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https://issues.apache.org/jira/browse/HIVE-27201?focusedWorklogId=858859&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-858859
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ASF GitHub Bot logged work on HIVE-27201:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 25/Apr/23 08:00
Start Date: 25/Apr/23 08:00
Worklog Time Spent: 10m
Work Description: dengzhhu653 commented on code in PR #4180:
URL: https://github.com/apache/hive/pull/4180#discussion_r1176150245
##########
service/src/java/org/apache/hive/service/cli/session/HiveSessionImpl.java:
##########
@@ -432,6 +432,18 @@ private synchronized void releaseBeforeOpLock(boolean
userAccess) {
sessionState.resetThreadName();
}
+ // We have already set the thread-local Hive belonging to the current
session,
+ // if the thread-local Hive has been changed/updated after running the
operation,
+ // the Hive after should belong to the same session, and we should update
the sessionHive.
+ // The thread-local hive would be recreated only when the underlying
+ // HiveMetaStoreClient is incompatible with the newest session conf.
+ Hive localHive = Hive.getThreadLocal();
+ if (localHive != null && localHive != sessionHive) {
+ // The previous sessionHive would be GC'ed finally, or should we force
close it?
+ sessionHive = localHive;
+ sessionHive.setAllowClose(false);
Review Comment:
Not yet, when `localHive != sessionHive` comes true, means that the
thread-local hive is a fresh new instance,
https://github.com/apache/hive/blob/master/ql/src/java/org/apache/hadoop/hive/ql/metadata/Hive.java#L428-L466
TestJdbcDriver2#testResultNextAcidTable can repro the case.
Issue Time Tracking
-------------------
Worklog Id: (was: 858859)
Time Spent: 7h 10m (was: 7h)
> Inconsistency between session Hive and thread-local Hive may cause HS2
> deadlock
> -------------------------------------------------------------------------------
>
> Key: HIVE-27201
> URL: https://issues.apache.org/jira/browse/HIVE-27201
> Project: Hive
> Issue Type: Bug
> Components: HiveServer2
> Reporter: Zhihua Deng
> Assignee: Zhihua Deng
> Priority: Major
> Labels: pull-request-available
> Time Spent: 7h 10m
> Remaining Estimate: 0h
>
> The HiveServer2’s server handler can switch to process the operation from
> other session, in such case, the Hive cached in ThreadLocal is not the same
> as the Hive in SessionState, and can be referenced by another session.
> If the two handlers swap their sessions to process the DatabaseMetaData
> request, and the HiveMetastoreClientFactory obtains the Hive via Hive.get(),
> then there is a chance that the deadlock can happen.
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