| Class | Description | 
|---|---|
| Cell | Helper class for representing text cell and binary cell records in order to
 allow for buffering and buffered read/write. | 
| IDHandler | Functionalities for extracting numeric IDs from Hadoop taskIDs and other
 things related to modification of IDs. | 
| IDSequence | ID sequence for generating unique long identifiers with start 0 and increment 1. | 
| PairWritableBlock | Custom writable for a pair of matrix indexes and matrix block
 as required for binaryblock in remote data partitioning. | 
| PairWritableCell | Custom writable for a pair of matrix indexes and matrix cell
 as required for binarycell in remote data partitioning. | 
| StagingFileUtils | 
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