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https://issues.apache.org/jira/browse/HIVE-21028?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16719758#comment-16719758
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Hive QA commented on HIVE-21028:
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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
54s{color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 0m
24s{color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green} 0m
7s{color} | {color:green} master passed {color} |
| {color:blue}0{color} | {color:blue} findbugs {color} | {color:blue} 1m
5s{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
26s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 0m
25s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green} 0m
25s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green} 0m
7s{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
6s{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:green}+1{color} | {color:green} asflicense {color} | {color:green} 0m
12s{color} | {color:green} The patch does not generate ASF License warnings.
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| {color:black}{color} | {color:black} {color} | {color:black} 12m 42s{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-15292/dev-support/hive-personality.sh
|
| git revision | master / a43581b |
| Default Java | 1.8.0_111 |
| findbugs | v3.0.0 |
| modules | C: standalone-metastore/metastore-server U:
standalone-metastore/metastore-server |
| Console output |
http://104.198.109.242/logs//PreCommit-HIVE-Build-15292/yetus.txt |
| Powered by | Apache Yetus http://yetus.apache.org |
This message was automatically generated.
> get_table_meta should use a fetch plan to avoid race conditions ending up in
> NucleusObjectNotFoundException
> -----------------------------------------------------------------------------------------------------------
>
> Key: HIVE-21028
> URL: https://issues.apache.org/jira/browse/HIVE-21028
> Project: Hive
> Issue Type: Bug
> Reporter: Karthik Manamcheri
> Assignee: Karthik Manamcheri
> Priority: Major
> Attachments: HIVE-21028.1.patch
>
>
> The {{getTableMeta}} call retrieves the tables, loops through the tables and
> during this loop it retrieves the database object to get the containing
> database name. DataNuclues does a lazy retrieval and so, when the first call
> to get all the tables is done, it does not retrieve the database objects.
> When this query is executed
> {code}query = pm.newQuery(MTable.class, filterBuilder.toString());
> {code}
> it loads all the tables, and when you do
> {code}
> table.getDatabase().getName()
> {code}
> it then goes and retrieves the database object.
> *However*, there could be another thread which actually has deleted the
> database!! If this happens, we end up with exceptions such as
> {code}
> 2018-12-04 22:25:06,525 INFO DataNucleus.Datastore.Retrieve:
> [pool-7-thread-191]: Object with id
> "6930391[OID]org.apache.hadoop.hive.metastore.model.MTable" not found !
> 2018-12-04 22:25:06,527 WARN DataNucleus.Persistence: [pool-7-thread-191]:
> Exception thrown by StateManager.isLoaded
> No such database row
> org.datanucleus.exceptions.NucleusObjectNotFoundException: No such database
> row
> {code}
> We see this happen especially with calls which retrieve all the tables in all
> the databases (basically a call to get_table_meta with dbNames="\*" and
> tableNames="\*").
> To avoid this, we can define a custom fetch plan and activate it only for the
> get_table_meta query. This fetch plan would fetch the database object along
> with the MTable object.
> We would first create a fetch plan on the pmf
> {code}
> pmf.getFetchGroup(MTable.class,
> "mtable_db_fetch_group").addMember("database");
> {code}
> Then we use it just before calling the query
> {code}
> pm.getFetchPlan().addGroup("mtable_db_fetch_group");
> query = pm.newQuery(MTable.class, filterBuilder.toString());
> Collection<MTable> tables = (Collection<MTable>) query.executeWithArray(...);
> ...
> {code}
> Before the API call ends, we can remove the fetch plan by
> {code}
> pm.getFetchPlan().removeGroup("mtable_db_fetch_group");
> {code}
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