alluxio.cli.fs.command

Class LoadMetadataCommand

java.lang.Object

alluxio.cli.fs.command.AbstractFileSystemCommand

alluxio.cli.fs.command.LoadMetadataCommand

All Implemented Interfaces:

Command, java.io.Closeable, java.lang.AutoCloseable

@ThreadSafe
 @PublicApi
public class LoadMetadataCommand
extends AbstractFileSystemCommand

Loads metadata about a path in the UFS to Alluxio. No data will be transferred. This command is a client-side optimization without storing all returned `ls` results, preventing OOM for massive amount of small files.

Field Summary

Fields inherited from class alluxio.cli.fs.command.AbstractFileSystemCommand

mFileSystem, mFsContext

Constructor Summary

Constructors

Constructor and Description
LoadMetadataCommand(FileSystemContext fsContext) Constructs a new instance to load metadata for the given Alluxio path from UFS.

Method Summary

Modifier and Type	Method and Description
java.lang.String	getCommandName()
java.lang.String	getDescription()
org.apache.commons.cli.Options	getOptions()
java.lang.String	getUsage()
int	run(org.apache.commons.cli.CommandLine cl)
protected void	runPlainPath(AlluxioURI plainPath, org.apache.commons.cli.CommandLine cl) Runs the command for a particular URI that does not contain wildcard in its path.
void	validateArgs(org.apache.commons.cli.CommandLine cl)

Methods inherited from class alluxio.cli.fs.command.AbstractFileSystemCommand

processHeader, runWildCardCmd

Methods inherited from class java.lang.Object

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

Methods inherited from interface alluxio.cli.Command

close, getSubCommands, hasSubCommand, parseAndValidateArgs

Constructor Detail

LoadMetadataCommand

public LoadMetadataCommand(FileSystemContext fsContext)

Constructs a new instance to load metadata for the given Alluxio path from UFS.

Parameters:

fsContext - the filesystem of Alluxio

Method Detail

getCommandName

public java.lang.String getCommandName()

getOptions

public org.apache.commons.cli.Options getOptions()

runPlainPath

protected void runPlainPath(AlluxioURI plainPath,
                            org.apache.commons.cli.CommandLine cl)
                     throws AlluxioException,
                            java.io.IOException

Description copied from class: AbstractFileSystemCommand

Runs the command for a particular URI that does not contain wildcard in its path.

Overrides:

runPlainPath in class AbstractFileSystemCommand

Parameters:

plainPath - an AlluxioURI that does not contain wildcard

cl - object containing the original commandLine

Throws:

AlluxioException

java.io.IOException

run

public int run(org.apache.commons.cli.CommandLine cl)
        throws AlluxioException,
               java.io.IOException

Throws:

AlluxioException

java.io.IOException

getUsage

public java.lang.String getUsage()

getDescription

public java.lang.String getDescription()

validateArgs

public void validateArgs(org.apache.commons.cli.CommandLine cl)
                  throws InvalidArgumentException

Throws:

InvalidArgumentException