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From "Hive QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-19824) Improve online datasize estimations for MapJoins
Date Wed, 13 Jun 2018 07:42:00 GMT

    [ https://issues.apache.org/jira/browse/HIVE-19824?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16510733#comment-16510733
] 

Hive QA commented on HIVE-19824:
--------------------------------

| (/) *{color:green}+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}  8m  8s{color}
| {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  1m  7s{color} |
{color:green} master passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  0m 41s{color}
| {color:green} master passed {color} |
| {color:blue}0{color} | {color:blue} findbugs {color} | {color:blue}  4m  7s{color} | {color:blue}
ql in master has 2279 extant Findbugs warnings. {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  0m 57s{color} |
{color:green} master passed {color} |
|| || || || {color:brown} Patch Compile Tests {color} ||
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green}  1m 23s{color}
| {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  1m  3s{color} |
{color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green}  1m  3s{color} | {color:green}
the patch passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  0m 39s{color}
| {color:green} ql: The patch generated 0 new + 27 unchanged - 1 fixed = 27 total (was 28)
{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  6s{color} |
{color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  0m 56s{color} |
{color:green} the patch passed {color} |
|| || || || {color:brown} Other Tests {color} ||
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green}  0m 12s{color}
| {color:green} The patch does not generate ASF License warnings. {color} |
| {color:black}{color} | {color:black} {color} | {color:black} 23m 53s{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 3.16.36-1+deb8u1 (2016-09-03)
x86_64 GNU/Linux |
| Build tool | maven |
| Personality | /data/hiveptest/working/yetus_PreCommit-HIVE-Build-11750/dev-support/hive-personality.sh
|
| git revision | master / 9468d1f |
| Default Java | 1.8.0_111 |
| findbugs | v3.0.0 |
| modules | C: ql U: ql |
| Console output | http://104.198.109.242/logs//PreCommit-HIVE-Build-11750/yetus.txt |
| Powered by | Apache Yetus    http://yetus.apache.org |


This message was automatically generated.



> Improve online datasize estimations for MapJoins
> ------------------------------------------------
>
>                 Key: HIVE-19824
>                 URL: https://issues.apache.org/jira/browse/HIVE-19824
>             Project: Hive
>          Issue Type: Improvement
>            Reporter: Zoltan Haindrich
>            Assignee: Zoltan Haindrich
>            Priority: Major
>         Attachments: HIVE-19824.01.patch, HIVE-19824.01wip01.patch, HIVE-19824.01wip01.patch,
HIVE-19824.02.patch
>
>
> Statistics.datasize() only accounts for "real" data size; but for example handling 1M
rows might introduce some datastructure overhead...if the "real" data is small - even this
overhead might become the real memory usage
> for 6.5M rows of (int,int) the estimation is 52MB
> in reality this eats up ~260MB from which 210MB is used to service the hashmap functionality
to that many rows.



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