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https://issues.apache.org/jira/browse/HIVE-6980?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16487082#comment-16487082
 ] 

Hive QA commented on HIVE-6980:
-------------------------------

| (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}  7m 
20s{color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  0m 
38s{color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  0m 
22s{color} | {color:green} master passed {color} |
| {color:blue}0{color} | {color:blue} findbugs {color} | {color:blue}  2m 
53s{color} | {color:blue} standalone-metastore in master has 216 extant 
Findbugs warnings. {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  1m 
14s{color} | {color:green} master passed {color} |
|| || || || {color:brown} Patch Compile Tests {color} ||
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green}  0m 
49s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  0m 
40s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green}  0m 
40s{color} | {color:green} the patch passed {color} |
| {color:red}-1{color} | {color:red} checkstyle {color} | {color:red}  0m 
22s{color} | {color:red} standalone-metastore: The patch generated 6 new + 675 
unchanged - 5 fixed = 681 total (was 680) {color} |
| {color:green}+1{color} | {color:green} whitespace {color} | {color:green}  0m 
 0s{color} | {color:green} The patch has no whitespace issues. {color} |
| {color:red}-1{color} | {color:red} findbugs {color} | {color:red}  3m  
1s{color} | {color:red} standalone-metastore generated 1 new + 215 unchanged - 
1 fixed = 216 total (was 216) {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  1m  
4s{color} | {color:green} the patch passed {color} |
|| || || || {color:brown} Other Tests {color} ||
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green}  0m 
12s{color} | {color:green} The patch does not generate ASF License warnings. 
{color} |
| {color:black}{color} | {color:black} {color} | {color:black} 19m  6s{color} | 
{color:black} {color} |
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|| Reason || Tests ||
| FindBugs | module:standalone-metastore |
|  |  org.apache.hadoop.hive.metastore.ObjectStore$12.run(List) concatenates 
strings using + in a loop  At ObjectStore.java:in a loop  At 
ObjectStore.java:[line 8163] |
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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-11155/dev-support/hive-personality.sh
 |
| git revision | master / 4f789cc |
| Default Java | 1.8.0_111 |
| findbugs | v3.0.0 |
| checkstyle | 
http://104.198.109.242/logs//PreCommit-HIVE-Build-11155/yetus/diff-checkstyle-standalone-metastore.txt
 |
| findbugs | 
http://104.198.109.242/logs//PreCommit-HIVE-Build-11155/yetus/new-findbugs-standalone-metastore.html
 |
| modules | C: standalone-metastore U: standalone-metastore |
| Console output | 
http://104.198.109.242/logs//PreCommit-HIVE-Build-11155/yetus.txt |
| Powered by | Apache Yetus    http://yetus.apache.org |


This message was automatically generated.



> Drop table by using direct sql
> ------------------------------
>
>                 Key: HIVE-6980
>                 URL: https://issues.apache.org/jira/browse/HIVE-6980
>             Project: Hive
>          Issue Type: Improvement
>          Components: Metastore
>    Affects Versions: 0.12.0
>            Reporter: Selina Zhang
>            Assignee: Peter Vary
>            Priority: Major
>         Attachments: HIVE-6980.2.patch, HIVE-6980.3.patch, HIVE-6980.4.patch, 
> HIVE-6980.5.patch, HIVE-6980.6.patch, HIVE-6980.patch, drop_table_after.png, 
> drop_table_before.png
>
>
> Dropping table which has lots of partitions is slow. Even after applying the 
> patch of HIVE-6265, the drop table still takes hours (100K+ partitions). 
> The fixes come with two parts:
> 1. use directSQL to query the partitions protect mode;
> the current implementation needs to transfer the Partition object to client 
> and check the protect mode for each partition. I'd like to move this part of 
> logic to metastore. The check will be done by direct sql (if direct sql is 
> disabled, execute the same logic in the ObjectStore);
> 2. use directSQL to drop partitions for table;
> there maybe two solutions here:
> 1. add "DELETE CASCADE" in the schema. In this way we only need to delete 
> entries from partitions table use direct sql. May need to change 
> datanucleus.deletionPolicy = DataNucleus. 
> 2. clean up the dependent tables by issue DELETE statement. This also needs 
> to turn on datanucleus.query.sql.allowAll
> Both of above solutions should be able to fix the problem. The DELETE CASCADE 
> has to change schemas and prepare upgrade scripts. The second solutions added 
> maintenance cost if new tables added in the future releases.
> Please advice. 



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