[ 
https://issues.apache.org/jira/browse/HIVE-23446?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17105532#comment-17105532
 ] 

Hive QA commented on HIVE-23446:
--------------------------------

| (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:green}+1{color} | {color:green} mvninstall {color} | {color:green} 10m 
 2s{color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  0m 
24s{color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  0m 
15s{color} | {color:green} master passed {color} |
| {color:blue}0{color} | {color:blue} findbugs {color} | {color:blue}  0m 
42s{color} | {color:blue} llap-server in master has 87 extant Findbugs 
warnings. {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  0m 
15s{color} | {color:green} master passed {color} |
|| || || || {color:brown} Patch Compile Tests {color} ||
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green}  0m 
25s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  0m 
24s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green}  0m 
24s{color} | {color:green} the patch passed {color} |
| {color:red}-1{color} | {color:red} checkstyle {color} | {color:red}  0m 
14s{color} | {color:red} llap-server: The patch generated 7 new + 54 unchanged 
- 3 fixed = 61 total (was 57) {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}  0m 
51s{color} | {color:red} llap-server generated 3 new + 85 unchanged - 2 fixed = 
88 total (was 87) {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  0m 
16s{color} | {color:green} the patch passed {color} |
|| || || || {color:brown} Other Tests {color} ||
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green}  0m 
14s{color} | {color:green} The patch does not generate ASF License warnings. 
{color} |
| {color:black}{color} | {color:black} {color} | {color:black} 14m 27s{color} | 
{color:black} {color} |
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|| Reason || Tests ||
| FindBugs | module:llap-server |
|  |  Exceptional return value of 
java.util.concurrent.BlockingQueue.offer(Object) ignored in 
org.apache.hadoop.hive.llap.daemon.impl.ContainerRunnerImpl$UgiPool.getUmbilicalUgi(String,
 Token)  At ContainerRunnerImpl.java:ignored in 
org.apache.hadoop.hive.llap.daemon.impl.ContainerRunnerImpl$UgiPool.getUmbilicalUgi(String,
 Token)  At ContainerRunnerImpl.java:[line 649] |
|  |  Exceptional return value of 
java.util.concurrent.BlockingQueue.offer(Object) ignored in 
org.apache.hadoop.hive.llap.daemon.impl.ContainerRunnerImpl$UgiPool.returnUmbilicalUgi(String,
 UserGroupInformation)  At ContainerRunnerImpl.java:ignored in 
org.apache.hadoop.hive.llap.daemon.impl.ContainerRunnerImpl$UgiPool.returnUmbilicalUgi(String,
 UserGroupInformation)  At ContainerRunnerImpl.java:[line 664] |
|  |  new org.apache.hadoop.hive.llap.daemon.impl.QueryInfo(QueryIdentifier, 
String, String, String, String, int, String, ConcurrentMap, String[], 
FileSystem, String, String, LlapNodeId, String, Token, boolean, 
ContainerRunnerImpl$UgiPool) may expose internal representation by storing an 
externally mutable object into QueryInfo.localDirsBase  At 
QueryInfo.java:String, int, String, ConcurrentMap, String[], FileSystem, 
String, String, LlapNodeId, String, Token, boolean, 
ContainerRunnerImpl$UgiPool) may expose internal representation by storing an 
externally mutable object into QueryInfo.localDirsBase  At QueryInfo.java:[line 
91] |
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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-22287/dev-support/hive-personality.sh
 |
| git revision | master / 57c1593 |
| Default Java | 1.8.0_111 |
| findbugs | v3.0.1 |
| checkstyle | 
http://104.198.109.242/logs//PreCommit-HIVE-Build-22287/yetus/diff-checkstyle-llap-server.txt
 |
| findbugs | 
http://104.198.109.242/logs//PreCommit-HIVE-Build-22287/yetus/new-findbugs-llap-server.html
 |
| modules | C: llap-server U: llap-server |
| Console output | 
http://104.198.109.242/logs//PreCommit-HIVE-Build-22287/yetus.txt |
| Powered by | Apache Yetus    http://yetus.apache.org |


This message was automatically generated.



> LLAP: Reduce IPC connection misses to AM for short queries
> ----------------------------------------------------------
>
>                 Key: HIVE-23446
>                 URL: https://issues.apache.org/jira/browse/HIVE-23446
>             Project: Hive
>          Issue Type: Improvement
>            Reporter: Rajesh Balamohan
>            Assignee: Rajesh Balamohan
>            Priority: Major
>         Attachments: HIVE-23446.1.patch
>
>
> [https://github.com/apache/hive/blob/master/llap-server/src/java/org/apache/hadoop/hive/llap/daemon/impl/QueryInfo.java#L343]
>  
> Umbilical UGI pool for is maintained at QueryInfo level. When there are lots 
> of short queries, this ends up missing IPC cache and ends up recreating 
> threads/connections to the same AM.
> It would be good to maintain this pool in {{ContainerRunnerImpl}} instead and 
> recycle as needed.
>  



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