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Chris Lu
d80d8be012
Fixes #7721 When S3 server is configured with a filerGroup, it creates a MasterClient to enable dynamic filer discovery. However, the KeepConnectedToMaster() background goroutine was never started, causing GetMaster() to block indefinitely in WaitUntilConnected(). This resulted in the log message: WaitUntilConnected still waiting for master connection (attempt N)... being logged repeatedly every ~20 seconds. The fix adds the missing 'go masterClient.KeepConnectedToMaster(ctx)' call to properly establish the connection to master servers. Also adds unit tests to verify WaitUntilConnected respects context cancellation.