org.apache.hadoop.yarn.api

Interface ApplicationConstants

@InterfaceAudience.Public
 @InterfaceStability.Evolving
public interface ApplicationConstants

This is the API for the applications comprising of constants that YARN sets up for the applications and the containers. TODO: Investigate the semantics and security of each cross-boundary refs.

Nested Class Summary

Nested Classes

Modifier and Type	Interface and Description
static class	ApplicationConstants.ContainerLaunchType The type of launch for the container.

Field Summary

Fields

Modifier and Type	Field and Description
static String	APP_SUBMIT_TIME_ENV The environment variable for APP_SUBMIT_TIME.
static String	APPLICATION_WEB_PROXY_BASE_ENV The environmental variable for APPLICATION_WEB_PROXY_BASE.
static String	CLASS_PATH_SEPARATOR This constant is used to construct class path and it will be replaced with real class path separator(':' for Linux and ';' for Windows) by NodeManager on container launch.
static String	CONTAINER_TOKEN_FILE_ENV_NAME The cache file into which container token is written
static String	LOG_DIR_EXPANSION_VAR The temporary environmental variable for container log directory.
static String	PARAMETER_EXPANSION_LEFT The following two constants are used to expand parameter and it will be replaced with real parameter expansion marker ('%' for Windows and '$' for Linux) by NodeManager on container launch.
static String	PARAMETER_EXPANSION_RIGHT User has to use this constant to construct class path if user wants cross-platform practice i.e.
static String	STDERR
static String	STDOUT

Field Detail

APP_SUBMIT_TIME_ENV

static final String APP_SUBMIT_TIME_ENV

The environment variable for APP_SUBMIT_TIME. Set in AppMaster environment only

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Constant Field Values

CONTAINER_TOKEN_FILE_ENV_NAME

static final String CONTAINER_TOKEN_FILE_ENV_NAME

The cache file into which container token is written

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Constant Field Values

APPLICATION_WEB_PROXY_BASE_ENV

static final String APPLICATION_WEB_PROXY_BASE_ENV

The environmental variable for APPLICATION_WEB_PROXY_BASE. Set in ApplicationMaster's environment only. This states that for all non-relative web URLs in the app masters web UI what base should they have.

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Constant Field Values

LOG_DIR_EXPANSION_VAR

static final String LOG_DIR_EXPANSION_VAR

The temporary environmental variable for container log directory. This should be replaced by real container log directory on container launch.

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Constant Field Values

CLASS_PATH_SEPARATOR

@InterfaceAudience.Public
 @InterfaceStability.Unstable
static final String CLASS_PATH_SEPARATOR

This constant is used to construct class path and it will be replaced with real class path separator(':' for Linux and ';' for Windows) by NodeManager on container launch. User has to use this constant to construct class path if user wants cross-platform practice i.e. submit an application from a Windows client to a Linux/Unix server or vice versa.

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Constant Field Values

PARAMETER_EXPANSION_LEFT

@InterfaceAudience.Public
 @InterfaceStability.Unstable
static final String PARAMETER_EXPANSION_LEFT

The following two constants are used to expand parameter and it will be replaced with real parameter expansion marker ('%' for Windows and '$' for Linux) by NodeManager on container launch. For example: {{VAR}} will be replaced as $VAR on Linux, and %VAR% on Windows. User has to use this constant to construct class path if user wants cross-platform practice i.e. submit an application from a Windows client to a Linux/Unix server or vice versa.

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Constant Field Values

PARAMETER_EXPANSION_RIGHT

@InterfaceAudience.Public
 @InterfaceStability.Unstable
static final String PARAMETER_EXPANSION_RIGHT

User has to use this constant to construct class path if user wants cross-platform practice i.e. submit an application from a Windows client to a Linux/Unix server or vice versa.

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Constant Field Values

STDERR

static final String STDERR

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Constant Field Values

STDOUT

static final String STDOUT

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Constant Field Values