本文整理汇总了Java中org.apache.hadoop.hdfs.DistributedFileSystem.getSnapshotDiffReport方法的典型用法代码示例。如果您正苦于以下问题：Java DistributedFileSystem.getSnapshotDiffReport方法的具体用法？Java DistributedFileSystem.getSnapshotDiffReport怎么用？Java DistributedFileSystem.getSnapshotDiffReport使用的例子？那么, 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.hdfs.DistributedFileSystem的用法示例。
在下文中一共展示了DistributedFileSystem.getSnapshotDiffReport方法的3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: checkNoChange
import org.apache.hadoop.hdfs.DistributedFileSystem; //导入方法依赖的package包/类
/**
* Compute the snapshot diff on the given file system. Return true if the diff
* is empty, i.e., no changes have happened in the FS.
*/
private static boolean checkNoChange(DistCpOptions inputOptions,
DistributedFileSystem fs, Path path) {
try {
SnapshotDiffReport targetDiff =
fs.getSnapshotDiffReport(path, inputOptions.getFromSnapshot(), "");
if (!targetDiff.getDiffList().isEmpty()) {
DistCp.LOG.warn("The target has been modified since snapshot "
+ inputOptions.getFromSnapshot());
return false;
} else {
return true;
}
} catch (IOException e) {
DistCp.LOG.warn("Failed to compute snapshot diff on " + path, e);
}
return false;
}
示例2: run
import org.apache.hadoop.hdfs.DistributedFileSystem; //导入方法依赖的package包/类
@Override
public int run(String[] argv) throws Exception {
String description = "hdfs snapshotDiff <snapshotDir> <from> <to>:\n" +
"\tGet the difference between two snapshots, \n" +
"\tor between a snapshot and the current tree of a directory.\n" +
"\tFor <from>/<to>, users can use \".\" to present the current status,\n" +
"\tand use \".snapshot/snapshot_name\" to present a snapshot,\n" +
"\twhere \".snapshot/\" can be omitted\n";
if(argv.length != 3) {
System.err.println("Usage: \n" + description);
return 1;
}
FileSystem fs = FileSystem.get(getConf());
if (! (fs instanceof DistributedFileSystem)) {
System.err.println(
"SnapshotDiff can only be used in DistributedFileSystem");
return 1;
}
DistributedFileSystem dfs = (DistributedFileSystem) fs;
Path snapshotRoot = new Path(argv[0]);
String fromSnapshot = getSnapshotName(argv[1]);
String toSnapshot = getSnapshotName(argv[2]);
try {
SnapshotDiffReport diffReport = dfs.getSnapshotDiffReport(snapshotRoot,
fromSnapshot, toSnapshot);
System.out.println(diffReport.toString());
} catch (IOException e) {
String[] content = e.getLocalizedMessage().split("\n");
System.err.println("snapshotDiff: " + content[0]);
return 1;
}
return 0;
}
示例3: getDiffs
import org.apache.hadoop.hdfs.DistributedFileSystem; //导入方法依赖的package包/类
@VisibleForTesting
static DiffInfo[] getDiffs(DistCpOptions inputOptions,
DistributedFileSystem fs, Path sourceDir, Path targetDir) {
try {
final String from = getSnapshotName(inputOptions.getFromSnapshot());
final String to = getSnapshotName(inputOptions.getToSnapshot());
SnapshotDiffReport sourceDiff = fs.getSnapshotDiffReport(sourceDir,
from, to);
return DiffInfo.getDiffs(sourceDiff, targetDir);
} catch (IOException e) {
DistCp.LOG.warn("Failed to compute snapshot diff on " + sourceDir, e);
}
return null;
}