Github user vanzin commented on the issue: https://github.com/apache/spark/pull/22444 > so any server restart results in hours of downtime, just from scanning. Well, that's why 2.3 supports caching things on disk. Also, 2.4 has SPARK-6951 which should make this a lot faster even without disk caching. @jianjianjiao have you tried out 2.4?
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