Examples with DirectoryDiff org.apache.hadoop.hdfs.server.namenode.snapshot.DirectoryWithSnapshotFeature.DirectoryDiff used on opensource projects

Example 16 with DirectoryDiff

use of org.apache.hadoop.hdfs.server.namenode.snapshot.DirectoryWithSnapshotFeature.DirectoryDiff in project hadoop by apache.

the class SnapshotFSImageFormat method loadDirectoryDiff.

/**
   * Load {@link DirectoryDiff} from fsimage.
   * @param parent The directory that the SnapshotDiff belongs to.
   * @param in The {@link DataInput} instance to read.
   * @param loader The {@link Loader} instance that this loading procedure is 
   *               using.
   * @return A {@link DirectoryDiff}.
   */
private static DirectoryDiff loadDirectoryDiff(INodeDirectory parent, DataInput in, FSImageFormat.Loader loader) throws IOException {
    // 1. Read the full path of the Snapshot root to identify the Snapshot
    final Snapshot snapshot = loader.getSnapshot(in);
    // 2. Load DirectoryDiff#childrenSize
    int childrenSize = in.readInt();
    // 3. Load DirectoryDiff#snapshotINode 
    INodeDirectoryAttributes snapshotINode = loadSnapshotINodeInDirectoryDiff(snapshot, in, loader);
    // 4. Load the created list in SnapshotDiff#Diff
    List<INode> createdList = loadCreatedList(parent, in);
    // 5. Load the deleted list in SnapshotDiff#Diff
    List<INode> deletedList = loadDeletedList(parent, createdList, in, loader);
    // 6. Compose the SnapshotDiff
    List<DirectoryDiff> diffs = parent.getDiffs().asList();
    DirectoryDiff sdiff = new DirectoryDiff(snapshot.getId(), snapshotINode, diffs.isEmpty() ? null : diffs.get(0), childrenSize, createdList, deletedList, snapshotINode == snapshot.getRoot());
    return sdiff;
}