Ajantha Bhat created CARBONDATA-3919:
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Summary: Improve concurrent query performance
Key: CARBONDATA-3919
URL: https://issues.apache.org/jira/browse/CARBONDATA-3919
Project: CarbonData
Issue Type: Improvement
Reporter: Ajantha Bhat
Assignee: Ajantha Bhat
problem1: when 500 queries executed concurrently.
checkIfRefreshIsNeeded method was synchronized. so only one thread was working
at time.
But actually synchronization is required only when schema modified to drop
tables. Not for whole function
solution: synchronize only remove table part. Observed 500 query total
performance improved from 10s to 3 seconds in cluster.
problem2:
TokenCache.obtainTokensForNamenodes was causing a performance bottleneck for
concurrent queries. so, removed it
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