[/map {"- map/map "}) [/map/topicref {"- map/topicref "}) [/map/topicref/topicmeta {"- map/topicmeta "}) [/map/topicref/topicmeta/navtitle {"- topic/navtitle "}) Introduction (navtitle][/map/topicref/topicmeta/linktext {"- map/linktext "}) Introduction (linktext][/map/topicref/topicmeta/shortdesc {"- map/shortdesc "}) This section lists administrative tasks and tools that you can use to do these tasks. It also lists all Big Data Discovery logs, and describes the backup strategy. (shortdesc] (topicmeta][/map/topicref/topicref {"- map/topicref "}) [/map/topicref/topicref/topicmeta {"- map/topicmeta "}) [/map/topicref/topicref/topicmeta/navtitle {"- topic/navtitle "}) List of administrative tasks (navtitle][/map/topicref/topicref/topicmeta/linktext {"- map/linktext "}) List of administrative tasks (linktext][/map/topicref/topicref/topicmeta/shortdesc {"- map/shortdesc "}) This topic lists top-level administrator tasks for Studio, the Dgraph, the Dgraph HDFS Agent and the Dgraph Gateway. (shortdesc] (topicmeta] (topicref][/map/topicref/topicref {"- map/topicref "}) [/map/topicref/topicref/topicmeta {"- map/topicmeta "}) [/map/topicref/topicref/topicmeta/navtitle {"- topic/navtitle "}) Administrative tools (navtitle][/map/topicref/topicref/topicmeta/linktext {"- map/linktext "}) Administrative tools (linktext][/map/topicref/topicref/topicmeta/shortdesc {"- map/shortdesc "}) Two tools for administering Big Data Discovery exist — the Enterprise Manager plug-in, and the `bdd-admin` script. This topic introduces these administrative tools and discusses when to use each. (shortdesc] (topicmeta] (topicref][/map/topicref/topicref {"- map/topicref "}) [/map/topicref/topicref/topicmeta {"- map/topicmeta "}) [/map/topicref/topicref/topicmeta/navtitle {"- topic/navtitle "}) List of Big Data Discovery logs (navtitle][/map/topicref/topicref/topicmeta/linktext {"- map/linktext "}) List of Big Data Discovery logs (linktext][/map/topicref/topicref/topicmeta/shortdesc {"- map/shortdesc "}) This topic provides a list of all the logs generated by a BDD deployment. It also has a summary of where to find logs for each BDD component, and tells you how to access logs. (shortdesc] (topicmeta] (topicref][/map/topicref/topicref {"- map/topicref "}) [/map/topicref/topicref/topicmeta {"- map/topicmeta "}) [/map/topicref/topicref/topicmeta/navtitle {"- topic/navtitle "}) Big Data Discovery backup strategy (navtitle][/map/topicref/topicref/topicmeta/linktext {"- map/linktext "}) Big Data Discovery backup strategy (linktext][/map/topicref/topicref/topicmeta/shortdesc {"- map/shortdesc "}) Oracle recommends that you back up your system to ensure the safety of your data. This topic lists the resources you should back up, as well as their locations. (shortdesc] (topicmeta] (topicref] (topicref][/map/topicref {"- map/topicref "}) [/map/topicref/topicmeta {"- map/topicmeta "}) [/map/topicref/topicmeta/navtitle {"- topic/navtitle "}) Cluster Architecture (navtitle][/map/topicref/topicmeta/linktext {"- map/linktext "}) Cluster Architecture (linktext][/map/topicref/topicmeta/shortdesc {"- map/shortdesc "}) This section describes the architecture of a Big Data Discovery cluster. (shortdesc] (topicmeta][/map/topicref/topicref {"- map/topicref "}) [/map/topicref/topicref/topicmeta {"- map/topicmeta "}) [/map/topicref/topicref/topicmeta/navtitle {"- topic/navtitle "}) Cluster components (navtitle][/map/topicref/topicref/topicmeta/linktext {"- map/linktext "}) Cluster components (linktext][/map/topicref/topicref/topicmeta/shortdesc {"- map/shortdesc "}) A Big Data Discovery cluster is a deployment of Big Data Discovery on multiple machines. Such a deployment can be made up of any number of nodes — you determine the number of nodes at deployment time. (shortdesc] (topicmeta][/map/topicref/topicref/topicref {"- map/topicref "}) [/map/topicref/topicref/topicref/topicmeta {"- map/topicmeta "}) [/map/topicref/topicref/topicref/topicmeta/navtitle {"- topic/navtitle "}) About a BDD cluster, nodes, and deployments (navtitle][/map/topicref/topicref/topicref/topicmeta/linktext {"- map/linktext "}) About a BDD cluster, nodes, and deployments (linktext][/map/topicref/topicref/topicref/topicmeta/shortdesc {"- map/shortdesc "}) This topic provides an overview of the components in a Big Data Discovery cluster. (shortdesc] (topicmeta] (topicref][/map/topicref/topicref/topicref {"- map/topicref "}) [/map/topicref/topicref/topicref/topicmeta {"- map/topicmeta "}) [/map/topicref/topicref/topicref/topicmeta/navtitle {"- topic/navtitle "}) Diagram of a Big Data Discovery Cluster (navtitle][/map/topicref/topicref/topicref/topicmeta/linktext {"- map/linktext "}) Diagram of a Big Data Discovery Cluster (linktext][/map/topicref/topicref/topicref/topicmeta/shortdesc {"- map/shortdesc "}) This diagram illustrates a cluster of Big Data Discovery nodes deployed on top of an existing CDH cluster. (shortdesc] (topicmeta] (topicref][/map/topicref/topicref/topicref {"- map/topicref "}) [/map/topicref/topicref/topicref/topicmeta {"- map/topicmeta "}) [/map/topicref/topicref/topicref/topicmeta/navtitle {"- topic/navtitle "}) Cluster of Dgraph nodes (navtitle][/map/topicref/topicref/topicref/topicmeta/linktext {"- map/linktext "}) Cluster of Dgraph nodes (linktext][/map/topicref/topicref/topicref/topicmeta/shortdesc {"- map/shortdesc "}) A typical BDD cluster deployment includes a set of machines that are solely dedicated to running the Dgraph. This set of machines is known as the Dgraph cluster. (shortdesc] (topicmeta] (topicref][/map/topicref/topicref/topicref {"- map/topicref "}) [/map/topicref/topicref/topicref/topicmeta {"- map/topicmeta "}) [/map/topicref/topicref/topicref/topicmeta/navtitle {"- topic/navtitle "}) Leader and follower Dgraph nodes (navtitle][/map/topicref/topicref/topicref/topicmeta/linktext {"- map/linktext "}) Leader and follower Dgraph nodes (linktext][/map/topicref/topicref/topicref/topicmeta/shortdesc {"- map/shortdesc "}) This topic introduces the terms used to describe Dgraphs — the leader and follower nodes. (shortdesc] (topicmeta] (topicref] (topicref][/map/topicref/topicref {"- map/topicref "}) [/map/topicref/topicref/topicmeta {"- map/topicmeta "}) [/map/topicref/topicref/topicmeta/navtitle {"- topic/navtitle "}) Cluster behavior (navtitle][/map/topicref/topicref/topicmeta/linktext {"- map/linktext "}) Cluster behavior (linktext][/map/topicref/topicref/topicmeta/shortdesc {"- map/shortdesc "}) Many scenarios of Big Data Discovery deployment clusters are possible. This section describes how the BDD cluster behaves and maintains enhanced availability in various scenarios, such as during node startup, updates to the indexes, or individual node failures. (shortdesc] (topicmeta][/map/topicref/topicref/topicref {"- map/topicref "}) [/map/topicref/topicref/topicref/topicmeta {"- map/topicmeta "}) [/map/topicref/topicref/topicref/topicmeta/navtitle {"- topic/navtitle "}) Load balancing and routing of requests (navtitle][/map/topicref/topicref/topicref/topicmeta/linktext {"- map/linktext "}) Load balancing and routing of requests (linktext][/map/topicref/topicref/topicref/topicmeta/shortdesc {"- map/shortdesc "}) This topic discusses the load balancing and routing of requests from Studio nodes to the Dgraph nodes in Oracle Big Data Discovery. (shortdesc] (topicmeta] (topicref][/map/topicref/topicref/topicref {"- map/topicref "}) [/map/topicref/topicref/topicref/topicmeta {"- map/topicmeta "}) [/map/topicref/topicref/topicref/topicmeta/navtitle {"- topic/navtitle "}) How session affinity is used (navtitle][/map/topicref/topicref/topicref/topicmeta/linktext {"- map/linktext "}) How session affinity is used (linktext][/map/topicref/topicref/topicref/topicmeta/shortdesc {"- map/shortdesc "}) When a WebLogic Server node hosting Studio and Dgraph Gateway receives a client request, it routes the request to a Dgraph node using session affinity, based on the session ID specified in the header of the request. (shortdesc] (topicmeta] (topicref][/map/topicref/topicref/topicref {"- map/topicref "}) [/map/topicref/topicref/topicref/topicmeta {"- map/topicmeta "}) [/map/topicref/topicref/topicref/topicmeta/navtitle {"- topic/navtitle "}) Startup of Dgraph nodes (navtitle][/map/topicref/topicref/topicref/topicmeta/linktext {"- map/linktext "}) Startup of Dgraph nodes (linktext][/map/topicref/topicref/topicref/topicmeta/shortdesc {"- map/shortdesc "}) Once the Big Data Discovery cluster is started, it activates the Dgraph processes on a subset of the nodes that are hosting the Dgraph instances. This topic discusses the behavior of the Dgraph nodes at startup. (shortdesc] (topicmeta] (topicref][/map/topicref/topicref/topicref {"- map/topicref "}) [/map/topicref/topicref/topicref/topicmeta {"- map/topicmeta "}) [/map/topicref/topicref/topicref/topicmeta/navtitle {"- topic/navtitle "}) How updates are processed (navtitle][/map/topicref/topicref/topicref/topicmeta/linktext {"- map/linktext "}) How updates are processed (linktext][/map/topicref/topicref/topicref/topicmeta/shortdesc {"- map/shortdesc "}) In a Dgraph cluster (it is part of the BDD cluster deployment), updates to the records in the indexes and updates to the configuration are routed to the leader Dgraph node. (shortdesc] (topicmeta] (topicref][/map/topicref/topicref/topicref {"- map/topicref "}) [/map/topicref/topicref/topicref/topicmeta {"- map/topicmeta "}) [/map/topicref/topicref/topicref/topicmeta/navtitle {"- topic/navtitle "}) Role of ZooKeeper (navtitle][/map/topicref/topicref/topicref/topicmeta/linktext {"- map/linktext "}) Role of ZooKeeper (linktext][/map/topicref/topicref/topicref/topicmeta/shortdesc {"- map/shortdesc "}) The ZooKeeper utility provides configuration and state management and distributed coordination services to Dgraph nodes of the Big Data Discovery cluster. It ensures high availability of the query processing by the Dgraph nodes in the cluster. (shortdesc] (topicmeta] (topicref][/map/topicref/topicref/topicref {"- map/topicref "}) [/map/topicref/topicref/topicref/topicmeta {"- map/topicmeta "}) [/map/topicref/topicref/topicref/topicmeta/navtitle {"- topic/navtitle "}) How enhanced availability is achieved (navtitle][/map/topicref/topicref/topicref/topicmeta/linktext {"- map/linktext "}) How enhanced availability is achieved (linktext][/map/topicref/topicref/topicref/topicmeta/shortdesc {"- map/shortdesc "}) This topic discusses how the BDD cluster deployment ensures enhanced availability of query-processing. (shortdesc] (topicmeta] (topicref] (topicref] (topicref] (map]