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Incorrect indent Sahara Installation Guide in sahara cause wrong front format. Closes-Bug:#1729530 Change-Id: I419cd7dbcf9d7f7dadda5d4c7ebf75af64ef2081
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Vanilla Plugin
The vanilla plugin is a reference implementation which allows users to operate a cluster with Apache Hadoop.
Since the Newton release Spark is integrated into the Vanilla plugin so you can launch Spark jobs on a Vanilla cluster.
For cluster provisioning prepared images should be used. They already have Apache Hadoop 2.7.1 installed.
You may build images by yourself using vanilla-imagebuilder or you could download prepared
images from http://sahara-files.mirantis.com/images/upstream
Vanilla plugin requires an image to be tagged in Sahara Image Registry with two tags: 'vanilla' and '<hadoop version>' (e.g. '2.7.1').
The default username specified for these images is different for each distribution:
| OS | username |
|---|---|
| Ubuntu 14 | ubuntu |
| Fedora 20 | fedora |
| CentOS 6 | cloud-user |
| CentOS 7 | centos |
Cluster Validation
When user creates or scales a Hadoop cluster using a Vanilla plugin, the cluster topology requested by user is verified for consistency.
Currently there are the following limitations in cluster topology for Vanilla plugin:
For Vanilla Hadoop version 2.x.x:
- Cluster must contain exactly one namenode
- Cluster can contain at most one resourcemanager
- Cluster can contain at most one secondary namenode
- Cluster can contain at most one historyserver
- Cluster can contain at most one oozie and this process is also required for EDP
- Cluster can't contain oozie without resourcemanager and without historyserver
- Cluster can't have nodemanager nodes if it doesn't have resourcemanager
- Cluster can have at most one hiveserver node.
- Cluster can have at most one spark history server and this process is also required for Spark EDP (Spark is available since the Newton release).