The Java class org.apache.hadoop.fs.FSDataInputStream is a implementation of the abstract class DataInputStream that provides a convenient way to read data from files in the Hadoop distributed file system (HDFS) or other file systems supported by Hadoop. It inherits methods from the DataInputStream class and also includes additional methods specific to Hadoop file systems. FSDataInputStream allows reading data in various formats such as bytes, UTF-8 encoded strings, integers, longs, etc. It also supports operations like seeking to a specific position in the file and checking the available number of bytes to read.
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