| Interface | Description | 
|---|---|
| BlacklistManager | Tracks blacklists based on failures reported on nodes. | 
| Class | Description | 
|---|---|
| DisabledBlacklistManager | A  BlacklistManagerthat returns no blacklists. | 
| SimpleBlacklistManager | Maintains a list of failed nodes and returns that as long as number of
 blacklisted nodes is below a threshold percentage of total nodes. | 
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