# MapReduce JobHistoryServer(JHS)

The mapreduce job history server helps you to keep track about every job launched in the cluster.
Tje job history server gather information for all jobs launched on every distinct server and can be found ( once you kerbos ticket initiated) [here](http://master1.ryba:19888/jobhistory) for example
replace master2.ryba by the address of the server where the server is installed, or by its alias.
Now the jobHistory Server tends to be replace by the Yarn timeline server.


    module.exports =
      deps:
        iptables: module: 'masson/core/iptables', local: true
        krb5_client: module: 'masson/core/krb5_client', local: true
        java: module: 'masson/commons/java', local: true
        test_user: module: '@rybajs/metal/commons/test_user', local: true, auto: true
        hadoop_core: module: '@rybajs/metal/hadoop/core', local: true, auto: true, implicit: true
        hdfs_nn: module: '@rybajs/metal/hadoop/hdfs_nn', required: true
        hdfs_client: module: '@rybajs/metal/hadoop/hdfs_client', required: true
        mapred_jhs: module: '@rybajs/metal/hadoop/mapred_jhs'
        metrics: module: '@rybajs/metal/metrics', local: true
      configure:
        '@rybajs/metal/hadoop/mapred_jhs/configure'
      commands:
        'check':
          '@rybajs/metal/hadoop/mapred_jhs/check'
        'install': [
          '@rybajs/metal/hadoop/mapred_jhs/install'
          '@rybajs/metal/hadoop/mapred_jhs/start'
          '@rybajs/metal/hadoop/mapred_jhs/check'
        ]
        'start':
          '@rybajs/metal/hadoop/mapred_jhs/start'
        'status':
          '@rybajs/metal/hadoop/mapred_jhs/status'
        'stop':
          '@rybajs/metal/hadoop/mapred_jhs/stop'

[druid]: http://druid.io/docs/latest/configuration/hadoop.html
[amb-mr-site]: https://github.com/apache/ambari/blob/trunk/ambari-server/src/main/resources/stacks/HDP/2.3/services/YARN/configuration-mapred/mapred-site.xml