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https://issues.apache.org/jira/browse/HIVE-19450?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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zhuwei updated HIVE-19450:
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Status: Patch Available (was: Open)
The fix is to further checkout parent task's backup task.
> OOM due to map join and backup task not invoked
> -----------------------------------------------
>
> Key: HIVE-19450
> URL: https://issues.apache.org/jira/browse/HIVE-19450
> Project: Hive
> Issue Type: Bug
> Reporter: zhuwei
> Assignee: zhuwei
> Priority: Major
> Attachments: HIVE-19450.1.patch
>
>
> Map join task may cause OOM due to orc compression , in most cases , a backup
> task will be invoked. However , if the size of hash table is close to memory
> limit, the task which load the hash table will NOT fail . OOM will happen in
> next task witch do local join. The load task has a backup but next task not.
> So in this case , the whole query will fail.
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