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https://issues.apache.org/jira/browse/HIVE-22850?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17037340#comment-17037340
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Hive QA commented on HIVE-22850:
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| (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} 2m
5s{color} | {color:blue} Maven dependency ordering for branch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 8m
20s{color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 1m
37s{color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green} 1m
5s{color} | {color:green} master passed {color} |
| {color:blue}0{color} | {color:blue} findbugs {color} | {color:blue} 1m
16s{color} | {color:blue} standalone-metastore/metastore-server in master has
181 extant Findbugs warnings. {color} |
| {color:blue}0{color} | {color:blue} findbugs {color} | {color:blue} 3m
57s{color} | {color:blue} ql in master has 1532 extant Findbugs warnings.
{color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 1m
18s{color} | {color:green} master passed {color} |
|| || || || {color:brown} Patch Compile Tests {color} ||
| {color:blue}0{color} | {color:blue} mvndep {color} | {color:blue} 0m
28s{color} | {color:blue} Maven dependency ordering for patch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 1m
56s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 1m
31s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green} 1m
31s{color} | {color:green} the patch passed {color} |
| {color:red}-1{color} | {color:red} checkstyle {color} | {color:red} 0m
24s{color} | {color:red} standalone-metastore/metastore-server: The patch
generated 6 new + 573 unchanged - 12 fixed = 579 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} 5m
48s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 1m
19s{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} 32m 54s{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-20628/dev-support/hive-personality.sh
|
| git revision | master / 55207c2 |
| Default Java | 1.8.0_111 |
| findbugs | v3.0.0 |
| checkstyle |
http://104.198.109.242/logs//PreCommit-HIVE-Build-20628/yetus/diff-checkstyle-standalone-metastore_metastore-server.txt
|
| modules | C: standalone-metastore/metastore-server ql U: . |
| Console output |
http://104.198.109.242/logs//PreCommit-HIVE-Build-20628/yetus.txt |
| Powered by | Apache Yetus http://yetus.apache.org |
This message was automatically generated.
> Optimise lock acquisition in TxnHandler
> ---------------------------------------
>
> Key: HIVE-22850
> URL: https://issues.apache.org/jira/browse/HIVE-22850
> Project: Hive
> Issue Type: Improvement
> Components: Hive
> Reporter: Rajesh Balamohan
> Priority: Major
> Attachments: HIVE-22850.1.patch, HIVE-22850.2.patch,
> HIVE-22850.3.patch, HIVE-22850.4.patch, HIVE-22850.6.patch, Screenshot
> 2020-02-07 at 4.14.51 AM.jpg, jumpTableInfo.png
>
>
> With concurrent queries, time taken for lock acquisition increases
> substantially. As part of lock acquisition in the query,
> {{TxnHandler::checkLock}} gets invoked. This involves getting a mutex and
> compare the locks being requested for, with that of existing locks in
> {{HIVE_LOCKS}} table.
> With concurrent queries, time taken to do this check increase and this
> significantly increases the time taken for getting mutex for other threads
> (due to select for update). In a synthetic workload, it was in the order of
> 10+ seconds. This codepath can be optimized when all lock requests are
> SHARED_READ.
>
>
> !Screenshot 2020-02-07 at 4.14.51 AM.jpg|width=743,height=348!
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