Dave DeCaprio created SPARK-26548:
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Summary: Don't block during query optimization
Key: SPARK-26548
URL: https://issues.apache.org/jira/browse/SPARK-26548
Project: Spark
Issue Type: Improvement
Components: SQL
Affects Versions: 2.4.0
Reporter: Dave DeCaprio
In Spark 2.4.0 the CacheManager was updated so it will not execute jobs while
it holds a lock.This was introduced in -SPARK-23880.-
The CacheManager still holds a write lock during the execution of the query
optimizer. For complex queries the optimizer can run for a long time (we see
10-15 minutes for some exceptionally large queries). This allows only 1 thread
to optimize at once.
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