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Chris Lu
60dae3887d
Enhances FilerClient to automatically discover additional filers in the same
filer group by querying the master server. This allows users to specify just
a few seed filers, and the client will discover all other filers in the cluster.
Key changes to wdclient/FilerClient:
- Added MasterClient, FilerGroup, and DiscoveryInterval fields
- Added thread-safe filer list management with RWMutex
- Implemented discoverFilers() background goroutine
- Uses cluster.ListExistingPeerUpdates() to query master for filers
- Automatically adds newly discovered filers to the list
- Added Close() method to clean up discovery goroutine
New FilerClientOption fields:
- MasterClient: enables filer discovery from master
- FilerGroup: specifies which filer group to discover
- DiscoveryInterval: how often to refresh (default 5 minutes)
Usage example:
masterClient := wdclient.NewMasterClient(...)
filerClient := wdclient.NewFilerClient(
[]pb.ServerAddress{"localhost:8888"}, // seed filers
grpcDialOption,
dataCenter,
&wdclient.FilerClientOption{
MasterClient: masterClient,
FilerGroup: "my-group",
},
)
defer filerClient.Close()
The initial filers act as seeds - the client discovers and adds all other
filers in the same group from the master. Discovered filers are added
dynamically without removing existing ones (relying on health checks for
unavailable filers).