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From "Hive QA (Jira)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-21439) Provide an option to reduce lookup overhead for bucketed tables
Date Sat, 29 Feb 2020 13:22:00 GMT

    [ https://issues.apache.org/jira/browse/HIVE-21439?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17048302#comment-17048302
] 

Hive QA commented on HIVE-21439:
--------------------------------

| (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 13s{color}
| {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  1m  4s{color} |
{color:green} master passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  0m 43s{color}
| {color:green} master passed {color} |
| {color:blue}0{color} | {color:blue} findbugs {color} | {color:blue}  4m 10s{color} | {color:blue}
ql in master has 1531 extant Findbugs warnings. {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  0m 58s{color} |
{color:green} master passed {color} |
|| || || || {color:brown} Patch Compile Tests {color} ||
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green}  1m 32s{color}
| {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  1m  9s{color} |
{color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green}  1m  9s{color} | {color:green}
the patch passed {color} |
| {color:red}-1{color} | {color:red} checkstyle {color} | {color:red}  0m 49s{color} | {color:red}
ql: The patch generated 2 new + 12 unchanged - 0 fixed = 14 total (was 12) {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}  4m 16s{color} |
{color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  1m  1s{color} |
{color:green} the patch passed {color} |
|| || || || {color:brown} Other Tests {color} ||
| {color:red}-1{color} | {color:red} asflicense {color} | {color:red}  0m 16s{color} | {color:red}
The patch generated 2 ASF License warnings. {color} |
| {color:black}{color} | {color:black} {color} | {color:black} 26m 44s{color} | {color:black}
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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-20890/dev-support/hive-personality.sh
|
| git revision | master / 2a7344a |
| Default Java | 1.8.0_111 |
| findbugs | v3.0.1 |
| checkstyle | http://104.198.109.242/logs//PreCommit-HIVE-Build-20890/yetus/diff-checkstyle-ql.txt
|
| asflicense | http://104.198.109.242/logs//PreCommit-HIVE-Build-20890/yetus/patch-asflicense-problems.txt
|
| modules | C: ql U: ql |
| Console output | http://104.198.109.242/logs//PreCommit-HIVE-Build-20890/yetus.txt |
| Powered by | Apache Yetus    http://yetus.apache.org |


This message was automatically generated.



> Provide an option to reduce lookup overhead for bucketed tables
> ---------------------------------------------------------------
>
>                 Key: HIVE-21439
>                 URL: https://issues.apache.org/jira/browse/HIVE-21439
>             Project: Hive
>          Issue Type: Bug
>            Reporter: Rajesh Balamohan
>            Assignee: Rajesh Balamohan
>            Priority: Trivial
>         Attachments: HIVE-21439.1.patch, HIVE-21439.2.patch, HIVE-21439.3.patch
>
>
> If a table is bucketed, `OpTraitsRulesProcFactory::TableScanRule` ends up verifying if
the partitions have got the same number of files as the number of buckets in table. https://github.com/apache/hive/blob/master/ql/src/java/org/apache/hadoop/hive/ql/optimizer/metainfo/annotation/OpTraitsRulesProcFactory.java#L185
> In large tables, this turns out to be very time consuming (100s of seconds) operation.
It would be good to have an option to by pass this depending on need basis.



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