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https://issues.apache.org/jira/browse/SPARK-6618?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Yin Huai reopened SPARK-6618:
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> HiveMetastoreCatalog.lookupRelation should use fine-grained lock
> ----------------------------------------------------------------
>
> Key: SPARK-6618
> URL: https://issues.apache.org/jira/browse/SPARK-6618
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 1.3.0
> Reporter: Yin Huai
> Assignee: Yin Huai
> Priority: Blocker
> Fix For: 1.3.1, 1.4.0
>
>
> Right now the entire method of HiveMetastoreCatalog.lookupRelation has a lock
> (https://github.com/apache/spark/blob/branch-1.3/sql/hive/src/main/scala/org/apache/spark/sql/hive/HiveMetastoreCatalog.scala#L173)
> and the scope of lock will cover resolving data source tables
> (https://github.com/apache/spark/blob/branch-1.3/sql/hive/src/main/scala/org/apache/spark/sql/hive/HiveMetastoreCatalog.scala#L93).
> So, lookupRelation can be extremely expensive when we are doing expensive
> operations like parquet schema discovery. So, we should use fine-grained lock
> for lookupRelation.
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