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https://issues.apache.org/jira/browse/TEZ-4075?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16945612#comment-16945612
 ] 

TezQA commented on TEZ-4075:
----------------------------

| (/) *{color:green}+1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | {color:blue} reexec {color} | {color:blue} 14m 
56s{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 3 new or modified test 
files. {color} |
|| || || || {color:brown} master Compile Tests {color} ||
| {color:blue}0{color} | {color:blue} mvndep {color} | {color:blue}  0m 
21s{color} | {color:blue} Maven dependency ordering for branch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green}  3m 
39s{color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  1m 
14s{color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  1m 
13s{color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green}  2m  
1s{color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  1m 
19s{color} | {color:green} master passed {color} |
|| || || || {color:brown} Patch Compile Tests {color} ||
| {color:blue}0{color} | {color:blue} mvndep {color} | {color:blue}  0m 
20s{color} | {color:blue} Maven dependency ordering for patch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green}  1m 
15s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  1m 
14s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} cc {color} | {color:green}  1m 
14s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green}  1m 
14s{color} | {color:green} the patch passed {color} |
| {color:orange}-0{color} | {color:orange} checkstyle {color} | {color:orange}  
0m 28s{color} | {color:orange} tez-runtime-library: The patch generated 6 new + 
174 unchanged - 0 fixed = 180 total (was 174) {color} |
| {color:orange}-0{color} | {color:orange} checkstyle {color} | {color:orange}  
0m 22s{color} | {color:orange} tez-tests: The patch generated 4 new + 54 
unchanged - 0 fixed = 58 total (was 54) {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} findbugs {color} | {color:green}  2m 
22s{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:brown} Other Tests {color} ||
| {color:green}+1{color} | {color:green} unit {color} | {color:green}  1m 
50s{color} | {color:green} tez-api in the patch passed. {color} |
| {color:green}+1{color} | {color:green} unit {color} | {color:green}  4m 
42s{color} | {color:green} tez-runtime-library in the patch passed. {color} |
| {color:green}+1{color} | {color:green} unit {color} | {color:green} 33m 
53s{color} | {color:green} tez-tests in the patch passed. {color} |
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green}  1m 
 0s{color} | {color:green} The patch does not generate ASF License warnings. 
{color} |
| {color:black}{color} | {color:black} {color} | {color:black} 75m 37s{color} | 
{color:black} {color} |
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|| Subsystem || Report/Notes ||
| Docker | Client=19.03.2 Server=19.03.2 Image:yetus/tez:d4a62deee |
| JIRA Issue | TEZ-4075 |
| JIRA Patch URL | 
https://issues.apache.org/jira/secure/attachment/12982334/TEZ-4075.enable-dme.16.patch
 |
| Optional Tests |  dupname  asflicense  javac  javadoc  unit  findbugs  
checkstyle  compile  cc  |
| uname | Linux 65d7b9e3391b 4.15.0-58-generic #64-Ubuntu SMP Tue Aug 6 
11:12:41 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | /testptch/patchprocess/precommit/personality/provided.sh |
| git revision | master / 9f5c1b7 |
| maven | version: Apache Maven 3.3.9 |
| Default Java | 1.8.0_222 |
| findbugs | v3.0.1 |
| checkstyle | 
https://builds.apache.org/job/PreCommit-TEZ-Build/171/artifact/out/diff-checkstyle-tez-runtime-library.txt
 |
| checkstyle | 
https://builds.apache.org/job/PreCommit-TEZ-Build/171/artifact/out/diff-checkstyle-tez-tests.txt
 |
|  Test Results | 
https://builds.apache.org/job/PreCommit-TEZ-Build/171/testReport/ |
| Max. process+thread count | 1299 (vs. ulimit of 5500) |
| modules | C: tez-api tez-runtime-library tez-tests U: . |
| Console output | 
https://builds.apache.org/job/PreCommit-TEZ-Build/171/console |
| Powered by | Apache Yetus 0.8.0   http://yetus.apache.org |


This message was automatically generated.



> Tez: Reimplement tez.runtime.transfer.data-via-events.enabled
> -------------------------------------------------------------
>
>                 Key: TEZ-4075
>                 URL: https://issues.apache.org/jira/browse/TEZ-4075
>             Project: Apache Tez
>          Issue Type: Improvement
>            Reporter: Gopal Vijayaraghavan
>            Assignee: Richard Zhang
>            Priority: Major
>         Attachments: TEZ-4075.10.patch, TEZ-4075.15.patch, TEZ-4075.16.patch, 
> TEZ-4075.enable-dme.16.patch, Tez-4075.5.patch, Tez-4075.8.patch
>
>          Time Spent: 0.5h
>  Remaining Estimate: 0h
>
> This was factored out by TEZ-2196, which does skip buffers for 1-partition 
> data exchanges (therefore goes to disk directly).
> {code}
>     if (shufflePayload.hasData()) {       
> shuffleManager.addKnownInput(shufflePayload.getHost(),
>       DataProto dataProto = shufflePayload.getData();         
> shufflePayload.getPort(), srcAttemptIdentifier, srcIndex);
>       FetchedInput fetchedInput = 
> inputAllocator.allocate(dataProto.getRawLength(),   
>           dataProto.getCompressedLength(), srcAttemptIdentifier);     
>       moveDataToFetchedInput(dataProto, fetchedInput, hostIdentifier);        
>       shuffleManager.addCompletedInputWithData(srcAttemptIdentifier, 
> fetchedInput);   
>     } else {  
>       shuffleManager.addKnownInput(shufflePayload.getHost(),  
>           shufflePayload.getPort(), srcAttemptIdentifier, srcIndex);  
>     } 
> {code}
> got removed in 
> https://github.com/apache/tez/commit/1ba1f927c16a1d7c273b6cd1a8553e5269d1541a
> It would be better to buffer up the 512Byte limit for the event size before 
> writing to disk, since creating a new file always incurs disk traffic, even 
> if the file is eventually being served out of the buffer cache.
> The total overhead of receiving an event, then firing an HTTP call to fetch 
> the data etc adds approx 100-150ms to a query - the data xfer through the 
> event will skip the disk entirely for this & also remove the extra IOPS 
> incurred.
> This channel is not suitable for large-scale event transport, but 
> specifically the workload here deals with 1-row control tables which consume 
> more bandwidth with HTTP headers and hostnames than the 93 byte payload.



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