feat: Add global memory-budgeted MappingManager with serverless support#5
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feat: Add global memory-budgeted MappingManager with serverless support#5
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- Implement global singleton MappingManager with 4GB default mmap budget - Add memory-based LRU eviction with 10% hysteresis headroom - Add read-only checkpoint mode for fast serverless reader startup - Add forceCheckpoint() for clean writer shutdown before reader handoff - Environment variable config: XTREE_MMAP_BUDGET, XTREE_MMAP_WINDOW_SIZE Serverless pattern now works: - Writer: insert → forceCheckpoint() → exit - Reader: open(read_only=true) → query (no WAL replay, ~0ms startup) Test fixes: - OTCheckpointTest: add mark_live_commit() after allocate() - CheckpointCoordinatorTest: fix SizeBasedTrigger assumptions Known limitation: Multi-field scaling limited by pinned mmap windows (512MB per field). Lazy remapping needed for 1000+ field workloads. Signed-off-by: Nicholas Walter Knize <nknize@apache.org>
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Serverless pattern now works:
Test fixes:
Known limitation: Multi-field scaling limited by pinned mmap windows
(512MB per field). Lazy remapping needed for 1000+ field workloads.