hadoop/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/resources/yarn-default.xml

<?xml version="1.0"?>
<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>

<!--
   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.
-->

<!-- Do not modify this file directly.  Instead, copy entries that you -->
<!-- wish to modify from this file into yarn-site.xml and change them -->
<!-- there.  If yarn-site.xml does not already exist, create it.      -->

<configuration>
  
  <!-- IPC Configs -->
  <property>
    <description>Factory to create client IPC classes.</description>
    <name>yarn.ipc.client.factory.class</name>
  </property>

  <property>
    <description>Type of serialization to use.</description>
    <name>yarn.ipc.serializer.type</name>
    <value>protocolbuffers</value>
  </property>

  <property>
    <description>Factory to create server IPC classes.</description>
    <name>yarn.ipc.server.factory.class</name>
  </property>

  <property>
    <description>Factory to create IPC exceptions.</description>
    <name>yarn.ipc.exception.factory.class</name>
  </property>

  <property>
    <description>Factory to create serializeable records.</description>
    <name>yarn.ipc.record.factory.class</name>
  </property>

  <property>
    <description>RPC class implementation</description>
    <name>yarn.ipc.rpc.class</name>
    <value>org.apache.hadoop.yarn.ipc.HadoopYarnProtoRPC</value>
  </property>
  
  <!-- Resource Manager Configs -->
  <property>
    <description>The hostname of the RM.</description>
    <name>yarn.resourcemanager.hostname</name>
    <value>0.0.0.0</value>
  </property>    
  
  <property>
    <description>The address of the applications manager interface in the RM.</description>
    <name>yarn.resourcemanager.address</name>
    <value>${yarn.resourcemanager.hostname}:8032</value>
  </property>

  <property>
    <description>The number of threads used to handle applications manager requests.</description>
    <name>yarn.resourcemanager.client.thread-count</name>
    <value>50</value>
  </property>

  <property>
    <description>The expiry interval for application master reporting.</description>
    <name>yarn.am.liveness-monitor.expiry-interval-ms</name>
    <value>600000</value>
  </property>

  <property>
    <description>The Kerberos principal for the resource manager.</description>
    <name>yarn.resourcemanager.principal</name>
  </property>

  <property>
    <description>The address of the scheduler interface.</description>
    <name>yarn.resourcemanager.scheduler.address</name>
    <value>${yarn.resourcemanager.hostname}:8030</value>
  </property>

  <property>
    <description>Number of threads to handle scheduler interface.</description>
    <name>yarn.resourcemanager.scheduler.client.thread-count</name>
    <value>50</value>
  </property>

  <property>
      <description>
        This configures the HTTP endpoint for Yarn Daemons.The following
        values are supported:
        - HTTP_ONLY : Service is provided only on http
        - HTTPS_ONLY : Service is provided only on https
      </description>
      <name>yarn.http.policy</name>
      <value>HTTP_ONLY</value>
  </property>

  <property>
    <description>The http address of the RM web application.</description>
    <name>yarn.resourcemanager.webapp.address</name>
    <value>${yarn.resourcemanager.hostname}:8088</value>
  </property>

  <property>
    <description>The https adddress of the RM web application.</description>
    <name>yarn.resourcemanager.webapp.https.address</name>
    <value>${yarn.resourcemanager.hostname}:8090</value>
  </property>

  <property>
    <name>yarn.resourcemanager.resource-tracker.address</name>
    <value>${yarn.resourcemanager.hostname}:8031</value>
  </property>

  <property>
    <description>Are acls enabled.</description>
    <name>yarn.acl.enable</name>
    <value>true</value>
  </property>

  <property>
    <description>ACL of who can be admin of the YARN cluster.</description>
    <name>yarn.admin.acl</name>
    <value>*</value>
  </property>

  <property>
    <description>The address of the RM admin interface.</description>
    <name>yarn.resourcemanager.admin.address</name>
    <value>${yarn.resourcemanager.hostname}:8033</value>
  </property>

  <property>
    <description>Number of threads used to handle RM admin interface.</description>
    <name>yarn.resourcemanager.admin.client.thread-count</name>
    <value>1</value>
  </property>

  <property>
    <description>How often should the RM check that the AM is still alive.</description>
    <name>yarn.resourcemanager.amliveliness-monitor.interval-ms</name>
    <value>1000</value>
  </property>

  <property>
    <description>Maximum time to wait to establish connection to
    ResourceManager.</description>
    <name>yarn.resourcemanager.connect.max-wait.ms</name>
    <value>900000</value>
  </property>

  <property>
    <description>How often to try connecting to the
    ResourceManager.</description>
    <name>yarn.resourcemanager.connect.retry-interval.ms</name>
    <value>30000</value>
  </property>

  <property>
    <description>The maximum number of application attempts. It's a global
    setting for all application masters. Each application master can specify
    its individual maximum number of application attempts via the API, but the
    individual number cannot be more than the global upper bound. If it is,
    the resourcemanager will override it. The default number is set to 2, to
    allow at least one retry for AM.</description>
    <name>yarn.resourcemanager.am.max-attempts</name>
    <value>2</value>
  </property>

  <property>
    <description>How often to check that containers are still alive. </description>
    <name>yarn.resourcemanager.container.liveness-monitor.interval-ms</name>
    <value>600000</value>
  </property>

  <property>
    <description>The keytab for the resource manager.</description>
    <name>yarn.resourcemanager.keytab</name>
    <value>/etc/krb5.keytab</value>
  </property>

  <property>
    <description>How long to wait until a node manager is considered dead.</description>
    <name>yarn.nm.liveness-monitor.expiry-interval-ms</name>
    <value>600000</value>
  </property>

  <property>
    <description>How often to check that node managers are still alive.</description>
    <name>yarn.resourcemanager.nm.liveness-monitor.interval-ms</name>
    <value>1000</value>
  </property>

  <property>
    <description>Path to file with nodes to include.</description>
    <name>yarn.resourcemanager.nodes.include-path</name>
    <value></value>
  </property>

  <property>
    <description>Path to file with nodes to exclude.</description>
    <name>yarn.resourcemanager.nodes.exclude-path</name>
    <value></value>
  </property>

  <property>
    <description>Number of threads to handle resource tracker calls.</description>
    <name>yarn.resourcemanager.resource-tracker.client.thread-count</name>
    <value>50</value>
  </property>

  <property>
    <description>The class to use as the resource scheduler.</description>
    <name>yarn.resourcemanager.scheduler.class</name>
    <value>org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityScheduler</value>
  </property>

  <property>
    <description>The minimum allocation for every container request at the RM,
    in MBs. Memory requests lower than this won't take effect,
    and the specified value will get allocated at minimum.</description>
    <name>yarn.scheduler.minimum-allocation-mb</name>
    <value>1024</value>
  </property>

  <property>
    <description>The maximum allocation for every container request at the RM,
    in MBs. Memory requests higher than this won't take effect,
    and will get capped to this value.</description>
    <name>yarn.scheduler.maximum-allocation-mb</name>
    <value>8192</value>
  </property>

  <property>
    <description>The minimum allocation for every container request at the RM,
    in terms of virtual CPU cores. Requests lower than this won't take effect,
    and the specified value will get allocated the minimum.</description>
    <name>yarn.scheduler.minimum-allocation-vcores</name>
    <value>1</value>
  </property>

  <property>
    <description>The maximum allocation for every container request at the RM,
    in terms of virtual CPU cores. Requests higher than this won't take effect,
    and will get capped to this value.</description>
    <name>yarn.scheduler.maximum-allocation-vcores</name>
    <value>32</value>
  </property>

  <property>
    <description>Enable RM to recover state after starting. If true, then 
    yarn.resourcemanager.store.class must be specified</description>
    <name>yarn.resourcemanager.recovery.enabled</name>
    <value>false</value>
  </property>

  <property>
    <description>The class to use as the persistent store.</description>
    <name>yarn.resourcemanager.store.class</name>
    <value>org.apache.hadoop.yarn.server.resourcemanager.recovery.FileSystemRMStateStore</value>
  </property>

  <property>
    <description>Host:Port of the ZooKeeper server where RM state will 
    be stored. This must be supplied when using
    org.apache.hadoop.yarn.server.resourcemanager.recovery.ZKRMStateStore
    as the value for yarn.resourcemanager.store.class</description>
    <name>yarn.resourcemanager.zk.state-store.address</name>
    <!--value>127.0.0.1:2181</value-->
  </property>

  <property>
    <description>Number of times ZKRMStateStore tries to connect to
    ZooKeeper. This may be supplied when using
    org.apache.hadoop.yarn.server.resourcemanager.recovery.ZKRMStateStore
    as the value for yarn.resourcemanager.store.class</description>
    <name>yarn.resourcemanager.zk.state-store.num-retries</name>
    <value>3</value>
  </property>

  <property>
    <description>Full path of the ZooKeeper znode where RM state will be
    stored. This must be supplied when using
    org.apache.hadoop.yarn.server.resourcemanager.recovery.ZKRMStateStore
    as the value for yarn.resourcemanager.store.class</description>
    <name>yarn.resourcemanager.zk.state-store.parent-path</name>
    <value>/rmstore</value>
  </property>

  <property>
    <description>Timeout when connecting to ZooKeeper.
    This may be supplied when using
    org.apache.hadoop.yarn.server.resourcemanager.recovery.ZKRMStateStore
    as the value for yarn.resourcemanager.store.class</description>
    <name>yarn.resourcemanager.zk.state-store.timeout.ms</name>
    <value>60000</value>
  </property>

  <property>
    <description>ACL's to be used for ZooKeeper znodes.
    This may be supplied when using
    org.apache.hadoop.yarn.server.resourcemanager.recovery.ZKRMStateStore
    as the value for yarn.resourcemanager.store.class</description>
    <name>yarn.resourcemanager.zk.state-store.acl</name>
    <value>world:anyone:rwcda</value>
  </property>

  <property>
    <description>URI pointing to the location of the FileSystem path where
    RM state will be stored. This must be supplied when using
    org.apache.hadoop.yarn.server.resourcemanager.recovery.FileSystemRMStateStore
    as the value for yarn.resourcemanager.store.class</description>
    <name>yarn.resourcemanager.fs.state-store.uri</name>
    <value>${hadoop.tmp.dir}/yarn/system/rmstore</value>
    <!--value>hdfs://localhost:9000/rmstore</value-->
  </property>

  <property>
    <description>Enable RM high-availability. When enabled,
      (1) The RM starts in the Standby mode by default, and transitions to
      the Active mode when prompted to.
      (2) The nodes in the RM ensemble are listed in
      yarn.resourcemanager.ha.rm-ids
      (3) The id of each RM comes from yarn.resourcemanager.ha.id
      (4) The actual physical addresses come from the configs of the pattern
      - {rpc-config}.{id}</description>
    <name>yarn.resourcemanager.ha.enabled</name>
    <value>false</value>
  </property>

  <property>
    <description>The list of RM nodes in the cluster when HA is
      enabled. See description of yarn.resourcemanager.ha
      .enabled for full details on how this is used.</description>
    <name>yarn.resourcemanager.ha.rm-ids</name>
    <!--value>rm1,rm2</value-->
  </property>

  <property>
    <description>The id (string) of the current RM. When HA is enabled, this
      is a required config. See description of yarn.resourcemanager.ha.enabled
      for full details on how this is used.</description>
    <name>yarn.resourcemanager.ha.id</name>
    <!--value>rm1</value-->
  </property>

  <property>
    <description>The maximum number of completed applications RM keeps. </description>
    <name>yarn.resourcemanager.max-completed-applications</name>
    <value>10000</value>
  </property>

  <property>
    <description>Interval at which the delayed token removal thread runs</description>
    <name>yarn.resourcemanager.delayed.delegation-token.removal-interval-ms</name>
    <value>30000</value>
  </property>

  <property>
    <description>Interval for the roll over for the master key used to generate
        application tokens
    </description>
    <name>yarn.resourcemanager.application-tokens.master-key-rolling-interval-secs</name>
    <value>86400</value>
  </property>

  <property>
    <description>Interval for the roll over for the master key used to generate
        container tokens. It is expected to be much greater than
        yarn.nm.liveness-monitor.expiry-interval-ms and
        yarn.rm.container-allocation.expiry-interval-ms. Otherwise the
        behavior is undefined.
    </description>
    <name>yarn.resourcemanager.container-tokens.master-key-rolling-interval-secs</name>
    <value>86400</value>
  </property>

  <property>
    <description>The heart-beat interval in milliseconds for every NodeManager in the cluster.</description>
    <name>yarn.resourcemanager.nodemanagers.heartbeat-interval-ms</name>
    <value>1000</value>
  </property>

  <property>
    <description>The minimum allowed version of a connecting nodemanager.  The valid values are
      NONE (no version checking), EqualToRM (the nodemanager's version is equal to
      or greater than the RM version), or a Version String.</description>
    <name>yarn.resourcemanager.nodemanager.minimum.version</name>
    <value>NONE</value>
  </property>

  <property>
    <description>Enable a set of periodic monitors (specified in
        yarn.resourcemanager.scheduler.monitor.policies) that affect the
        scheduler.</description>
    <name>yarn.resourcemanager.scheduler.monitor.enable</name>
    <value>false</value>
  </property>

  <property>
    <description>The list of SchedulingEditPolicy classes that interact with
        the scheduler. A particular module may be incompatible with the
        scheduler, other policies, or a configuration of either.</description>
    <name>yarn.resourcemanager.scheduler.monitor.policies</name>
    <value>org.apache.hadoop.yarn.server.resourcemanager.monitor.capacity.ProportionalCapacityPreemptionPolicy</value>
  </property>

  <property>
    <description>Enable RM to write history data. If true, then
    yarn.resourcemanager.history-writer.class must be specified</description>
    <name>yarn.resourcemanager.history-writer.enabled</name>
    <value>false</value>
  </property>

  <property>
    <description>Number of worker threads that write the history data.</description>
    <name>yarn.resourcemanager.history-writer.multi-threaded-dispatcher.pool-size</name>
    <value>10</value>
  </property>

  <property>
    <description>The implementation class of ApplicationHistoryStore, which is
    to be used by RMApplicationHistoryWriter.
    </description>
    <name>yarn.resourcemanager.history-writer.class</name>
    <value>org.apache.hadoop.yarn.server.applicationhistoryservice.NullApplicationHistoryStore</value>
  </property>

  <!-- Node Manager Configs -->
  <property>
    <description>The hostname of the NM.</description>
    <name>yarn.nodemanager.hostname</name>
    <value>0.0.0.0</value>
  </property>
  
  <property>
    <description>The address of the container manager in the NM.</description>
    <name>yarn.nodemanager.address</name>
    <value>${yarn.nodemanager.hostname}:0</value>
  </property>

  <property>
    <description>Environment variables that should be forwarded from the NodeManager's environment to the container's.</description>
    <name>yarn.nodemanager.admin-env</name>
    <value>MALLOC_ARENA_MAX=$MALLOC_ARENA_MAX</value>
  </property>

  <property>
    <description>Environment variables that containers may override rather than use NodeManager's default.</description>
    <name>yarn.nodemanager.env-whitelist</name>
    <value>JAVA_HOME,HADOOP_COMMON_HOME,HADOOP_HDFS_HOME,HADOOP_CONF_DIR,HADOOP_YARN_HOME</value>
  </property>

  <property>
    <description>who will execute(launch) the containers.</description>
    <name>yarn.nodemanager.container-executor.class</name>
    <value>org.apache.hadoop.yarn.server.nodemanager.DefaultContainerExecutor</value>
<!--<value>org.apache.hadoop.yarn.server.nodemanager.LinuxContainerExecutor</value>-->
  </property>

  <property>
    <description>Number of threads container manager uses.</description>
    <name>yarn.nodemanager.container-manager.thread-count</name>
    <value>20</value>
  </property>

  <property>
    <description>Number of threads used in cleanup.</description>
    <name>yarn.nodemanager.delete.thread-count</name>
    <value>4</value>
  </property>

  <property>
    <description>
      Number of seconds after an application finishes before the nodemanager's 
      DeletionService will delete the application's localized file directory
      and log directory.
      
      To diagnose Yarn application problems, set this property's value large
      enough (for example, to 600 = 10 minutes) to permit examination of these
      directories. After changing the property's value, you must restart the 
      nodemanager in order for it to have an effect.

      The roots of Yarn applications' work directories is configurable with
      the yarn.nodemanager.local-dirs property (see below), and the roots
      of the Yarn applications' log directories is configurable with the 
      yarn.nodemanager.log-dirs property (see also below).
    </description>
    <name>yarn.nodemanager.delete.debug-delay-sec</name>
    <value>0</value>
  </property>

  <property>
    <description>Keytab for NM.</description>
    <name>yarn.nodemanager.keytab</name>
    <value>/etc/krb5.keytab</value>
  </property>

  <property>
    <description>List of directories to store localized files in. An 
      application's localized file directory will be found in:
      ${yarn.nodemanager.local-dirs}/usercache/${user}/appcache/application_${appid}.
      Individual containers' work directories, called container_${contid}, will
      be subdirectories of this.
   </description>
    <name>yarn.nodemanager.local-dirs</name>
    <value>${hadoop.tmp.dir}/nm-local-dir</value>
  </property>

  <property>
    <description>It limits the maximum number of files which will be localized
      in a single local directory. If the limit is reached then sub-directories
      will be created and new files will be localized in them. If it is set to
      a value less than or equal to 36 [which are sub-directories (0-9 and then
      a-z)] then NodeManager will fail to start. For example; [for public
      cache] if this is configured with a value of 40 ( 4 files +
      36 sub-directories) and the local-dir is "/tmp/local-dir1" then it will
      allow 4 files to be created directly inside "/tmp/local-dir1/filecache".
      For files that are localized further it will create a sub-directory "0"
      inside "/tmp/local-dir1/filecache" and will localize files inside it
      until it becomes full. If a file is removed from a sub-directory that
      is marked full, then that sub-directory will be used back again to
      localize files.
   </description>
    <name>yarn.nodemanager.local-cache.max-files-per-directory</name>
    <value>8192</value>
  </property>

  <property>
    <description>Address where the localizer IPC is.</description>
    <name>yarn.nodemanager.localizer.address</name>
    <value>${yarn.nodemanager.hostname}:8040</value>
  </property>

  <property>
    <description>Interval in between cache cleanups.</description>
    <name>yarn.nodemanager.localizer.cache.cleanup.interval-ms</name>
    <value>600000</value>
  </property>

  <property>
    <description>Target size of localizer cache in MB, per local directory.</description>
    <name>yarn.nodemanager.localizer.cache.target-size-mb</name>
    <value>10240</value>
  </property>

  <property>
    <description>Number of threads to handle localization requests.</description>
    <name>yarn.nodemanager.localizer.client.thread-count</name>
    <value>5</value>
  </property>

  <property>
    <description>Number of threads to use for localization fetching.</description>
    <name>yarn.nodemanager.localizer.fetch.thread-count</name>
    <value>4</value>
  </property>

  <property>
    <description>
      Where to store container logs. An application's localized log directory 
      will be found in ${yarn.nodemanager.log-dirs}/application_${appid}.
      Individual containers' log directories will be below this, in directories 
      named container_{$contid}. Each container directory will contain the files
      stderr, stdin, and syslog generated by that container.
    </description>
    <name>yarn.nodemanager.log-dirs</name>
    <value>${yarn.log.dir}/userlogs</value>
  </property>

  <property>
    <description>Whether to enable log aggregation</description>
    <name>yarn.log-aggregation-enable</name>
    <value>false</value>
  </property>

  <property>
    <description>How long to keep aggregation logs before deleting them.  -1 disables. 
    Be careful set this too small and you will spam the name node.</description>
    <name>yarn.log-aggregation.retain-seconds</name>
    <value>-1</value>
  </property> 
  
  <property>
    <description>How long to wait between aggregated log retention checks.
    If set to 0 or a negative value then the value is computed as one-tenth
    of the aggregated log retention time. Be careful set this too small and
    you will spam the name node.</description>
    <name>yarn.log-aggregation.retain-check-interval-seconds</name>
    <value>-1</value>
  </property>

  <property>
    <description>Time in seconds to retain user logs. Only applicable if
    log aggregation is disabled
    </description>
    <name>yarn.nodemanager.log.retain-seconds</name>
    <value>10800</value>
  </property>

  <property>
    <description>Where to aggregate logs to.</description>
    <name>yarn.nodemanager.remote-app-log-dir</name>
    <value>/tmp/logs</value>
  </property>
  <property>
    <description>The remote log dir will be created at 
      {yarn.nodemanager.remote-app-log-dir}/${user}/{thisParam}
    </description>
    <name>yarn.nodemanager.remote-app-log-dir-suffix</name>
    <value>logs</value>
  </property>

  <property>
    <description>Amount of physical memory, in MB, that can be allocated 
    for containers.</description>
    <name>yarn.nodemanager.resource.memory-mb</name>
    <value>8192</value>
  </property>

  <property>
    <description>Whether physical memory limits will be enforced for
    containers.</description>
    <name>yarn.nodemanager.pmem-check-enabled</name>
    <value>true</value>
  </property>

  <property>
    <description>Whether virtual memory limits will be enforced for
    containers.</description>
    <name>yarn.nodemanager.vmem-check-enabled</name>
    <value>true</value>
  </property>

  <property>
    <description>Ratio between virtual memory to physical memory when
    setting memory limits for containers. Container allocations are
    expressed in terms of physical memory, and virtual memory usage
    is allowed to exceed this allocation by this ratio.
    </description>
    <name>yarn.nodemanager.vmem-pmem-ratio</name>
    <value>2.1</value>
  </property>

  <property>
    <description>Number of CPU cores that can be allocated 
    for containers.</description>
    <name>yarn.nodemanager.resource.cpu-vcores</name>
    <value>8</value>
  </property>

  <property>
    <description>NM Webapp address.</description>
    <name>yarn.nodemanager.webapp.address</name>
    <value>${yarn.nodemanager.hostname}:8042</value>
  </property>

  <property>
    <description>How often to monitor containers.</description>
    <name>yarn.nodemanager.container-monitor.interval-ms</name>
    <value>3000</value>
  </property>

  <property>
    <description>Class that calculates containers current resource utilization.</description>
    <name>yarn.nodemanager.container-monitor.resource-calculator.class</name>
  </property>

  <property>
    <description>Frequency of running node health script.</description>
    <name>yarn.nodemanager.health-checker.interval-ms</name>
    <value>600000</value>
  </property>

  <property>
    <description>Script time out period.</description>
    <name>yarn.nodemanager.health-checker.script.timeout-ms</name>
    <value>1200000</value>
  </property>

  <property>
    <description>The health check script to run.</description>
    <name>yarn.nodemanager.health-checker.script.path</name>
    <value></value>
  </property>

  <property>
    <description>The arguments to pass to the health check script.</description>
    <name>yarn.nodemanager.health-checker.script.opts</name>
    <value></value>
  </property>

  <property>
    <description>Frequency of running disk health checker code.</description>
    <name>yarn.nodemanager.disk-health-checker.interval-ms</name>
    <value>120000</value>
  </property>

  <property>
    <description>The minimum fraction of number of disks to be healthy for the
    nodemanager to launch new containers. This correspond to both
    yarn-nodemanager.local-dirs and yarn.nodemanager.log-dirs. i.e. If there
    are less number of healthy local-dirs (or log-dirs) available, then
    new containers will not be launched on this node.</description>
    <name>yarn.nodemanager.disk-health-checker.min-healthy-disks</name>
    <value>0.25</value>
  </property>

  <property>
    <description>The path to the Linux container executor.</description>
    <name>yarn.nodemanager.linux-container-executor.path</name>
  </property>

  <property>
    <description>The class which should help the LCE handle resources.</description>
    <name>yarn.nodemanager.linux-container-executor.resources-handler.class</name>
    <value>org.apache.hadoop.yarn.server.nodemanager.util.DefaultLCEResourcesHandler</value>
    <!-- <value>org.apache.hadoop.yarn.server.nodemanager.util.CgroupsLCEResourcesHandler</value> -->
  </property>

  <property>
    <description>The cgroups hierarchy under which to place YARN proccesses (cannot contain commas).
    If yarn.nodemanager.linux-container-executor.cgroups.mount is false (that is, if cgroups have
    been pre-configured), then this cgroups hierarchy must already exist and be writable by the
    NodeManager user, otherwise the NodeManager may fail.
    Only used when the LCE resources handler is set to the CgroupsLCEResourcesHandler.</description>
    <name>yarn.nodemanager.linux-container-executor.cgroups.hierarchy</name>
    <value>/hadoop-yarn</value>
  </property>

  <property>
    <description>Whether the LCE should attempt to mount cgroups if not found.
    Only used when the LCE resources handler is set to the CgroupsLCEResourcesHandler.</description>
    <name>yarn.nodemanager.linux-container-executor.cgroups.mount</name>
    <value>false</value>
  </property>

  <property>
    <description>Where the LCE should attempt to mount cgroups if not found. Common locations
    include /sys/fs/cgroup and /cgroup; the default location can vary depending on the Linux
    distribution in use. This path must exist before the NodeManager is launched.
    Only used when the LCE resources handler is set to the CgroupsLCEResourcesHandler, and
    yarn.nodemanager.linux-container-executor.cgroups.mount is true.</description>
    <name>yarn.nodemanager.linux-container-executor.cgroups.mount-path</name>
  </property>

  <property>
    <description>The UNIX user that containers will run as when Linux-container-executor
    is used in nonsecure mode (a use case for this is using cgroups).</description>
    <name>yarn.nodemanager.linux-container-executor.nonsecure-mode.local-user</name>
    <value>nobody</value>
  </property>

  <property>
    <description>The allowed pattern for UNIX user names enforced by
    Linux-container-executor when used in nonsecure mode (use case for this
    is using cgroups). The default value is taken from /usr/sbin/adduser</description>
    <name>yarn.nodemanager.linux-container-executor.nonsecure-mode.user-pattern</name>
    <value>^[_.A-Za-z0-9][-@_.A-Za-z0-9]{0,255}?[$]?$</value>
  </property>

  <property>
    <description>T-file compression types used to compress aggregated logs.</description>
    <name>yarn.nodemanager.log-aggregation.compression-type</name>
    <value>none</value>
  </property>

  <property>
    <description>The kerberos principal for the node manager.</description>
    <name>yarn.nodemanager.principal</name>
    <value></value>
  </property>

  <property>
    <description>the valid service name should only contain a-zA-Z0-9_ and can not start with numbers</description>
    <name>yarn.nodemanager.aux-services</name>
    <value></value>
    <!--<value>mapreduce_shuffle</value>-->
  </property>

  <property>
    <description>No. of ms to wait between sending a SIGTERM and SIGKILL to a container</description>
    <name>yarn.nodemanager.sleep-delay-before-sigkill.ms</name>
    <value>250</value>
  </property>

  <property>
    <description>Max time to wait for a process to come up when trying to cleanup a container</description>
    <name>yarn.nodemanager.process-kill-wait.ms</name>
    <value>2000</value>
  </property>

  <property>
    <description>Max time, in seconds, to wait to establish a connection to RM when NM starts.
    The NM will shutdown if it cannot connect to RM within the specified max time period.
    If the value is set as -1, then NM will retry forever.</description>
    <name>yarn.nodemanager.resourcemanager.connect.wait.secs</name>
    <value>900</value>
  </property>

  <property>
    <description>Time interval, in seconds, between each NM attempt to connect to RM.</description>
    <name>yarn.nodemanager.resourcemanager.connect.retry_interval.secs</name>
    <value>30</value>
  </property>

  <property>
    <description>The minimum allowed version of a resourcemanager that a nodemanager will connect to.  
      The valid values are NONE (no version checking), EqualToNM (the resourcemanager's version is 
      equal to or greater than the NM version), or a Version String.</description>
    <name>yarn.nodemanager.resourcemanager.minimum.version</name>
    <value>NONE</value>
  </property>

  <property>
    <description>Max number of threads in NMClientAsync to process container
    management events</description>
    <name>yarn.client.nodemanager-client-async.thread-pool-max-size</name>
    <value>500</value>
  </property>
  
  <property>
  	<description>
  	  Maximum number of proxy connections for node manager. It should always be
      more than 1. NMClient and MRAppMaster will use this to cache connection
      with node manager. There will be at max one connection per node manager.
      Ex. configuring it to a value of 5 will make sure that client will at
      max have 5 connections cached with 5 different node managers. These
      connections will be timed out if idle for more than system wide idle
      timeout period. The token if used for authentication then it will be used
      only at connection creation time. If new token is received then earlier
      connection should be closed in order to use newer token. This and
      (yarn.client.nodemanager-client-async.thread-pool-max-size) are related
      and should be sync (no need for them to be equal).
  	</description>
  	<name>yarn.client.max-nodemanagers-proxies</name>
  	<value>500</value>
  </property>
  
  <!--Map Reduce configuration-->
  <property>
    <name>yarn.nodemanager.aux-services.mapreduce_shuffle.class</name>
    <value>org.apache.hadoop.mapred.ShuffleHandler</value>
  </property>

  <property>
    <name>mapreduce.job.jar</name>
    <value/>
  </property>

  <property>
    <name>mapreduce.job.hdfs-servers</name>
    <value>${fs.defaultFS}</value>
  </property>

  <!-- WebAppProxy Configuration-->
  
  <property>
    <description>The kerberos principal for the proxy, if the proxy is not
    running as part of the RM.</description>
    <name>yarn.web-proxy.principal</name>
    <value/>
  </property>
  
  <property>
    <description>Keytab for WebAppProxy, if the proxy is not running as part of 
    the RM.</description>
    <name>yarn.web-proxy.keytab</name>
  </property>
  
  <property>
    <description>The address for the web proxy as HOST:PORT, if this is not
     given then the proxy will run as part of the RM</description>
     <name>yarn.web-proxy.address</name>
     <value/>
  </property>

  <!-- Applications' Configuration-->
  
  <property>
    <description>CLASSPATH for YARN applications. A comma-separated list
    of CLASSPATH entries</description>
     <name>yarn.application.classpath</name>
     <value>$HADOOP_CONF_DIR,$HADOOP_COMMON_HOME/share/hadoop/common/*,$HADOOP_COMMON_HOME/share/hadoop/common/lib/*,$HADOOP_HDFS_HOME/share/hadoop/hdfs/*,$HADOOP_HDFS_HOME/share/hadoop/hdfs/lib/*,$HADOOP_YARN_HOME/share/hadoop/yarn/*,$HADOOP_YARN_HOME/share/hadoop/yarn/lib/*</value>
  </property>

  <!-- Application History Service's Configuration-->

  <property>
    <description>URI pointing to the location of the FileSystem path where
    the history will be persisted. This must be supplied when using
    org.apache.hadoop.yarn.server.applicationhistoryservice.FileSystemApplicationHistoryStore
    as the value for yarn.resourcemanager.history-writer.store.class</description>
    <name>yarn.ahs.fs-history-store.uri</name>
    <value>${hadoop.log.dir}/yarn/system/ahstore</value>
  </property>

  <property>
    <description>This is default address for the Application History server
    to start the RPC server.</description>
    <name>yarn.ahs.address</name>
    <value>0.0.0.0:10200</value>
  </property>

  <property>
    <description>CLient thread count to serve the client requests.</description>
    <name>yarn.ahs.client.thread-count</name>
    <value>10</value>
  </property>
  
  <property>
    <description>T-file compression types used to compress history data.</description>
    <name>yarn.ahs.fs-history-store.compression-type</name>
    <value>none</value>
  </property>
  
  <property>
	<description> Store class name for history store, defaulting to file
		system store </description>
	<name>yarn.ahs.store.class</name>
	<value>org.apache.hadoop.yarn.server.applicationhistoryservice.FileSystemApplicationHistoryStore</value>
  </property>

  <!-- Other configuration -->
  <property>
    <description>The interval of the yarn client's querying application state
    after application submission. The unit is millisecond.</description>
    <name>yarn.client.app-submission.poll-interval</name>
    <value>1000</value>
  </property>

</configuration>