Appending File Content

Updated on 2022-09-14 GMT+08:00

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Function Description

Append specific content to a specified file in HDFS. The process is as follows:

Instantiate a FileSystem.
Use the FileSystem instance to obtain various related resources.
Add the content to the specified file in HDFS.

NOTE:

Close all requested resources after appending the file content.

Sample Code

The following provides code snippets. For complete codes, see the HdfsMain and HdfsWriter classes in com.huawei.bigdata.hdfs.examples.

 /**
 * Append file content.
 *
 * @throws IOException
 */
private void append() throws Exception {
     final String content = "I append this content.";
     InputStream in = (InputStream) new ByteArrayInputStream(
     content.getBytes());
   try {
     HdfsWriter writer = new HdfsWriter(fSystem, DEST_PATH
        + File.separator + FILE_NAME);
     writer.doAppend(in);
    System.out.println("success to append.");
    } finally {
// Stream resources must be closed.
    close(in);
    }
}

Parent topic: Application Development

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