# Package org.apache.hadoop.hdfs.server.common.blockaliasmap.impl

- Interface Summary
  Interface | Description
  --- | ---
  LevelDBFileRegionAliasMap.LevelDBReader.Options | Options for `LevelDBFileRegionAliasMap.LevelDBReader`.
  LevelDBFileRegionAliasMap.LevelDBWriter.Options | Interface for Writer options.
  TextFileRegionAliasMap.TextReader.Options | Options for `TextFileRegionAliasMap.TextReader`.
  TextFileRegionAliasMap.TextWriter.Options | Interface for Writer options.

- Class Summary
  Class | Description
  --- | ---
  LevelDBFileRegionAliasMap | A LevelDB based implementation of `BlockAliasMap`.
  LevelDBFileRegionAliasMap.LevelDBOptions | Class specifying reader options for the `LevelDBFileRegionAliasMap`.
  LevelDBFileRegionAliasMap.LevelDBReader | This class is used as a reader for block maps which are stored as LevelDB files.
  LevelDBFileRegionAliasMap.LevelDBWriter | This class is used as a writer for block maps which are stored as LevelDB files.
  TextFileRegionAliasMap | This class is used for block maps stored as text files, with a specified delimiter.
  TextFileRegionAliasMap.ReaderOptions | Class specifying reader options for the `TextFileRegionAliasMap`.
  TextFileRegionAliasMap.TextReader | This class is used as a reader for block maps which are stored as delimited text files.
  TextFileRegionAliasMap.TextWriter | This class is used as a writer for block maps which are stored as delimited text files.
  TextFileRegionAliasMap.WriterOptions | Class specifying writer options for the `TextFileRegionAliasMap`.

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