Java Code Examples for org.apache.hadoop.fs.FileSystem.getServerDefaults()

The following are Jave code examples for showing how to use getServerDefaults() of the org.apache.hadoop.fs.FileSystem class. You can vote up the examples you like. Your votes will be used in our system to get more good examples.
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Example 1
Project: hadoop   File: TestFileCreation.java   View Source Code Vote up 6 votes
/**
 * Test that server default values can be retrieved on the client side
 */
@Test
public void testServerDefaults() throws IOException {
  Configuration conf = new HdfsConfiguration();
  conf.setLong(DFS_BLOCK_SIZE_KEY, DFS_BLOCK_SIZE_DEFAULT);
  conf.setInt(DFS_BYTES_PER_CHECKSUM_KEY, DFS_BYTES_PER_CHECKSUM_DEFAULT);
  conf.setInt(DFS_CLIENT_WRITE_PACKET_SIZE_KEY, DFS_CLIENT_WRITE_PACKET_SIZE_DEFAULT);
  conf.setInt(DFS_REPLICATION_KEY, DFS_REPLICATION_DEFAULT + 1);
  conf.setInt(IO_FILE_BUFFER_SIZE_KEY, IO_FILE_BUFFER_SIZE_DEFAULT);
  MiniDFSCluster cluster = new MiniDFSCluster.Builder(conf)
                   .numDataNodes(DFSConfigKeys.DFS_REPLICATION_DEFAULT + 1)
                   .build();
  cluster.waitActive();
  FileSystem fs = cluster.getFileSystem();
  try {
    FsServerDefaults serverDefaults = fs.getServerDefaults();
    assertEquals(DFS_BLOCK_SIZE_DEFAULT, serverDefaults.getBlockSize());
    assertEquals(DFS_BYTES_PER_CHECKSUM_DEFAULT, serverDefaults.getBytesPerChecksum());
    assertEquals(DFS_CLIENT_WRITE_PACKET_SIZE_DEFAULT, serverDefaults.getWritePacketSize());
    assertEquals(DFS_REPLICATION_DEFAULT + 1, serverDefaults.getReplication());
    assertEquals(IO_FILE_BUFFER_SIZE_DEFAULT, serverDefaults.getFileBufferSize());
  } finally {
    fs.close();
    cluster.shutdown();
  }
}