druid/docs/content/Plumber.md

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Druid Plumbers

The Plumber is the thing that handles generated segments both while they are being generated and when they are "done". This is also technically a pluggable interface and there are multiple implementations, but there are a lot of details handled by the plumber such that it is expected that there will only be a few implementations and only more advanced third-parties will implement their own.

Field	Type	Description	Required
type	String	Specifies the type of plumber. Each value will have its own configuration schema, plumbers packaged with Druid are described below.	yes

We provide a brief description of the example to exemplify the types of things that are configured on the plumber.

• windowPeriod is the amount of lag time to allow events. This is configured with a 10 minute window, meaning that any event more than 10 minutes ago will be thrown away and not included in the segment generated by the realtime server.
• basePersistDirectory is the directory to put things that need persistence. The plumber is responsible for the actual intermediate persists and this tells it where to store those persists.
• maxPendingPersists is how many persists a plumber can do concurrently without starting to block.

Available Plumbers

YeOldePlumber

This plumber creates single historical segments.

RealtimePlumber

This plumber creates real-time/mutable segments.