org.apache.hadoop.hdfs.server.namenode.snapshot
Class INodeDirectoryWithSnapshot.DirectoryDiffList

java.lang.Object
  org.apache.hadoop.hdfs.server.namenode.snapshot.INodeDirectoryWithSnapshot.DirectoryDiffList

All Implemented Interfaces:

Iterable<INodeDirectoryWithSnapshot.DirectoryDiff>

Enclosing class:

INodeDirectoryWithSnapshot

public static class INodeDirectoryWithSnapshot.DirectoryDiffList
extends Object

A list of directory diffs.

Constructor Summary

INodeDirectoryWithSnapshot.DirectoryDiffList()

Method Summary

List<D>	asList()
void	clear() Get the size of the list and then clear it.
Quota.Counts	deleteSnapshotDiff(org.apache.hadoop.hdfs.server.namenode.snapshot.Snapshot snapshot, org.apache.hadoop.hdfs.server.namenode.snapshot.Snapshot prior, N currentINode, INode.BlocksMapUpdateInfo collectedBlocks, List<org.apache.hadoop.hdfs.server.namenode.INode> removedINodes, boolean countDiffChange) Delete a snapshot.
D	getDiff(org.apache.hadoop.hdfs.server.namenode.snapshot.Snapshot snapshot)
D	getLast()
org.apache.hadoop.hdfs.server.namenode.snapshot.Snapshot	getLastSnapshot()
org.apache.hadoop.hdfs.server.namenode.snapshot.Snapshot	getPrior(int snapshotId)
org.apache.hadoop.hdfs.server.namenode.snapshot.Snapshot	getSnapshotById(int snapshotId) Search for the snapshot whose id is 1) no less than the given id, and 2) most close to the given id.
Iterator<D>	iterator()
void	saveSelf2Snapshot(org.apache.hadoop.hdfs.server.namenode.snapshot.Snapshot latest, N currentINode, A snapshotCopy) Save the snapshot copy to the latest snapshot.
String	toString()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

INodeDirectoryWithSnapshot.DirectoryDiffList

public INodeDirectoryWithSnapshot.DirectoryDiffList()

Method Detail

asList

public final List<D> asList()

Returns:

this list as a unmodifiable List.

clear

public void clear()

Get the size of the list and then clear it.

deleteSnapshotDiff

public final Quota.Counts deleteSnapshotDiff(org.apache.hadoop.hdfs.server.namenode.snapshot.Snapshot snapshot,
                                             org.apache.hadoop.hdfs.server.namenode.snapshot.Snapshot prior,
                                             N currentINode,
                                             INode.BlocksMapUpdateInfo collectedBlocks,
                                             List<org.apache.hadoop.hdfs.server.namenode.INode> removedINodes,
                                             boolean countDiffChange)
                                      throws org.apache.hadoop.hdfs.protocol.QuotaExceededException

Delete a snapshot. The synchronization of the diff list will be done outside. If the diff to remove is not the first one in the diff list, we need to combine the diff with its previous one.

Parameters:

snapshot - The snapshot to be deleted

prior - The snapshot taken before the to-be-deleted snapshot

collectedBlocks - Used to collect information for blocksMap update

Returns:

delta in namespace.

Throws:

org.apache.hadoop.hdfs.protocol.QuotaExceededException

getLast

public final D getLast()

Returns:

the last diff.

getLastSnapshot

public final org.apache.hadoop.hdfs.server.namenode.snapshot.Snapshot getLastSnapshot()

Returns:

the last snapshot.

getPrior

public final org.apache.hadoop.hdfs.server.namenode.snapshot.Snapshot getPrior(int snapshotId)

getDiff

public final D getDiff(org.apache.hadoop.hdfs.server.namenode.snapshot.Snapshot snapshot)

Returns:

the diff corresponding to the given snapshot. When the diff is null, it means that the current state and the corresponding snapshot state are the same.

getSnapshotById

public final org.apache.hadoop.hdfs.server.namenode.snapshot.Snapshot getSnapshotById(int snapshotId)

Search for the snapshot whose id is 1) no less than the given id, and 2) most close to the given id.

saveSelf2Snapshot

public void saveSelf2Snapshot(org.apache.hadoop.hdfs.server.namenode.snapshot.Snapshot latest,
                              N currentINode,
                              A snapshotCopy)
                       throws org.apache.hadoop.hdfs.protocol.QuotaExceededException

Save the snapshot copy to the latest snapshot.

Throws:

org.apache.hadoop.hdfs.protocol.QuotaExceededException

iterator

public Iterator<D> iterator()

Specified by:

iterator in interface Iterable<D extends org.apache.hadoop.hdfs.server.namenode.snapshot.AbstractINodeDiff<N,A,D>>

toString

public String toString()

Overrides:

toString in class Object