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https://issues.apache.org/jira/browse/SPARK-22334?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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jin xing updated SPARK-22334:
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Summary: Check table size from HDFS in case the size in metastore is wrong.
(was: Check table size from Hdfs in case the size in metastore is wrong.)
> Check table size from HDFS in case the size in metastore is wrong.
> ------------------------------------------------------------------
>
> Key: SPARK-22334
> URL: https://issues.apache.org/jira/browse/SPARK-22334
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.2.0
> Reporter: jin xing
>
> Currently we use table properties('totalSize') to judge if to use broadcast
> join. Table properties are from metastore. However they can be wrong. Hive
> sometimes fails to update table properties after producing data
> successfully(e,g, NameNode timeout from
> https://github.com/apache/hive/blob/branch-1.2/metastore/src/java/org/apache/hadoop/hive/metastore/MetaStoreUtils.java#L180).
> If 'totalSize' in table properties is much smaller than its real size on
> HDFS, Spark can launch broadcast join by mistake and suffer OOM.
> Could we add a defense config and check the size from HDFS when 'totalSize'
> is below {{spark.sql.autoBroadcastJoinThreshold}}
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