public class DistCpUtils extends Object
构造器和说明 |
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DistCpUtils() |
限定符和类型 | 方法和说明 |
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static boolean |
checksumsAreEqual(FileSystem sourceFS,
Path source,
FileSystem targetFS,
Path target)
Utility to compare checksums for the paths specified.
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static boolean |
compareFs(FileSystem srcFs,
FileSystem destFs) |
static long |
getFileSize(Path path,
Configuration configuration)
Retrieves size of the file at the specified path.
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static DecimalFormat |
getFormatter() |
static int |
getInt(Configuration configuration,
String label)
Utility to retrieve a specified key from a Configuration.
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static long |
getLong(Configuration configuration,
String label)
Utility to retrieve a specified key from a Configuration.
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static int |
getNumMapTasks(Configuration configuration) |
static String |
getRelativePath(Path sourceRootPath,
Path childPath)
Gets relative path of child path with respect to a root path
For ex.
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static Class<? extends InputFormat> |
getStrategy(Configuration conf,
DistCpOptions options)
Returns the class that implements a copy strategy.
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static String |
getStringDescriptionFor(long nBytes) |
static String |
packAttributes(EnumSet<DistCpOptions.FileAttribute> attributes)
Pack file preservation attributes into a string, containing
just the first character of each preservation attribute
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static void |
preserve(FileSystem targetFS,
Path path,
FileStatus srcFileStatus,
EnumSet<DistCpOptions.FileAttribute> attributes)
Preserve attribute on file matching that of the file status being sent
as argument.
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static <T> void |
publish(Configuration configuration,
String label,
T value)
Utility to publish a value to a configuration.
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static Path |
sortListing(FileSystem fs,
Configuration conf,
Path sourceListing)
Sort sequence file containing FileStatus and Text as key and value respecitvely
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static EnumSet<DistCpOptions.FileAttribute> |
unpackAttributes(String attributes)
Un packs preservation attribute string containing the first character of
each preservation attribute back to a set of attributes to preserve
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public static long getFileSize(Path path, Configuration configuration) throws IOException
path
- The path of the file whose size is sought.configuration
- Configuration, to retrieve the appropriate FileSystem.IOException,
- on failure.IOException
public static <T> void publish(Configuration configuration, String label, T value)
T
- The type of the value.configuration
- The Configuration to which the value must be written.label
- The label for the value being published.value
- The value being published.public static int getInt(Configuration configuration, String label)
configuration
- The Configuration in which the key is sought.label
- The key being sought.public static int getNumMapTasks(Configuration configuration)
public static long getLong(Configuration configuration, String label)
configuration
- The Configuration in which the key is sought.label
- The key being sought.public static Class<? extends InputFormat> getStrategy(Configuration conf, DistCpOptions options)
conf
- - Configuration objectoptions
- - Handle to input optionspublic static String getRelativePath(Path sourceRootPath, Path childPath)
sourceRootPath
- - Source root pathchildPath
- - Path for which relative path is requiredpublic static String packAttributes(EnumSet<DistCpOptions.FileAttribute> attributes)
attributes
- - Attribute set to preservepublic static EnumSet<DistCpOptions.FileAttribute> unpackAttributes(String attributes)
attributes
- - Attribute stringpublic static void preserve(FileSystem targetFS, Path path, FileStatus srcFileStatus, EnumSet<DistCpOptions.FileAttribute> attributes) throws IOException
targetFS
- - File systempath
- - Path that needs to preserve original file statussrcFileStatus
- - Original file statusattributes
- - Attribute set that need to be preservedIOException
- - Exception if any (particularly relating to group/owner
change or any transient error)public static Path sortListing(FileSystem fs, Configuration conf, Path sourceListing) throws IOException
fs
- - File Systemconf
- - ConfigurationsourceListing
- - Source listing fileIOException
- - Any exception during sort.public static DecimalFormat getFormatter()
public static String getStringDescriptionFor(long nBytes)
public static boolean checksumsAreEqual(FileSystem sourceFS, Path source, FileSystem targetFS, Path target) throws IOException
sourceFS
- FileSystem for the source path.source
- The source path.targetFS
- FileSystem for the target path.target
- The target path.IOException
- if there's an exception while retrieving checksums.public static boolean compareFs(FileSystem srcFs, FileSystem destFs)
Copyright © 2009 The Apache Software Foundation