop-ozone/tools U: . |
| Console output | 
https://builds.apache.org/job/PreCommit-HDDS-Build/2633/console |
| Powered by | Apache Yetus 0.10.0-SNAPSHOT http://yetus.apache.org |


This message was automatically generated.



> There are three buffer copies in BlockOutputStream
> --------------------------------------------------
>
>                 Key: HDDS-372
>                 URL: https://issues.apache.org/jira/browse/HDDS-372
>             Project: Hadoop Distributed Data Store
>          Issue Type: Improvement
>          Components: Ozone Client
>            Reporter: Tsz Wo Nicholas Sze
>            Assignee: Shashikant Banerjee
>            Priority: Major
>         Attachments: HDDS-372.001.patch, HDDS-372.002.patch, 
> HDDS-372.003.patch, HDDS-372.004.patch, HDDS-372.20180829.patch
>
>
> Currently, there are three buffer copies in ChunkOutputStream
>  # from byte[] to ByteBuffer, and
>  # from ByteBuffer to ByteString.
>  # from ByteString to ByteBuffer for checskum computation
> We should eliminate the ByteBuffer in the middle.
> For zero copy io, we should support WritableByteChannel instead of 
> OutputStream. It won't be done in this JIRA.



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