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This page contains guides related to importing data from Apache Kafka using stream ingestion.
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This section contains a collection of short guides to show you how to import from a Pinot supported file system.
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This section contains a collection of guides that will show you how to import data from a Pinot supported input format.
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This section contains articles that provide technical and implementation details of Pinot features
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Here you will find a collection of ready-made sample applications and examples for real-world data
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The Pinot Controller is responsible for a number of things
Controllers maintain the global metadata (e.g. configs and schemas) of the system with the help of Zookeeper which is used as the persistent metadata store.
Controllers host Helix Controller and is responsible for managing other pinot components (brokers, servers, minions)
They maintain the mapping of which servers are responsible for which segments. This mapping is used by the servers, to download the portion of the segments that they are responsible for. This mapping is also used by the broker to decide which servers to route the queries to.
Controller has admin endpoints for viewing, creating, updating and deleting configs which help us manage and operate the cluster.
Controllers also have endpoints for segment uploads which are used in offline data pushes. They are responsible for initializing realtime consumption and coordination of persisting the realtime segments into the segment store periodically.
They undertake other management activities such as managing retention of segments, validations.
There can be multiple instances of Pinot controller for redundancy. If there are multiple controllers, Pinot expects that all of them are configured with the same back-end storage system so that they have a common view of the segments (e.g. NFS). Pinot can use other storage systems such as HDFS or ADLS.
Make sure you've setup Zookeeper. If you're using docker, make sure to pull the pinot docker image. To start a controller
Cluster is a set a nodes comprising of servers, brokers, controllers and minions.
Briefly, Helix divides nodes into three logical components based on their responsibilities
The nodes that host distributed, partitioned resources
The nodes that observe the current state of each Participant and use that information to access the resources. Spectators are notified of state changes in the cluster (state of a participant, or that of a partition in a participant).
The node that observes and controls the Participant nodes. It is responsible for coordinating all transitions in the cluster and ensuring that state constraints are satisfied while maintaining cluster stability.
To setup a Pinot cluster, we need to first start Zookeeper.
Once we've started Zookeeper, we can start other components to join this cluster. If you're using docker, pull the latest apachepinot/pinot
image.
To start other components to join the cluster
Pinot Minion is a new component which leverages the . It can be attached to an existing Pinot cluster and then execute tasks as provided by the controller. It's a generic and single place for running background jobs. They help offload computationally intensive tasks—such as adding indexes to segments and merging segments—from other components.
Pinot leverages for cluster management. Helix is a cluster management framework to manage replicated, partitioned resources in a distributed system. Helix uses Zookeeper to store cluster state and metadata.
Pinot Servers are modeled as Participants, more details about server nodes can be found in . Pinot Brokers are modeled as Spectators, more details about broker nodes can be found in . Pinot Controllers are modeled as Controllers, more details about controller nodes can be found in .
Another way to visualize the cluster is a logical view, wherein a cluster contains , tenants contain , and tables contain .
Typically, there is only cluster per environment/data center. There is no needed to create multiple Pinot clusters since Pinot supports the concept of . At LinkedIn, the largest Pinot cluster consists of 1000+ nodes.
Start to browse Zookeeper data at .
Download Pinot Distribution using instructions in
Install to view the data in Zookeeper, and connect to localhost:2181
(Optional) You can also follow the instructions to build your own images.
Explore your cluster via