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https://issues.apache.org/jira/browse/HIVE-24145?focusedWorklogId=481905&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-481905
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ASF GitHub Bot logged work on HIVE-24145:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 11/Sep/20 05:50
Start Date: 11/Sep/20 05:50
Worklog Time Spent: 10m
Work Description: rbalamohan commented on a change in pull request #1485:
URL: https://github.com/apache/hive/pull/1485#discussion_r486787799
##########
File path:
ql/src/java/org/apache/hadoop/hive/ql/optimizer/SortedDynPartitionOptimizer.java
##########
@@ -284,6 +285,11 @@ public Object process(Node nd, Stack<Node> stack,
NodeProcessorCtx procCtx,
// Create ReduceSink operator
ReduceSinkOperator rsOp = getReduceSinkOp(partitionPositions,
sortPositions, sortOrder, sortNullOrder,
allRSCols, bucketColumns, numBuckets, fsParent,
fsOp.getConf().getWriteType());
+ // we have to make sure not to reorder the child operators as it might
cause weird behavior in the tasks at
+ // the same level. when there is auto stats gather at the same level as
another operation then it might
+ // cause unnecessary preemption. Maintaining the order here to avoid
such preemption and possible errors
Review comment:
Plz add TEZ-3296 as ref if possible.
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Issue Time Tracking
-------------------
Worklog Id: (was: 481905)
Time Spent: 0.5h (was: 20m)
> Fix preemption issues in reducers and file sink operators
> ---------------------------------------------------------
>
> Key: HIVE-24145
> URL: https://issues.apache.org/jira/browse/HIVE-24145
> Project: Hive
> Issue Type: Bug
> Reporter: Ramesh Kumar Thangarajan
> Assignee: Ramesh Kumar Thangarajan
> Priority: Major
> Labels: pull-request-available
> Time Spent: 0.5h
> Remaining Estimate: 0h
>
> There are two issues because of preemption:
> # Reducers are getting reordered as part of optimizations because of which
> more preemption happen
> # Preemption in the middle of writing can cause the file to not close and
> lead to errors when we read the file later
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