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https://issues.apache.org/jira/browse/HIVE-16972?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16065326#comment-16065326
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Hive QA commented on HIVE-16972:
--------------------------------
Here are the results of testing the latest attachment:
https://issues.apache.org/jira/secure/attachment/12874637/screenshot-1.png
{color:red}ERROR:{color} -1 due to build exiting with an error
Test results: https://builds.apache.org/job/PreCommit-HIVE-Build/5787/testReport
Console output: https://builds.apache.org/job/PreCommit-HIVE-Build/5787/console
Test logs: http://104.198.109.242/logs/PreCommit-HIVE-Build-5787/
Messages:
{noformat}
Executing org.apache.hive.ptest.execution.TestCheckPhase
Executing org.apache.hive.ptest.execution.PrepPhase
Tests exited with: NonZeroExitCodeException
Command 'bash /data/hiveptest/working/scratch/source-prep.sh' failed with exit
status 1 and output '+ date '+%Y-%m-%d %T.%3N'
2017-06-27 19:13:05.607
+ [[ -n /usr/lib/jvm/java-8-openjdk-amd64 ]]
+ export JAVA_HOME=/usr/lib/jvm/java-8-openjdk-amd64
+ JAVA_HOME=/usr/lib/jvm/java-8-openjdk-amd64
+ export
PATH=/usr/lib/jvm/java-8-openjdk-amd64/bin/:/usr/local/bin:/usr/bin:/bin:/usr/local/games:/usr/games
+
PATH=/usr/lib/jvm/java-8-openjdk-amd64/bin/:/usr/local/bin:/usr/bin:/bin:/usr/local/games:/usr/games
+ export 'ANT_OPTS=-Xmx1g -XX:MaxPermSize=256m '
+ ANT_OPTS='-Xmx1g -XX:MaxPermSize=256m '
+ export 'MAVEN_OPTS=-Xmx1g '
+ MAVEN_OPTS='-Xmx1g '
+ cd /data/hiveptest/working/
+ tee /data/hiveptest/logs/PreCommit-HIVE-Build-5787/source-prep.txt
+ [[ false == \t\r\u\e ]]
+ mkdir -p maven ivy
+ [[ git = \s\v\n ]]
+ [[ git = \g\i\t ]]
+ [[ -z master ]]
+ [[ -d apache-github-source-source ]]
+ [[ ! -d apache-github-source-source/.git ]]
+ [[ ! -d apache-github-source-source ]]
+ date '+%Y-%m-%d %T.%3N'
2017-06-27 19:13:05.609
+ cd apache-github-source-source
+ git fetch origin
+ git reset --hard HEAD
HEAD is now at 22494f8 HIVE-16942: INFORMATION_SCHEMA: schematool for setting
it up is not idempotent (Gunther Hagleitner, reviewed by Thejas Nair)
+ git clean -f -d
+ git checkout master
Already on 'master'
Your branch is up-to-date with 'origin/master'.
+ git reset --hard origin/master
HEAD is now at 22494f8 HIVE-16942: INFORMATION_SCHEMA: schematool for setting
it up is not idempotent (Gunther Hagleitner, reviewed by Thejas Nair)
+ git merge --ff-only origin/master
Already up-to-date.
+ date '+%Y-%m-%d %T.%3N'
2017-06-27 19:13:10.706
+ patchCommandPath=/data/hiveptest/working/scratch/smart-apply-patch.sh
+ patchFilePath=/data/hiveptest/working/scratch/build.patch
+ [[ -f /data/hiveptest/working/scratch/build.patch ]]
+ chmod +x /data/hiveptest/working/scratch/smart-apply-patch.sh
+ /data/hiveptest/working/scratch/smart-apply-patch.sh
/data/hiveptest/working/scratch/build.patch
patch: **** Only garbage was found in the patch input.
patch: **** Only garbage was found in the patch input.
patch: **** Only garbage was found in the patch input.
fatal: unrecognized input
The patch does not appear to apply with p0, p1, or p2
+ exit 1
'
{noformat}
This message is automatically generated.
ATTACHMENT ID: 12874637 - PreCommit-HIVE-Build
> FetchOperator: filter out inputSplits which length is zero
> ----------------------------------------------------------
>
> Key: HIVE-16972
> URL: https://issues.apache.org/jira/browse/HIVE-16972
> Project: Hive
> Issue Type: Improvement
> Components: Physical Optimizer
> Affects Versions: 2.1.0, 2.1.1
> Reporter: Chaozhong Yang
> Assignee: Chaozhong Yang
> Fix For: 2.1.2
>
> Attachments: HIVE-16972.patch, screenshot-1.png
>
>
> * Background
> We can describe the basic work flow of common HQL query as follows:
> 1. compile and execute
> 2. fetch results
> In many cases, we don't need to worry about the issues fetching results
> from HDFS(iff there are mapreduce jobs generated in planning step). However,
> the number of results files on HDFS and data distribution will affect the
> final status of HQL query, especially for HiveServer2. We have some map-only
> queries, e.g:
> {code:sql}
> select * from myTable where date > '20170101' and date <= '20170301' and id =
> 88;
> {code}
> This query will generate more than 20,000 files(look at screenshot image
> uploaded) on HDFS and most of those files are empty. Of course, they are very
> sparse. If we send TFetchResultsRequest from HiveServer2 client with some
> parameters(timeout:90s, maxRows:1024) , FetchOperator can not fetch 1024 rows
> in 90 seconds and our HiveServer2 client will mark this TFetchResultsRequest
> as timed out failure. Why? In fact, It's expensive to fetch results from
> empty file. In our HDFS cluster( 5000+ DataNodes) , reading data from an
> empty file will cost almost 100 ms (100ms * 1000 ==> 100s > 90s timeout).
> Obviously, we can filter out those empty files or splits to speed up the
> process of FetchResults.
>
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