| Package | Description | 
|---|---|
| org.apache.cassandra.hints | Hints subsystem consists of several components. | 
| Class and Description | 
|---|
| ChecksummedDataInput A  RandomAccessReaderwrapper that calculates the CRC in place. | 
| Hint Encapsulates the hinted mutation, its creation time, and the gc grace seconds param for each table involved. | 
| HintMessage The message we use to dispatch and forward hints. | 
| HintResponse An empty successful response to a HintMessage. | 
| HintsService A singleton-ish wrapper over various hints components:
 - a catalog of all hints stores
 - a single-threaded write executor
 - a multi-threaded dispatch executor
 - the buffer pool for writing hints into
 The front-end for everything hints related. | 
| HintsServiceMBean | 
| InputPosition Marker interface for file positions as provided by the various ChecksummedDataReader implementations. | 
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