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https://issues.apache.org/jira/browse/HIVE-23052?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17063087#comment-17063087
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Hive QA commented on HIVE-23052:
--------------------------------
Here are the results of testing the latest attachment:
https://issues.apache.org/jira/secure/attachment/12997132/HIVE-23052.1.patch
{color:red}ERROR:{color} -1 due to no test(s) being added or modified.
{color:green}SUCCESS:{color} +1 due to 18123 tests passed
Test results:
https://builds.apache.org/job/PreCommit-HIVE-Build/21187/testReport
Console output: https://builds.apache.org/job/PreCommit-HIVE-Build/21187/console
Test logs: http://104.198.109.242/logs/PreCommit-HIVE-Build-21187/
Messages:
{noformat}
Executing org.apache.hive.ptest.execution.TestCheckPhase
Executing org.apache.hive.ptest.execution.PrepPhase
Executing org.apache.hive.ptest.execution.YetusPhase
Executing org.apache.hive.ptest.execution.ExecutionPhase
Executing org.apache.hive.ptest.execution.ReportingPhase
{noformat}
This message is automatically generated.
ATTACHMENT ID: 12997132 - PreCommit-HIVE-Build
> Optimize lock enqueueing in TxnHandler
> --------------------------------------
>
> Key: HIVE-23052
> URL: https://issues.apache.org/jira/browse/HIVE-23052
> Project: Hive
> Issue Type: Improvement
> Reporter: Marton Bod
> Assignee: Marton Bod
> Priority: Major
> Attachments: HIVE-23052.1.patch
>
>
> TxnHandler::enqueueLockWithRetry uses select for update (S4U) to retrieve the
> next lock id from the metastore. This locks the NEXT_LOCK_ID table for
> concurrent lock requests until the transaction has been committed.
> Since this creates contention, we should reduce the scope of this S4U,
> thereby locking the table for only as long as necessary. Currently, within
> the same txn, after the initial S4U, we also insert the transaction
> components (TXN_COMPONENTS table) before committing, even though they are
> independent and do not make use of the lock id. So moving these txn_component
> inserts before the S4U would decrease the time the next_lock_id table is
> locked and thus increase concurrency.
>
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