Swap Management

NiFi keeps FlowFile information in memory (the JVM) but during surges of incoming data, the FlowFile information can start to take up so much of the JVM that system performance suffers. To counteract this effect, NiFi "swaps" the FlowFile information to disk temporarily until more JVM space becomes available again. These properties govern how that process occurs.


Property	Description
`nifi.swap.manager.implementation`	The Swap Manager implementation. The default value is `org.apache.nifi.controller.FileSystemSwapManager`. There is an alternate implementation, `EncryptedFileSystemSwapManager`, that encrypts the swap file content on disk. The encryption key configured for the FlowFile repository is used to perform the encryption, using the AES-GCM algorithm.
`nifi.queue.swap.threshold`	The queue threshold at which NiFi starts to swap FlowFile information to disk. The default value is `20000`.