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https://issues.apache.org/jira/browse/HIVE-22906?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17040099#comment-17040099
 ] 

Hive QA commented on HIVE-22906:
--------------------------------

| (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}  9m 
50s{color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  0m 
28s{color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  0m 
22s{color} | {color:green} master passed {color} |
| {color:blue}0{color} | {color:blue} findbugs {color} | {color:blue}  1m 
17s{color} | {color:blue} standalone-metastore/metastore-server in master has 
185 extant Findbugs warnings. {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  0m 
22s{color} | {color:green} master passed {color} |
|| || || || {color:brown} Patch Compile Tests {color} ||
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green}  0m 
32s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  0m 
28s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green}  0m 
28s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  0m 
22s{color} | {color:green} standalone-metastore/metastore-server: The patch 
generated 0 new + 584 unchanged - 1 fixed = 584 total (was 585) {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}  1m 
24s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  0m 
21s{color} | {color:green} the patch passed {color} |
|| || || || {color:brown} Other Tests {color} ||
| {color:red}-1{color} | {color:red} asflicense {color} | {color:red}  0m 
15s{color} | {color:red} The patch generated 1 ASF License warnings. {color} |
| {color:black}{color} | {color:black} {color} | {color:black} 16m 11s{color} | 
{color:black} {color} |
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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-20730/dev-support/hive-personality.sh
 |
| git revision | master / 4700e21 |
| Default Java | 1.8.0_111 |
| findbugs | v3.0.0 |
| asflicense | 
http://104.198.109.242/logs//PreCommit-HIVE-Build-20730/yetus/patch-asflicense-problems.txt
 |
| modules | C: standalone-metastore/metastore-server U: 
standalone-metastore/metastore-server |
| Console output | 
http://104.198.109.242/logs//PreCommit-HIVE-Build-20730/yetus.txt |
| Powered by | Apache Yetus    http://yetus.apache.org |


This message was automatically generated.



> Redundant checkLock Mutex blocks concurrent Lock requests
> ---------------------------------------------------------
>
>                 Key: HIVE-22906
>                 URL: https://issues.apache.org/jira/browse/HIVE-22906
>             Project: Hive
>          Issue Type: Improvement
>          Components: Locking
>            Reporter: Denys Kuzmenko
>            Assignee: Denys Kuzmenko
>            Priority: Major
>         Attachments: HIVE-22906.1.patch
>
>
> enqueueLocks is already serialising locks creation via (SELECT NL_NEXT FROM 
> NEXT_LOCK_ID FOR UPDATE). Requested locks would be assigned 'W' state.
> checkLock is iterating over the sorted set of conflicting locks below current 
> EXT_LOCK_ID. It does handle the situation when there is conflicting lock with 
> lower ID in 'W' state - lock request would be denied and retried later.   



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