本文整理汇总了Java中org.apache.hadoop.fs.FileSystem.truncate方法的典型用法代码示例。如果您正苦于以下问题：Java FileSystem.truncate方法的具体用法？Java FileSystem.truncate怎么用？Java FileSystem.truncate使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类org.apache.hadoop.fs.FileSystem的用法示例。
在下文中一共展示了FileSystem.truncate方法的2个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的Java代码示例。
示例1: testTruncate
import org.apache.hadoop.fs.FileSystem; //导入方法依赖的package包/类
private void testTruncate() throws Exception {
if (!isLocalFS()) {
final short repl = 3;
final int blockSize = 1024;
final int numOfBlocks = 2;
FileSystem fs = FileSystem.get(getProxiedFSConf());
fs.mkdirs(getProxiedFSTestDir());
Path file = new Path(getProxiedFSTestDir(), "foo.txt");
final byte[] data = FileSystemTestHelper.getFileData(
numOfBlocks, blockSize);
FileSystemTestHelper.createFile(fs, file, data, blockSize, repl);
final int newLength = blockSize;
boolean isReady = fs.truncate(file, newLength);
Assert.assertTrue("Recovery is not expected.", isReady);
FileStatus fileStatus = fs.getFileStatus(file);
Assert.assertEquals(fileStatus.getLen(), newLength);
AppendTestUtil.checkFullFile(fs, file, newLength, data, file.toString());
fs.close();
}
}
示例2: execute
import org.apache.hadoop.fs.FileSystem; //导入方法依赖的package包/类
/**
* Executes the filesystem operation.
*
* @param fs filesystem instance to use.
*
* @return <code>true</code> if the file has been truncated to the desired,
* <code>false</code> if a background process of adjusting the
* length of the last block has been started, and clients should
* wait for it to complete before proceeding with further file
* updates.
*
* @throws IOException thrown if an IO error occured.
*/
@Override
public JSONObject execute(FileSystem fs) throws IOException {
boolean result = fs.truncate(path, newLength);
return toJSON(
StringUtils.toLowerCase(HttpFSFileSystem.TRUNCATE_JSON), result);
}