| Package | Description | 
|---|---|
| org.apache.hadoop.hdfs.server.common | |
| org.apache.hadoop.hdfs.server.common.blockaliasmap | The AliasMap defines mapping of PROVIDED HDFS blocks to data in remote
 storage systems. | 
| Modifier and Type | Class and Description | 
|---|---|
| class  | FileRegionThis class is used to represent provided blocks that are file regions,
 i.e., can be described using (path, offset, length). | 
| Modifier and Type | Class and Description | 
|---|---|
| class  | BlockAliasMap<T extends BlockAlias>An abstract class used to read and write block maps for provided blocks. | 
| static class  | BlockAliasMap.Reader<U extends BlockAlias>An abstract class that is used to read  BlockAliases
 for provided blocks. | 
| static class  | BlockAliasMap.Writer<U extends BlockAlias>An abstract class used as a writer for the provided block map. | 
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