Install Apache YARN DNS Registry

Its not mqndqtory but adviced to install the yarn dns registry, if you attend to use yarn 3 new service features, as it enable to keep track of long running application on the cluster.

module.exports = header: 'YARN DNS Registry', handler: ({options}) ->

Register

  @registry.register 'hconfigure', 'ryba/lib/hconfigure'
  @registry.register 'hdp_select', 'ryba/lib/hdp_select'
  @registry.register ['file', 'jaas'], 'ryba/lib/file_jaas'

Identities

By default, the "hadoop-yarn-timelineserver" package create the following entries:

cat /etc/passwd | grep yarn
yarn:x:2403:2403:Hadoop YARN User:/var/lib/hadoop-yarn:/bin/bash
cat /etc/group | grep hadoop
hadoop:x:499:hdfs

  @system.group header: 'Hadoop Group', options.hadoop_group
  @system.group header: 'Group', options.group
  @system.user header: 'User', options.user

Wait

  @call once: true, 'masson/core/krb5_client/wait', options.wait_krb5_client

IPTables

IPTables rules are only inserted if the parameter "iptables.action" is set to "start" (default value).

  @tools.iptables
    header: 'IPTables'
    if: options.iptables
    rules: [
      { chain: 'INPUT', jump: 'ACCEPT', dport: options.yarn_site['hadoop.registry.dns.bind-port'], protocol: 'tcp', state: 'NEW', comment: "Yarn Registry PORT" }
    ]

Service

Install the "hadoop-yarn-timelineserver" service, symlink the rc.d startup script in "/etc/init.d/hadoop-hdfs-datanode" and define its startup strategy.

  @call header: 'Service', ->
    @service
      name: 'hadoop-yarn-registrydns'
    @hdp_select
      name: 'hadoop-yarn-registrydns' # Not checked
    @service.init
      header: 'Systemd Script'
      target: '/usr/lib/systemd/system/hadoop-yarn-registrydns.service'
      source: "#{__dirname}/../resources/hadoop-yarn-registrydns-systemd.j2"
      local: true
      context: options: options
      mode: 0o0644
    @system.tmpfs
      header: 'Run dir'
      mount: "#{options.pid_dir}"
      uid: options.user.name
      gid: options.hadoop_group.name
      perm: '0755'

Layout

  @call header: 'Layout', ->
    @system.mkdir
      target: "#{options.conf_dir}"
    @system.mkdir
      target: "#{options.pid_dir}"
      uid: options.user.name
      gid: options.hadoop_group.name
      mode: 0o755
    @system.mkdir
      target: "#{options.log_dir}"
      uid: options.user.name
      gid: options.group.name
      parent: true

Configuration

Update the "yarn-site.xml" configuration file.

  @hconfigure
    header: 'Core Site'
    target: "#{options.conf_dir}/core-site.xml"
    source: "#{__dirname}/../../resources/core_hadoop/core-site.xml"
    local: true
    properties: options.core_site
    backup: true
  @hconfigure
    header: 'HDFS Site'
    target: "#{options.conf_dir}/hdfs-site.xml"
    properties: options.hdfs_site
    backup: true
  @hconfigure
    header: 'YARN Site'
    target: "#{options.conf_dir}/yarn-site.xml"
    properties: options.yarn_site
    backup: true
  @file
    header: 'Log4j'
    target: "#{options.conf_dir}/log4j.properties"
    source: "#{__dirname}/../resources/log4j.properties"
    local: true
  @call header: 'Environment', ->
    YARN_REGISTRYDNS_OPTS = options.opts.base
    YARN_REGISTRYDNS_OPTS += " -D#{k}=#{v}" for k, v of options.opts.java_properties
    YARN_REGISTRYDNS_OPTS += " #{k}#{v}" for k, v of options.opts.jvm
    @file.render
      target: "#{options.conf_dir}/yarn-env.sh"
      source: "#{__dirname}/../resources/yarn-env.sh.j2"
      local: true
      context:
        security_enabled: options.krb5.realm?
        hadoop_yarn_home: options.yarn_home
        java64_home: options.java_home
        yarn_log_dir: options.log_dir
        yarn_pid_dir: options.pid_dir
        hadoop_libexec_dir: ''
        hadoop_java_io_tmpdir: "#{options.log_dir}/tmp"
        yarn_heapsize: options.heapsize
        yarn_registry_dns_jaas_file: "#{options.conf_dir}/yarn-registry.jaas"
        # ryba options
        YARN_REGISTRYDNS_OPTS: YARN_REGISTRYDNS_OPTS
      uid: options.user.name
      gid: options.hadoop_group.name
      mode: 0o0755
      backup: true
  @file.render
    header: 'Env'
    target: "#{options.conf_dir}/hadoop-env.sh"
    source: "#{__dirname}/../resources/hadoop-env.sh.j2"
    local: true
    context:
      HADOOP_LOG_DIR: options.log_dir
      HADOOP_PID_DIR: options.pid_dir
      java_home: options.java_home
    uid: options.user.name
    gid: options.hadoop_group.name
    mode: 0o750
    backup: true
    eof: true

Kerberos

  @krb5.addprinc options.krb5.admin,
    header: 'Kerberos'
    principal: options.krb5.principal.replace '_HOST', options.fqdn
    randkey: true
    keytab: options.krb5.keytab
    uid: options.user.name
    gid: options.hadoop_group.name

Kerberos JAAS

The JAAS file is used by the ResourceManager to initiate a secure connection with Zookeeper.

  @file.jaas
    header: 'Kerberos JAAS'
    target: "#{options.conf_dir}/yarn-registry.jaas"
    content: Client:
      principal: options.krb5.principal.replace '_HOST', options.fqdn
      keyTab: options.krb5.keytab
    uid: options.user.name
    gid: options.hadoop_group.name

## SSL

@call header: 'SSL', ->

@hconfigure

target: "#{options.conf_dir}/ssl-server.xml"

properties: options.ssl_server

@hconfigure

target: "#{options.conf_dir}/ssl-client.xml"

properties: options.ssl_client

# Client: import certificate to all hosts

@java.keystore_add

keystore: options.ssl_client['ssl.client.truststore.location']

storepass: options.ssl_client['ssl.client.truststore.password']

caname: "hadoop_root_ca"

cacert: options.ssl.cacert.source

local: options.ssl.cacert.local

# Server: import certificates, private and public keys to hosts with a server

@java.keystore_add

keystore: options.ssl_server['ssl.server.keystore.location']

storepass: options.ssl_server['ssl.server.keystore.password']

key: options.ssl.key.source

cert: options.ssl.cert.source

keypass: options.ssl_server['ssl.server.keystore.keypassword']

name: options.ssl.key.name

local: options.ssl.key.local

@java.keystore_add

keystore: options.ssl_server['ssl.server.keystore.location']

storepass: options.ssl_server['ssl.server.keystore.password']

caname: "hadoop_root_ca"

cacert: options.ssl.cacert.source

local: options.ssl.cacert.local

## Kerberos

Create the Kerberos service principal by default in the form of

"ats/{host}@{realm}" and place its keytab inside

"/etc/security/keytabs/ats.service.keytab" with ownerships set to

"mapred:hadoop" and permissions set to "0600".

@krb5.addprinc options.krb5.admin,

header: 'Kerberos'

principal: options.yarn_site['yarn.timeline-service.principal'].replace '_HOST', options.fqdn

randkey: true

keytab: options.yarn_site['yarn.timeline-service.keytab']

uid: options.user.name

gid: options.group.name

mode: 0o0600