In HDFS application development, which of the following are the interfaces supported by the HDFS service? (multiple choice)

Question

Options

• ABufferedOutputStream.write
• BBufferedOutputStream.flush
• CFileSystem.create
• DFileSystem.append

• A
  100% (58)

Explanation

All four options are correct because HDFS application development combines both HDFS-native Java APIs and standard Java I/O stream methods. FileSystem.create and FileSystem.append are core methods of the Hadoop FileSystem class - create opens a new file and returns an FSDataOutputStream, while append opens an existing file for additional writes. BufferedOutputStream.write and BufferedOutputStream.flush are standard Java I/O methods that work directly on the output stream returned by HDFS operations, since FSDataOutputStream wraps standard Java streams.

Since all choices are correct, there are no distractors - the question is designed to test whether students mistakenly exclude the standard Java I/O methods, assuming HDFS only uses Hadoop-specific APIs.

Memory tip: Think of it as two layers - HDFS gives you the file handle (FileSystem.create/append), and standard Java streams let you use that handle (write/flush). Both layers are part of HDFS development, so always include them both.

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