Examples of org.apache.hadoop.fs.FileSystem.createSnapshot()

org.apache.hadoop.fs.FileSystem.createSnapshot()
Create a snapshot with a default name. @param path The directory where snapshots will be taken. @return the snapshot path.


      final Path foo = new Path("/foo");
      dfs.mkdirs(foo);


      try {
        webHdfs.createSnapshot(foo);
        fail("Cannot create snapshot on a non-snapshottable directory");
      } catch (Exception e) {
        GenericTestUtils.assertExceptionContains(
            "Directory is not a snapshottable directory", e);
      }

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      }


      // allow snapshots on /foo
      dfs.allowSnapshot(foo);
      // create snapshots on foo using WebHdfs
      webHdfs.createSnapshot(foo, "s1");
      // create snapshot without specifying name
      final Path spath = webHdfs.createSnapshot(foo, null);


      Assert.assertTrue(webHdfs.exists(spath));
      final Path s1path = SnapshotTestHelper.getSnapshotRoot(foo, "s1");

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      // allow snapshots on /foo
      dfs.allowSnapshot(foo);
      // create snapshots on foo using WebHdfs
      webHdfs.createSnapshot(foo, "s1");
      // create snapshot without specifying name
      final Path spath = webHdfs.createSnapshot(foo, null);


      Assert.assertTrue(webHdfs.exists(spath));
      final Path s1path = SnapshotTestHelper.getSnapshotRoot(foo, "s1");
      Assert.assertTrue(webHdfs.exists(s1path));
    } finally {

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      final Path foo = new Path("/foo");
      dfs.mkdirs(foo);
      dfs.allowSnapshot(foo);


      webHdfs.createSnapshot(foo, "s1");
      final Path spath = webHdfs.createSnapshot(foo, null);
      Assert.assertTrue(webHdfs.exists(spath));
      final Path s1path = SnapshotTestHelper.getSnapshotRoot(foo, "s1");
      Assert.assertTrue(webHdfs.exists(s1path));

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      final Path foo = new Path("/foo");
      dfs.mkdirs(foo);
      dfs.allowSnapshot(foo);


      webHdfs.createSnapshot(foo, "s1");
      final Path spath = webHdfs.createSnapshot(foo, null);
      Assert.assertTrue(webHdfs.exists(spath));
      final Path s1path = SnapshotTestHelper.getSnapshotRoot(foo, "s1");
      Assert.assertTrue(webHdfs.exists(s1path));


      // delete the two snapshots

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      final Path foo = new Path("/foo");
      dfs.mkdirs(foo);
      dfs.allowSnapshot(foo);


      webHdfs.createSnapshot(foo, "s1");
      final Path s1path = SnapshotTestHelper.getSnapshotRoot(foo, "s1");
      Assert.assertTrue(webHdfs.exists(s1path));


      // rename s1 to s2
      webHdfs.renameSnapshot(foo, "s1", "s2");

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      assertEquals(1, nnSnapshotManager.getNumSnapshottableDirs());
      
      // 2. Create a snapshot of the dir foo. This will be referenced both in
      // the SnapshotManager as well as in the file system tree. The snapshot
      // count will go up to 1.
      Path snapshotPath = fs.createSnapshot(TEST_PATH);
      assertEquals(1, nnSnapshotManager.getNumSnapshots());
      assertEquals(1, nnSnapshotManager.getNumSnapshottableDirs());
      
      // 3. Start up a 2NN and have it do a checkpoint. It will have foo and its
      // snapshot in its list of snapshottable dirs referenced from the

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      assertEquals(1, nnSnapshotManager.getNumSnapshottableDirs());
      
      // 2. Create a snapshot of the dir foo. This will be referenced both in
      // the SnapshotManager as well as in the file system tree. The snapshot
      // count will go up to 1.
      Path snapshotPath = fs.createSnapshot(TEST_PATH);
      assertEquals(1, nnSnapshotManager.getNumSnapshots());
      assertEquals(1, nnSnapshotManager.getNumSnapshottableDirs());
      
      // 3. Start up a 2NN and have it do a checkpoint. It will have foo and its
      // snapshot in its list of snapshottable dirs referenced from the

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