features: run single-shot multi-query sub-queries concurrently#558
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cportele wants to merge 1 commit into
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features: run single-shot multi-query sub-queries concurrently#558cportele wants to merge 1 commit into
cportele wants to merge 1 commit into
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Single-shot multi-queries read every sub-query in one pass with no cross-sub-query dependency, so the sub-queries can now execute concurrently while their rows are still emitted in sub-query order: - the value phase uses an order-preserving concurrent flat-map over the sub-queries (Transformer.flatMapConcurrent); - each sub-query's value queries are subscribed on a worker thread (SqlQueryOptions.isParallel) so the blocking JDBC reads actually overlap instead of running on a single thread; - a shared connection-budget semaphore (sized to the pool) bounds the connections held by the in-flight sub-queries and acquires each sub-query's permits as a block, so concurrent requests cannot deadlock by each holding part of the pool. Paged and single-feature reads keep the serial path. Requires the matching xtraplatform-core operators flatMapConcurrent and guarded.
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Depends on #555.
Depends on ldproxy/xtraplatform#428.
Single-shot multi-queries read every sub-query in one pass with no cross-sub-query dependency, so the sub-queries can now execute concurrently while their rows are still emitted in sub-query order:
Paged and single-feature reads keep the serial path. Requires the matching xtraplatform-core operators flatMapConcurrent and guarded.