org.apache.hadoop.yarn.api.ApplicationConstants Maven / Gradle / Ivy
/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.hadoop.yarn.api;
import org.apache.hadoop.classification.InterfaceAudience.Public;
import org.apache.hadoop.classification.InterfaceStability.Evolving;
import org.apache.hadoop.classification.InterfaceStability.Unstable;
import org.apache.hadoop.security.UserGroupInformation;
import org.apache.hadoop.util.Shell;
/**
* 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.
*/
@Public
@Evolving
public interface ApplicationConstants {
/**
* The environment variable for APP_SUBMIT_TIME. Set in AppMaster environment
* only
*/
public static final String APP_SUBMIT_TIME_ENV = "APP_SUBMIT_TIME_ENV";
/**
* The cache file into which container token is written
*/
public static final String CONTAINER_TOKEN_FILE_ENV_NAME =
UserGroupInformation.HADOOP_TOKEN_FILE_LOCATION;
/**
* 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.
*/
public static final String APPLICATION_WEB_PROXY_BASE_ENV =
"APPLICATION_WEB_PROXY_BASE";
/**
* The temporary environmental variable for container log directory. This
* should be replaced by real container log directory on container launch.
*/
public static final String LOG_DIR_EXPANSION_VAR = "";
/**
* 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.
*/
@Public
@Unstable
public static final String CLASS_PATH_SEPARATOR= "";
/**
* 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.
*/
@Public
@Unstable
public static final String PARAMETER_EXPANSION_LEFT="{{";
/**
* 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.
*/
@Public
@Unstable
public static final String PARAMETER_EXPANSION_RIGHT="}}";
public static final String STDERR = "stderr";
public static final String STDOUT = "stdout";
/**
* The environment variable for MAX_APP_ATTEMPTS. Set in AppMaster environment
* only
*/
public static final String MAX_APP_ATTEMPTS_ENV = "MAX_APP_ATTEMPTS";
/**
* Environment for Applications.
*
* Some of the environment variables for applications are final
* i.e. they cannot be modified by the applications.
*/
public enum Environment {
/**
* $USER
* Final, non-modifiable.
*/
USER("USER"),
/**
* $LOGNAME
* Final, non-modifiable.
*/
LOGNAME("LOGNAME"),
/**
* $HOME
* Final, non-modifiable.
*/
HOME("HOME"),
/**
* $PWD
* Final, non-modifiable.
*/
PWD("PWD"),
/**
* $PATH
*/
PATH("PATH"),
/**
* $SHELL
*/
SHELL("SHELL"),
/**
* $JAVA_HOME
*/
JAVA_HOME("JAVA_HOME"),
/**
* $CLASSPATH
*/
CLASSPATH("CLASSPATH"),
/**
* $APP_CLASSPATH
*/
APP_CLASSPATH("APP_CLASSPATH"),
/**
* $HADOOP_CLASSPATH.
*/
HADOOP_CLASSPATH("HADOOP_CLASSPATH"),
/**
* $LD_LIBRARY_PATH
*/
LD_LIBRARY_PATH("LD_LIBRARY_PATH"),
/**
* $HADOOP_CONF_DIR
* Final, non-modifiable.
*/
HADOOP_CONF_DIR("HADOOP_CONF_DIR"),
/**
* $HADOOP_COMMON_HOME
*/
HADOOP_COMMON_HOME("HADOOP_COMMON_HOME"),
/**
* $HADOOP_HDFS_HOME
*/
HADOOP_HDFS_HOME("HADOOP_HDFS_HOME"),
/**
* $MALLOC_ARENA_MAX
*/
MALLOC_ARENA_MAX("MALLOC_ARENA_MAX"),
/**
* $HADOOP_YARN_HOME
*/
HADOOP_YARN_HOME("HADOOP_YARN_HOME"),
/**
* $CONTAINER_ID
* Final, exported by NodeManager and non-modifiable by users.
*/
CONTAINER_ID("CONTAINER_ID"),
/**
* $NM_HOST
* Final, exported by NodeManager and non-modifiable by users.
*/
NM_HOST("NM_HOST"),
/**
* $NM_HTTP_PORT
* Final, exported by NodeManager and non-modifiable by users.
*/
NM_HTTP_PORT("NM_HTTP_PORT"),
/**
* $NM_PORT
* Final, exported by NodeManager and non-modifiable by users.
*/
NM_PORT("NM_PORT"),
/**
* $LOCAL_DIRS
* Final, exported by NodeManager and non-modifiable by users.
*/
LOCAL_DIRS("LOCAL_DIRS"),
/**
* $LOG_DIRS
* Final, exported by NodeManager and non-modifiable by users.
* Comma separate list of directories that the container should use for
* logging.
*/
LOG_DIRS("LOG_DIRS");
private final String variable;
private Environment(String variable) {
this.variable = variable;
}
public String key() {
return variable;
}
public String toString() {
return variable;
}
/**
* Expand the environment variable based on client OS environment variable
* expansion syntax (e.g. $VAR for Linux and %VAR% for Windows).
*
* Note: Use $$() method for cross-platform practice i.e. submit an
* application from a Windows client to a Linux/Unix server or vice versa.
*
*/
public String $() {
if (Shell.WINDOWS) {
return "%" + variable + "%";
} else {
return "$" + variable;
}
}
/**
* Expand the environment variable in platform-agnostic syntax. The
* parameter expansion marker "{{VAR}}" will be replaced with real parameter
* expansion marker ('%' for Windows and '$' for Linux) by NodeManager on
* container launch. For example: {{VAR}} will be replaced as $VAR on Linux,
* and %VAR% on Windows.
*/
@Public
@Unstable
public String $$() {
return PARAMETER_EXPANSION_LEFT + variable + PARAMETER_EXPANSION_RIGHT;
}
}
}