Padma Penumarthy created DRILL-5290:
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Summary: Provide an option to build operator table once for
built-in static functions and reuse it across queries.
Key: DRILL-5290
URL: https://issues.apache.org/jira/browse/DRILL-5290
Project: Apache Drill
Issue Type: Bug
Affects Versions: 1.9.0
Reporter: Padma Penumarthy
Assignee: Padma Penumarthy
Fix For: 1.10
Currently, DrillOperatorTable which contains standard SQL operators and
functions and Drill User Defined Functions (UDFs) (built-in and dynamic) gets
built for each query as part of creating QueryContext. This is an expensive
operation ( ~30 msec to build) and allocates ~2M on heap for each query. For
high throughput, concurrent low latency operational queries, we quickly run out
of heap memory, causing JVM hangs. Build operator table once during startup for
static built-in functions and save in DrillbitContext, so we can reuse it
across queries.
Provide an system/session option to not use dynamic UDFs so we can use the
operator table saved in DrillbitContext and avoid building each time.
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