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https://issues.apache.org/jira/browse/HIVE-20977?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16730523#comment-16730523
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Hive QA commented on HIVE-20977:
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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
34s{color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 0m
23s{color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green} 0m
6s{color} | {color:green} master passed {color} |
| {color:blue}0{color} | {color:blue} findbugs {color} | {color:blue} 1m
4s{color} | {color:blue} standalone-metastore/metastore-server in master has
188 extant Findbugs warnings. {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 0m
17s{color} | {color:green} master passed {color} |
|| || || || {color:brown} Patch Compile Tests {color} ||
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 0m
27s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 0m
24s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green} 0m
24s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green} 0m
6s{color} | {color:green} the patch passed {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} 1m
12s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 0m
18s{color} | {color:green} the patch passed {color} |
|| || || || {color:brown} Other Tests {color} ||
| {color:red}-1{color} | {color:red} asflicense {color} | {color:red} 0m
13s{color} | {color:red} The patch generated 1 ASF License warnings. {color} |
| {color:black}{color} | {color:black} {color} | {color:black} 13m 21s{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-15443/dev-support/hive-personality.sh
|
| git revision | master / 926c1e8 |
| Default Java | 1.8.0_111 |
| findbugs | v3.0.0 |
| asflicense |
http://104.198.109.242/logs//PreCommit-HIVE-Build-15443/yetus/patch-asflicense-problems.txt
|
| modules | C: standalone-metastore/metastore-server U:
standalone-metastore/metastore-server |
| Console output |
http://104.198.109.242/logs//PreCommit-HIVE-Build-15443/yetus.txt |
| Powered by | Apache Yetus http://yetus.apache.org |
This message was automatically generated.
> Lazy evaluate the table object in PreReadTableEvent to improve get_partition
> performance
> ----------------------------------------------------------------------------------------
>
> Key: HIVE-20977
> URL: https://issues.apache.org/jira/browse/HIVE-20977
> Project: Hive
> Issue Type: Improvement
> Reporter: Karthik Manamcheri
> Assignee: Karthik Manamcheri
> Priority: Minor
> Attachments: HIVE-20977.1.patch
>
>
> The PreReadTableEvent is generated for non-table operations (such as
> get_partitions), but only if there is an event listener attached. However,
> this is also not necessary if the event listener is not interested in the
> read table event.
> For example, the TransactionalValidationListener's onEvent looks like this
> {code:java}
> @Override
> public void onEvent(PreEventContext context) throws MetaException,
> NoSuchObjectException,
> InvalidOperationException {
> switch (context.getEventType()) {
> case CREATE_TABLE:
> handle((PreCreateTableEvent) context);
> break;
> case ALTER_TABLE:
> handle((PreAlterTableEvent) context);
> break;
> default:
> //no validation required..
> }
> }{code}
>
> Note that for read table events it is a no-op. The problem is that the
> get_table is evaluated when creating the PreReadTableEvent finally to be just
> ignored!
> Look at the code below.. {{getMS().getTable(..)}} is evaluated irrespective
> of if the listener uses it or not.
> {code:java}
> private void fireReadTablePreEvent(String catName, String dbName, String
> tblName)
> throws MetaException, NoSuchObjectException {
> if(preListeners.size() > 0) {
> // do this only if there is a pre event listener registered (avoid
> unnecessary
> // metastore api call)
> Table t = getMS().getTable(catName, dbName, tblName);
> if (t == null) {
> throw new NoSuchObjectException(TableName.getQualified(catName, dbName,
> tblName)
> + " table not found");
> }
> firePreEvent(new PreReadTableEvent(t, this));
> }
> }
> {code}
> This can be improved by using a {{Supplier}} and lazily evaluating the table
> when needed (once when the first time it is called, memorized after that).
> *Motivation*
> Whenever a partition call occurs (get_partition, etc.), we fire the
> PreReadTableEvent. This affects performance since it fetches the table even
> if it is not being used. This change will improve performance on the
> get_partition calls.
>
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