You are viewing a plain text version of this content. The canonical link for it is here.
Posted to issues@hive.apache.org by "Hive QA (JIRA)" <ji...@apache.org> on 2018/09/23 09:46:00 UTC
[jira] [Commented] (HIVE-20523) Improve table statistics for
Parquet format
[ https://issues.apache.org/jira/browse/HIVE-20523?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16625048#comment-16625048 ]
Hive QA commented on HIVE-20523:
--------------------------------
| (x) *{color:red}-1 overall{color}* |
\\
\\
|| 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} 7m 54s{color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 1m 2s{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} 3m 53s{color} | {color:blue} ql in master has 2326 extant Findbugs warnings. {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 0m 56s{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:red}-1{color} | {color:red} checkstyle {color} | {color:red} 0m 36s{color} | {color:red} ql: The patch generated 51 new + 6 unchanged - 0 fixed = 57 total (was 6) {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} 3m 59s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 0m 57s{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} 23m 14s{color} | {color:black} {color} |
\\
\\
|| 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-13997/dev-support/hive-personality.sh |
| git revision | master / c44f2b5 |
| Default Java | 1.8.0_111 |
| findbugs | v3.0.0 |
| checkstyle | http://104.198.109.242/logs//PreCommit-HIVE-Build-13997/yetus/diff-checkstyle-ql.txt |
| modules | C: ql U: ql |
| Console output | http://104.198.109.242/logs//PreCommit-HIVE-Build-13997/yetus.txt |
| Powered by | Apache Yetus http://yetus.apache.org |
This message was automatically generated.
> Improve table statistics for Parquet format
> -------------------------------------------
>
> Key: HIVE-20523
> URL: https://issues.apache.org/jira/browse/HIVE-20523
> Project: Hive
> Issue Type: Improvement
> Components: Physical Optimizer
> Reporter: George Pachitariu
> Assignee: George Pachitariu
> Priority: Minor
> Attachments: HIVE-20523.1.patch, HIVE-20523.patch
>
>
> Right now, in the table basic statistics, the *raw data size* for a row with any data type in the Parquet format is 1. This is an underestimated value when columns are complex data structures, like arrays.
> Having tables with underestimated raw data size makes Hive assign less containers (mappers/reducers) to it, making the overall query slower.
> Heavy underestimation also makes Hive choose MapJoin instead of the ShuffleJoin that can fail with OOM errors.
> In this patch, I compute the columns data size better, taking into account complex structures. I followed the Writer implementation for the ORC format.
--
This message was sent by Atlassian JIRA
(v7.6.3#76005)