| Interface | Description | 
|---|---|
| HFileSystem.ReorderBlocks | Interface to implement to add a specific reordering logic in hdfs. | 
| Class | Description | 
|---|---|
| HFileSystem | An encapsulation for the FileSystem object that hbase uses to access
 data. | 
| HFileSystem.ReorderWALBlocks | We're putting at lowest priority the wal files blocks that are on the same datanode
 as the original regionserver which created these files. | 
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