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https://issues.apache.org/jira/browse/HIVE-20536?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16620011#comment-16620011
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Hive QA commented on HIVE-20536:
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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} 8m
53s{color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 1m
6s{color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green} 0m
44s{color} | {color:green} master passed {color} |
| {color:blue}0{color} | {color:blue} findbugs {color} | {color:blue} 4m
9s{color} | {color:blue} ql in master has 2326 extant Findbugs warnings.
{color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 1m
0s{color} | {color:green} master passed {color} |
|| || || || {color:brown} Patch Compile Tests {color} ||
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 1m
26s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 1m
5s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green} 1m
5s{color} | {color:green} the patch passed {color} |
| {color:red}-1{color} | {color:red} checkstyle {color} | {color:red} 0m
45s{color} | {color:red} ql: The patch generated 1 new + 640 unchanged - 0
fixed = 641 total (was 640) {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
18s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 1m
1s{color} | {color:green} the patch passed {color} |
|| || || || {color:brown} Other Tests {color} ||
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green} 0m
13s{color} | {color:green} The patch does not generate ASF License warnings.
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| {color:black}{color} | {color:black} {color} | {color:black} 25m 14s{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
3.16.36-1+deb8u1 (2016-09-03) x86_64 GNU/Linux |
| Build tool | maven |
| Personality |
/data/hiveptest/working/yetus_PreCommit-HIVE-Build-13894/dev-support/hive-personality.sh
|
| git revision | master / 9c90776 |
| Default Java | 1.8.0_111 |
| findbugs | v3.0.0 |
| checkstyle |
http://104.198.109.242/logs//PreCommit-HIVE-Build-13894/yetus/diff-checkstyle-ql.txt
|
| modules | C: ql U: ql |
| Console output |
http://104.198.109.242/logs//PreCommit-HIVE-Build-13894/yetus.txt |
| Powered by | Apache Yetus http://yetus.apache.org |
This message was automatically generated.
> Add Surrogate Keys function to Hive
> -----------------------------------
>
> Key: HIVE-20536
> URL: https://issues.apache.org/jira/browse/HIVE-20536
> Project: Hive
> Issue Type: Task
> Components: Hive
> Reporter: Miklos Gergely
> Assignee: Miklos Gergely
> Priority: Major
> Attachments: HIVE-20536.01.patch, HIVE-20536.02.patch,
> HIVE-20536.03.patch, HIVE-20536.04.patch, HIVE-20536.05.patch,
> HIVE-20536.06.patch
>
>
> Surrogate keys is an ability to generate and use unique integers for each row
> in a table. If we have that ability then in conjunction with default clause
> we can get surrogate keys functionality. Consider following ddl:
> create table t1 (a string, b bigint default unique_long());
> We already have default clause wherein you can specify a function to provide
> values. So, what we need is udf which can generate unique longs for each row
> across queries for a table.
> Idea is to use write_id . This is a column in metastore table TXN_COMPONENTS
> whose value is determined at compile time to be used during query execution.
> Each query execution generates a new write_id. So, we can seed udf with this
> value during compilation.
> Then we statically allocate ranges for each task from which it can draw next
> long. So, lets say 64-bit write_id we divy up such that last 24 bits belong
> to original usage of it that is txns. Next 16 bits are used for task_attempts
> and last 24 bits to generate new long for each row. This implies we can allow
> 17M txns, 65K tasks and 17M rows in a task. If you hit any of those limits we
> can fail the query.
> Implementation wise: serialize write_id in initialize() of udf. Then during
> execute() we find out what task_attempt current task is and use it along with
> write_id() to get starting long and give a new value on each invocation of
> execute().
> Here we are assuming write_id can be determined at compile time, which should
> be the case but we need to figure out how to get handle to it.
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