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chrislu
60f9dea60a
Improved locking strategy based on the understanding that:
- vidMapLock protects the vidMap pointer from concurrent swaps
- vidMap has internal locks that protect its data structures
Changes:
1. Read operations: Grab pointer with RLock, release immediately, then operate
- Reduces lock hold time
- Allows resetVidMap to proceed sooner
- Methods: GetLocations, GetLocationsClone, GetVidLocations,
LookupVolumeServerUrl, GetDataCenter
2. Write operations: Changed from Lock() to RLock()
- RLock prevents pointer swap during operation
- Allows concurrent readers and other writers (serialized by vidMap's lock)
- Methods: addLocation, deleteLocation, addEcLocation, deleteEcLocation
Benefits:
- Significantly reduced lock contention
- Better concurrent performance under load
- Still prevents all race conditions
Verified with: go test -race ./weed/wdclient/... (passes)