Mehrdad Nurolahzade created AURORA-1865:
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Summary: Experiment with Increasing H2 QUERY_CACHE_SIZE
Key: AURORA-1865
URL: https://issues.apache.org/jira/browse/AURORA-1865
Project: Aurora
Issue Type: Story
Components: Scheduler
Reporter: Mehrdad Nurolahzade
Priority: Minor
Aurora scheduler is not setting a value for {{QUERY_CACHE_SIZE}}, therefore it
is relying on H2's default cache size of 8 statements. There might be potential
performance gain from increasing H2 query cache size ([example discussion
thread|https://groups.google.com/forum/#!topic/h2-database/pGG9HA5ckhw]).
Looking at execution count of queries (in
{{INFORMATION_SCHEMA.QUERY_STATISTICS}} meta table), selecting host attributes
query is repeated 2-3 orders of magnitude more than other queries, giving it a
substantial cumulative execution cost. Scheduler needs to ensure all such high
frequency statements are always cached.
Verify if increasing {{QUERY_CACHE_SIZE}} positively impacts scheduler
performance.
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