Package org.apache.hadoop.ozone.om.snapshot

Class OmSnapshotUtils

java.lang.Object

org.apache.hadoop.ozone.om.snapshot.OmSnapshotUtils

public final class OmSnapshotUtils
extends Object

Ozone Manager Snapshot Utilities.

Field Summary

Fields

Modifier and Type	Field	Description
static final String	DATA_PREFIX
static final String	DATA_SUFFIX

Method Summary

Modifier and Type	Method	Description
static Path	createHardLinkList(int truncateLength, Map<Path,Path> hardLinkFiles)	Create file of links to add to tarball.
static void	createHardLinks(Path dbPath)	Create hard links listed in OM_HARDLINK_FILE.
static Object	getINode(Path file)	Get the INode for file.
static void	linkFiles(File oldDir, File newDir)	Link each of the files in oldDir to newDir.
static String	truncateFileName(int truncateLength, Path file)	Get the filename without the introductory metadata directory.

Methods inherited from class java.lang.Object

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

Field Details

DATA_PREFIX

public static final String DATA_PREFIX

See Also:

• Constant Field Values

DATA_SUFFIX

public static final String DATA_SUFFIX

See Also:

• Constant Field Values

Method Details

truncateFileName

public static String truncateFileName(int truncateLength,
 Path file)

Get the filename without the introductory metadata directory.

Parameters:

truncateLength - Length to remove.

file - File to remove prefix from.

Returns:

Truncated string.

getINode

public static Object getINode(Path file)
                       throws IOException

Get the INode for file.

Parameters:

file - File whose INode is to be retrieved.

Returns:

INode for file.

Throws:

IOException

createHardLinkList

public static Path createHardLinkList(int truncateLength,
 Map<Path,Path> hardLinkFiles)
                               throws IOException

Create file of links to add to tarball. Format of entries are either: dir1/fileTo fileFrom for files in active db or: dir1/fileTo dir2/fileFrom for files in another directory, (either another snapshot dir or sst compaction backup directory)

Parameters:

truncateLength - - Length of initial path to trim in file path.

hardLinkFiles - - Map of link->file paths.

Returns:

Path to the file of links created.

Throws:

IOException

createHardLinks

public static void createHardLinks(Path dbPath)
                            throws IOException

Create hard links listed in OM_HARDLINK_FILE.

Parameters:

dbPath - Path to db to have links created.

Throws:

IOException

linkFiles

public static void linkFiles(File oldDir,
 File newDir)
                      throws IOException

Link each of the files in oldDir to newDir.

Parameters:

oldDir - The dir to create links from.

newDir - The dir to create links to.

Throws:

IOException