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https://issues.apache.org/jira/browse/HIVE-21975?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16940588#comment-16940588
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Hive QA commented on HIVE-21975:
--------------------------------

| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
|| || || || {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:brown} master Compile Tests {color} ||
| {color:blue}0{color} | {color:blue} mvndep {color} | {color:blue}  1m 
43s{color} | {color:blue} Maven dependency ordering for branch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green}  7m 
22s{color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  3m  
2s{color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  2m 
 0s{color} | {color:green} master passed {color} |
| {color:blue}0{color} | {color:blue} findbugs {color} | {color:blue}  4m  
3s{color} | {color:blue} ql in master has 1566 extant Findbugs warnings. 
{color} |
| {color:blue}0{color} | {color:blue} findbugs {color} | {color:blue}  0m 
41s{color} | {color:blue} service in master has 49 extant Findbugs warnings. 
{color} |
| {color:blue}0{color} | {color:blue} findbugs {color} | {color:blue}  0m 
37s{color} | {color:blue} hcatalog/core in master has 36 extant Findbugs 
warnings. {color} |
| {color:blue}0{color} | {color:blue} findbugs {color} | {color:blue}  0m 
41s{color} | {color:blue} itests/hive-unit in master has 2 extant Findbugs 
warnings. {color} |
| {color:blue}0{color} | {color:blue} findbugs {color} | {color:blue}  0m 
49s{color} | {color:blue} itests/util in master has 53 extant Findbugs 
warnings. {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  2m 
17s{color} | {color:green} master passed {color} |
|| || || || {color:brown} Patch Compile Tests {color} ||
| {color:blue}0{color} | {color:blue} mvndep {color} | {color:blue}  0m 
27s{color} | {color:blue} Maven dependency ordering for patch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green}  3m 
29s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  3m  
4s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green}  3m  
4s{color} | {color:green} the patch passed {color} |
| {color:red}-1{color} | {color:red} checkstyle {color} | {color:red}  0m 
59s{color} | {color:red} ql: The patch generated 160 new + 1551 unchanged - 67 
fixed = 1711 total (was 1618) {color} |
| {color:red}-1{color} | {color:red} checkstyle {color} | {color:red}  0m 
14s{color} | {color:red} service: The patch generated 2 new + 54 unchanged - 1 
fixed = 56 total (was 55) {color} |
| {color:red}-1{color} | {color:red} checkstyle {color} | {color:red}  0m 
14s{color} | {color:red} hcatalog/core: The patch generated 4 new + 43 
unchanged - 0 fixed = 47 total (was 43) {color} |
| {color:red}-1{color} | {color:red} checkstyle {color} | {color:red}  0m 
23s{color} | {color:red} itests/hive-unit: The patch generated 4 new + 586 
unchanged - 1 fixed = 590 total (was 587) {color} |
| {color:red}-1{color} | {color:red} checkstyle {color} | {color:red}  0m 
14s{color} | {color:red} itests/util: The patch generated 4 new + 14 unchanged 
- 0 fixed = 18 total (was 14) {color} |
| {color:green}+1{color} | {color:green} whitespace {color} | {color:green}  0m 
 0s{color} | {color:green} The patch has no whitespace issues. {color} |
| {color:red}-1{color} | {color:red} findbugs {color} | {color:red}  4m 
16s{color} | {color:red} ql generated 2 new + 1566 unchanged - 0 fixed = 1568 
total (was 1566) {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  2m 
16s{color} | {color:green} the patch passed {color} |
|| || || || {color:brown} Other Tests {color} ||
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green}  0m 
15s{color} | {color:green} The patch does not generate ASF License warnings. 
{color} |
| {color:black}{color} | {color:black} {color} | {color:black} 43m 56s{color} | 
{color:black} {color} |
\\
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|| Reason || Tests ||
| FindBugs | module:ql |
|  |  Inconsistent synchronization of 
org.apache.hadoop.hive.ql.QueryDisplay$TaskDisplay.beginTime; locked 57% of 
time  Unsynchronized access at QueryDisplay.java:57% of time  Unsynchronized 
access at QueryDisplay.java:[line 243] |
|  |  Inconsistent synchronization of 
org.apache.hadoop.hive.ql.QueryDisplay$TaskDisplay.endTime; locked 50% of time  
Unsynchronized access at QueryDisplay.java:50% of time  Unsynchronized access 
at QueryDisplay.java:[line 248] |
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|| Subsystem || Report/Notes ||
| Optional Tests |  asflicense  javac  javadoc  findbugs  checkstyle  compile  |
| uname | Linux hiveptest-server-upstream 3.16.0-4-amd64 #1 SMP Debian 
3.16.43-2+deb8u5 (2017-09-19) x86_64 GNU/Linux |
| Build tool | maven |
| Personality | 
/data/hiveptest/working/yetus_PreCommit-HIVE-Build-18783/dev-support/hive-personality.sh
 |
| git revision | master / 52224f4 |
| Default Java | 1.8.0_111 |
| findbugs | v3.0.1 |
| checkstyle | 
http://104.198.109.242/logs//PreCommit-HIVE-Build-18783/yetus/diff-checkstyle-ql.txt
 |
| checkstyle | 
http://104.198.109.242/logs//PreCommit-HIVE-Build-18783/yetus/diff-checkstyle-service.txt
 |
| checkstyle | 
http://104.198.109.242/logs//PreCommit-HIVE-Build-18783/yetus/diff-checkstyle-hcatalog_core.txt
 |
| checkstyle | 
http://104.198.109.242/logs//PreCommit-HIVE-Build-18783/yetus/diff-checkstyle-itests_hive-unit.txt
 |
| checkstyle | 
http://104.198.109.242/logs//PreCommit-HIVE-Build-18783/yetus/diff-checkstyle-itests_util.txt
 |
| findbugs | 
http://104.198.109.242/logs//PreCommit-HIVE-Build-18783/yetus/new-findbugs-ql.html
 |
| modules | C: ql service hcatalog/core itests/hive-unit itests/util U: . |
| Console output | 
http://104.198.109.242/logs//PreCommit-HIVE-Build-18783/yetus.txt |
| Powered by | Apache Yetus    http://yetus.apache.org |


This message was automatically generated.



> Fix incremental compilation
> ---------------------------
>
>                 Key: HIVE-21975
>                 URL: https://issues.apache.org/jira/browse/HIVE-21975
>             Project: Hive
>          Issue Type: Bug
>            Reporter: Zoltan Haindrich
>            Assignee: Steve Carlin
>            Priority: Major
>              Labels: pull-request-available
>         Attachments: HIVE-21975.1.patch, HIVE-21975.2.patch, 
> HIVE-21975.3.patch, HIVE-21975.4.patch, HIVE-21975.4.patch, HIVE-21975.patch
>
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> we have an incremental compilation issue around SA ; mostly because of "? 
> extends Serializable"
> it could be reproduced with:
> {code}
> git clean -dfx
> mvn install -pl ql -am -DskipTests
> touch `find . -name Sema*A*java` `find . -name Task*Factory.java`
> mvn install -pl ql  -DskipTests
> {code}
> error is:
> {code}
> [ERROR] Failed to execute goal 
> org.apache.maven.plugins:maven-compiler-plugin:3.6.1:compile 
> (default-compile) on project hive-exec: Compilation failure: Compilation 
> failure: 
> [ERROR] 
> /mnt/work/hwx/hive/master/ql/src/java/org/apache/hadoop/hive/ql/parse/SemanticAnalyzer.java:[12573,60]
>  incompatible types: java.util.List<org.apache.hadoop.hive.ql.exec.Task<? 
> extends java.io.Serializable>> cannot be converted to 
> java.util.List<org.apache.hadoop.hive.ql.exec.Task<?>>
> [ERROR] 
> /mnt/work/hwx/hive/master/ql/src/java/org/apache/hadoop/hive/ql/parse/SemanticAnalyzer.java:[15187,49]
>  incompatible types: java.util.List<org.apache.hadoop.hive.ql.exec.Task<?>> 
> cannot be converted to java.util.List<org.apache.hadoop.hive.ql.exec.Task<? 
> extends java.io.Serializable>>
> {code}



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