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https://issues.apache.org/jira/browse/HIVE-25582?focusedWorklogId=668127&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-668127
]
ASF GitHub Bot logged work on HIVE-25582:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 21/Oct/21 07:17
Start Date: 21/Oct/21 07:17
Worklog Time Spent: 10m
Work Description: dengzhhu653 commented on a change in pull request #2693:
URL: https://github.com/apache/hive/pull/2693#discussion_r733385009
##########
File path: ql/src/java/org/apache/hadoop/hive/ql/exec/LimitOperator.java
##########
@@ -69,8 +69,8 @@ protected void initializeOp(Configuration hconf) throws
HiveException {
this.runtimeCache = ObjectCacheFactory.getCache(getConfiguration(),
queryId, false, true);
// this can happen in HS2 while doing local fetch optimization, where
LimitOperator is used
- if (runtimeCache == null) {
- if (!HiveConf.isLoadHiveServer2Config()) {
+ if (runtimeCache == null || !HiveConf.getVar(hconf,
HiveConf.ConfVars.HIVE_EXECUTION_ENGINE).equals("tez")) {
Review comment:
The fixes tries to use LlapObjectCache instead for non-tez cases, as it
tracks the row counter locally in the cache.
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Issue Time Tracking
-------------------
Worklog Id: (was: 668127)
Time Spent: 1h (was: 50m)
> Empty result when using offset limit with MR
> --------------------------------------------
>
> Key: HIVE-25582
> URL: https://issues.apache.org/jira/browse/HIVE-25582
> Project: Hive
> Issue Type: Bug
> Components: Operators
> Affects Versions: 4.0.0
> Reporter: Zhihua Deng
> Assignee: Zhihua Deng
> Priority: Major
> Labels: pull-request-available
> Time Spent: 1h
> Remaining Estimate: 0h
>
> The _mr.ObjectCache_ caches nothing, every time when the limit [retrieving
> global counter from the
> cache|https://github.com/apache/hive/blob/7b3ecf617a6d46f48a3b6f77e0339fd4ad95a420/ql/src/java/org/apache/hadoop/hive/ql/exec/LimitOperator.java#L150-L161],
> a new AtomicInteger will be returned. This make offset _<=
> currentCountForAllTasksInt_ always be evaluated to false, as _offset > 0_,
> the operator will skip all rows.
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