Mars Hall created PIO-115:
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Summary: Cache name-to-ID lookups for Storage app & channel
Key: PIO-115
URL: https://issues.apache.org/jira/browse/PIO-115
Project: PredictionIO
Issue Type: Improvement
Components: Core
Affects Versions: 0.11.0-incubating
Reporter: Mars Hall
Assignee: Mars Hall
When stress testing the Universal Recommender with high-concurrency HTTP/REST
queries, we observed that Elasticsearch traffic was majority composed of
requests resolving the Storage app's name & channel, over and over and over
again! In this case, [each per-query call to
`LEventStore.findByEntity`|https://github.com/heroku/predictionio-engine-ur/blob/master/src/main/scala/URAlgorithm.scala#L694]
re-resolves the app name to an ID.
This changeset implements memoization for the function that performs these
name-to-ID lookups, so that only one set of lookups is performed per process
for each app+channel combination. As a result, we've seen overall throughput
increase 📈 and error rate drop dramatically 📉.
This common optimization effects all storage backends, not just Elasticsearch.
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