Merge "[IDH] Initial documentation for IDH plugin"
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userdoc/plugins
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userdoc/vanilla_plugin
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userdoc/hdp_plugin
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userdoc/idh_plugin
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**Elastic Data Processing**
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doc/source/userdoc/idh_plugin.rst
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doc/source/userdoc/idh_plugin.rst
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Intel Distribution for Apache Hadoop Plugin
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===========================================
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The Intel Distribution for Apache Hadoop (IDH) Sahara plugin provides a way
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to provision IDH clusters on OpenStack using templates in a single click and
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in an easily repeatable fashion. The Sahara controller serves as the glue
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between Hadoop and OpenStack. The IDH plugin mediates between the Sahara
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controller and Intel Manager in order to deploy and configure Hadoop on
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OpenStack. Intel Manager is used as the orchestrator for deploying the IDH
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stack on OpenStack.
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For cluster provisioning images supporting cloud init should be used. The only
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supported operation system for now is Cent OS 6.4. Here you can find the image:
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* http://sahara-files.mirantis.com/CentOS-6.4-cloud-init.qcow2
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IDH plugin requires an image to be tagged in Sahara Image Registry with
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two tags: 'idh' and '<IDH version>' (e.g. '2.5.1').
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Also you should specify a default username of "cloud-user" to be used in the
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Image.
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Limitations
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-----------
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The IDH plugin currently has the following limitations:
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* IDH plugin downloads the Intel Manager package from a URL provided in the
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cluster configuration. A local HTTP mirror should be used in cases where the
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VMs do not have access to the Internet or have port limitations.
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* IDH plugin adds the Intel rpm repository to the yum configuration. The
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repository URL can be chosen during Sahara cluster configuration. A local
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mirror should be used in cases where the VMs have no access to the Internet
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or have port limitations. Refer to the IDH documentation for instructions on
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how to create a local mirror.
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* Hadoop cluster scaling is supported only for datanode and tasktracker
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(nodemanager for IDH 3.x) processes.
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Cluster Validation
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------------------
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When a user creates or scales a Hadoop cluster using the IDH plugin, the
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cluster topology requested by the user is verified for consistency.
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Currently there are the following limitations in cluster topology for IDH plugin:
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* Cluster should contain
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* exactly one manager
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* exactly one namenode
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* at most one jobtracker for IDH 2.x or resourcemanager for IDH 3.x
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* at most one oozie
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* Cluster cannot be created if it contains worker processes without containing
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corresponding master processes. E.g. it cannot contain tasktracker if there
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is no jobtracker.
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