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https://issues.apache.org/jira/browse/HIVE-22891?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17042469#comment-17042469
 ] 

Hive QA commented on HIVE-22891:
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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:green}+1{color} | {color:green} mvninstall {color} | {color:green}  9m 
52s{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 
42s{color} | {color:green} master passed {color} |
| {color:blue}0{color} | {color:blue} findbugs {color} | {color:blue}  3m 
56s{color} | {color:blue} ql in master has 1530 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 
25s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  1m  
4s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green}  1m  
4s{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 + 22 unchanged - 1 
fixed = 22 total (was 23) {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  
5s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  0m 
55s{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} 25m 22s{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-20783/dev-support/hive-personality.sh
 |
| git revision | master / 6c3ee53 |
| Default Java | 1.8.0_111 |
| findbugs | v3.0.1 |
| asflicense | 
http://104.198.109.242/logs//PreCommit-HIVE-Build-20783/yetus/patch-asflicense-problems.txt
 |
| modules | C: ql U: ql |
| Console output | 
http://104.198.109.242/logs//PreCommit-HIVE-Build-20783/yetus.txt |
| Powered by | Apache Yetus    http://yetus.apache.org |


This message was automatically generated.



> Skip PartitonDesc Extraction In CombineHiveRecord For Non-LLAP Execution Mode
> -----------------------------------------------------------------------------
>
>                 Key: HIVE-22891
>                 URL: https://issues.apache.org/jira/browse/HIVE-22891
>             Project: Hive
>          Issue Type: Task
>            Reporter: Syed Shameerur Rahman
>            Assignee: Syed Shameerur Rahman
>            Priority: Major
>             Fix For: 4.0.0
>
>         Attachments: HIVE-22891.01.patch, HIVE-22891.02.patch, 
> HIVE-22891.03.patch
>
>
> {code:java}
> try {
>       // TODO: refactor this out
>       if (pathToPartInfo == null) {
>         MapWork mrwork;
>         if (HiveConf.getVar(conf, 
> HiveConf.ConfVars.HIVE_EXECUTION_ENGINE).equals("tez")) {
>           mrwork = (MapWork) Utilities.getMergeWork(jobConf);
>           if (mrwork == null) {
>             mrwork = Utilities.getMapWork(jobConf);
>           }
>         } else {
>           mrwork = Utilities.getMapWork(jobConf);
>         }
>         pathToPartInfo = mrwork.getPathToPartitionInfo();
>       }      PartitionDesc part = extractSinglePartSpec(hsplit);
>       inputFormat = HiveInputFormat.wrapForLlap(inputFormat, jobConf, part);
>     } catch (HiveException e) {
>       throw new IOException(e);
>     }
> {code}
> The above piece of code in CombineHiveRecordReader.java was introduced in 
> HIVE-15147. This overwrites inputFormat based on the PartitionDesc which is 
> not required in non-LLAP mode of execution as the method 
> HiveInputFormat.wrapForLlap() simply returns the previously defined 
> inputFormat in case of non-LLAP mode. The method call extractSinglePartSpec() 
> has some serious performance implications. If there are large no. of small 
> files, each call in the method extractSinglePartSpec() takes approx ~ (2 - 3) 
> seconds. Hence the same query which runs in Hive 1.x / Hive 2 is way faster 
> than the query run on latest hive.
> {code:java}
> 2020-02-11 07:15:04,701 INFO [main] 
> org.apache.hadoop.hive.ql.io.orc.ReaderImpl: Reading ORC rows from 
> 2020-02-11 07:15:06,468 WARN [main] 
> org.apache.hadoop.hive.ql.io.CombineHiveRecordReader: Multiple partitions 
> found; not going to pass a part spec to LLAP IO: {{logdate=2020-02-03, 
> hour=01, event=win}} and {{logdate=2020-02-03, hour=02, event=act}}
> 2020-02-11 07:15:06,468 INFO [main] 
> org.apache.hadoop.hive.ql.io.CombineHiveRecordReader: succeeded in getting 
> org.apache.hadoop.mapred.FileSplit{code}



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