Major Description
We can rely on https://github.com/apache/hive/blob/master/llap-server/src/java/org/apache/hadoop/hive/llap/IncrementalObjectSizeEstimator.java to estimate memory of SharedCache. This jira addresses the size estimation during prewarm, so that we can stop when we hit the memory limit. In a follow-up jira, we will work on estimation/eviction after prewarm is complete, so that we can keep the frequently used tables and their partitions in cache.
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