zhuwei created HIVE-19450:
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Summary: 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
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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