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https://issues.apache.org/jira/browse/HIVE-23133?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17105369#comment-17105369
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Hive QA commented on HIVE-23133:
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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:blue}0{color} | {color:blue} mvndep {color} | {color:blue} 1m
53s{color} | {color:blue} Maven dependency ordering for branch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 8m
17s{color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 1m
31s{color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green} 1m
9s{color} | {color:green} master passed {color} |
| {color:blue}0{color} | {color:blue} findbugs {color} | {color:blue} 0m
33s{color} | {color:blue} common in master has 63 extant Findbugs warnings.
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| {color:blue}0{color} | {color:blue} findbugs {color} | {color:blue} 3m
45s{color} | {color:blue} ql in master has 1527 extant Findbugs warnings.
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| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 1m
18s{color} | {color:green} master passed {color} |
|| || || || {color:brown} Patch Compile Tests {color} ||
| {color:blue}0{color} | {color:blue} mvndep {color} | {color:blue} 0m
29s{color} | {color:blue} Maven dependency ordering for patch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 1m
55s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 1m
28s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green} 1m
28s{color} | {color:green} the patch passed {color} |
| {color:red}-1{color} | {color:red} checkstyle {color} | {color:red} 0m
39s{color} | {color:red} ql: The patch generated 2 new + 2 unchanged - 0 fixed
= 4 total (was 2) {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
32s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 1m
16s{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.
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| {color:black}{color} | {color:black} {color} | {color:black} 30m 18s{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-22283/dev-support/hive-personality.sh
|
| git revision | master / 8bfdd18 |
| Default Java | 1.8.0_111 |
| findbugs | v3.0.1 |
| checkstyle |
http://104.198.109.242/logs//PreCommit-HIVE-Build-22283/yetus/diff-checkstyle-ql.txt
|
| modules | C: common vector-code-gen ql U: . |
| Console output |
http://104.198.109.242/logs//PreCommit-HIVE-Build-22283/yetus.txt |
| Powered by | Apache Yetus http://yetus.apache.org |
This message was automatically generated.
> Numeric operations can have different result across hardware archs
> ------------------------------------------------------------------
>
> Key: HIVE-23133
> URL: https://issues.apache.org/jira/browse/HIVE-23133
> Project: Hive
> Issue Type: Sub-task
> Reporter: Zhenyu Zheng
> Assignee: Zhenyu Zheng
> Priority: Major
> Attachments: HIVE-23133.1.patch, HIVE-23133.2.patch,
> HIVE-23133.3.patch, HIVE-23133.4.patch, HIVE-23133.5.patch
>
>
> Currently, we have set up an ARM CI to test out how Hive works on ARM
> platform:
> [https://builds.apache.org/view/H-L/view/Hive/job/Hive-linux-ARM-trunk/]
> Among the failures, we have observed that some numeric operations can have
> different result across hardware archs, such as:
> [https://builds.apache.org/view/H-L/view/Hive/job/Hive-linux-ARM-trunk/25/testReport/org.apache.hadoop.hive.cli/TestCliDriver/testCliDriver_vector_decimal_udf2_/]
> [https://builds.apache.org/view/H-L/view/Hive/job/Hive-linux-ARM-trunk/25/testReport/org.apache.hadoop.hive.cli/TestSparkCliDriver/testCliDriver_subquery_select_/]
> [https://builds.apache.org/view/H-L/view/Hive/job/Hive-linux-ARM-trunk/25/testReport/org.apache.hadoop.hive.cli/TestSparkCliDriver/testCliDriver_vectorized_math_funcs_/]
> we can see that the calculation results of log, exp, cos, toRadians etc is
> slitly different than the .out file results that we are
> comparing(they are tested and wrote on X86 machines), this is because of we
> use [Math
> Library|https://docs.oracle.com/javase/6/docs/api/java/lang/Math.html] for
> these kind of calculations.
> and according to the
> [illustration|https://docs.oracle.com/javase/6/docs/api/java/lang/Math.html]:
> _Unlike some of the numeric methods of class StrictMath, all implementations
> of the equivalent functions of class Math are not_
> _defined to return the bit-for-bit same results. This relaxation permits
> better-performing implementations where strict reproducibility_
> _is not required._
> _By default many of the Math methods simply call the equivalent method in
> StrictMath for their implementation._
> _Code generators are encouraged to use platform-specific native libraries or
> microprocessor instructions, where available,_
> _to provide higher-performance implementations of Math methods._
> so the result will have difference across hardware archs.
> On the other hand, JAVA provided another library
> [StrictMath|https://docs.oracle.com/javase/6/docs/api/java/lang/StrictMath.html]
> that will not have this kind of problem as according to its'
> [reference|https://docs.oracle.com/javase/6/docs/api/java/lang/StrictMath.html]:
> _To help ensure portability of Java programs, the definitions of some of the
> numeric functions in this package require that they produce_
> _the same results as certain published algorithms._
> So in order to fix the above mentioned problem, we have to consider switch to
> use StrictMath instead of Math.
>
>
>
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