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Posted to issues@hive.apache.org by "ASF GitHub Bot (Jira)" <ji...@apache.org> on 2021/11/24 00:12:00 UTC
[jira] [Work logged] (HIVE-22294) ConditionalWork cannot be cast to MapredWork When both skew.join and auto.convert is on.
[ https://issues.apache.org/jira/browse/HIVE-22294?focusedWorklogId=685546&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-685546 ]
ASF GitHub Bot logged work on HIVE-22294:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 24/Nov/21 00:11
Start Date: 24/Nov/21 00:11
Worklog Time Spent: 10m
Work Description: github-actions[bot] commented on pull request #2673:
URL: https://github.com/apache/hive/pull/2673#issuecomment-977307194
This pull request has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs.
Feel free to reach out on the dev@hive.apache.org list if the patch is in need of reviews.
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Issue Time Tracking
-------------------
Worklog Id: (was: 685546)
Time Spent: 0.5h (was: 20m)
> ConditionalWork cannot be cast to MapredWork When both skew.join and auto.convert is on.
> -------------------------------------------------------------------------------------------
>
> Key: HIVE-22294
> URL: https://issues.apache.org/jira/browse/HIVE-22294
> Project: Hive
> Issue Type: Bug
> Components: Physical Optimizer
> Affects Versions: 2.3.0, 2.3.4, 3.1.1
> Reporter: Qiang.Kang
> Assignee: Nemon Lou
> Priority: Critical
> Labels: pull-request-available
> Time Spent: 0.5h
> Remaining Estimate: 0h
>
> Our hive version is 1.2.1 which has merged some patches (including patches mentioned in https://issues.apache.org/jira/browse/HIVE-14557, https://issues.apache.org/jira/browse/HIVE-16155 ) .
>
> My sql query string is like this:
> {code:java}
> // code placeholder
> set hive.auto.convert.join = true;
> set hive.optimize.skewjoin=true;
>
> SELECT a.*
> FROM
> a
> JOIN b
> ON a.id=b.id AND a.uid = b.uid
> LEFT JOIN c
> ON b.id=c.id AND b.uid=c.uid;
>
> {code}
>
> And we met some error:
> FAILED: ClassCastException org.apache.hadoop.hive.ql.plan.ConditionalWork cannot be cast to org.apache.hadoop.hive.ql.plan.MapredWork
>
> The main reason is that there is a conditional task (*MapJoin*) in the list tasks of another Conditional task (*SkewJoin*). Here is the code snippet where it throws this exception:
> `org.apache.hadoop.hive.ql.optimizer.physical.MapJoinResolver:`
>
> {code:java}
> // code placeholder
> public Object dispatch(Node nd, Stack<Node> stack, Object... nodeOutputs)
> throws SemanticException {
> Task<? extends Serializable> currTask = (Task<? extends Serializable>) nd;
> // not map reduce task or not conditional task, just skip
> if (currTask.isMapRedTask()) {
> if (currTask instanceof ConditionalTask) {
> // get the list of task
> List<Task<? extends Serializable>> taskList = ((ConditionalTask) currTask).getListTasks();
> for (Task<? extends Serializable> tsk : taskList) {
> if (tsk.isMapRedTask())
> { // ATTENTION: tsk May be ConditionalTask !!! this.processCurrentTask(tsk, ((ConditionalTask) currTask)); }
> }
> } else
> { this.processCurrentTask(currTask, null); }
> }
> return null;
> }
> private void processCurrentTask(Task<? extends Serializable> currTask,
> ConditionalTask conditionalTask) throws SemanticException {
> // get current mapred work and its local work
> MapredWork mapredWork = (MapredWork) currTask.getWork(); // WRONG!!!!!!
> MapredLocalWork localwork = mapredWork.getMapWork().getMapRedLocalWork();
>
> {code}
>
> Here is some detail Information about query plan:
> *
> -- set hive.auto.convert.join = true; set hive.optimize.skewjoin=false;*
> {code:java}
> // code placeholder
> Stage-1 is a root stage [a join b]
> Stage-12 [map join]depends on stages: Stage-1 , consists of Stage-13, Stage-2
> Stage-13 has a backup stage: Stage-2
> Stage-11 depends on stages: Stage-13
> Stage-8 depends on stages: Stage-2, Stage-11 , consists of Stage-5, Stage-4, Stage-6
> Stage-5
> Stage-0 depends on stages: Stage-5, Stage-4, Stage-7
> Stage-14 depends on stages: Stage-0
> Stage-3 depends on stages: Stage-14
> Stage-4
> Stage-6
> Stage-7 depends on stages: Stage-6
> Stage-2
>
> {code}
> *
> -- set hive.auto.convert.join = false; set hive.optimize.skewjoin=true;*
> {code:java}
> // code placeholder
> STAGE DEPENDENCIES:
> Stage-1 is a root stage
> Stage-12 depends on stages: Stage-1 , consists of Stage-13, Stage-2
> Stage-13 [skew Join map local task]
> Stage-11 depends on stages: Stage-13
> Stage-2 depends on stages: Stage-11
> Stage-8 depends on stages: Stage-2 , consists of Stage-5, Stage-4, Stage-6
> Stage-5
> Stage-0 depends on stages: Stage-5, Stage-4, Stage-7
> Stage-14 depends on stages: Stage-0
> Stage-3 depends on stages: Stage-14
> Stage-4
> Stage-6
> Stage-7 depends on stages: Stage-6
> {code}
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