File System Content Repository Properties


Property	Description
`nifi.content.repository.implementation`	The Content Repository implementation. The default value is `org.apache.nifi.controller.repository.FileSystemRepository` and should only be changed with caution. To store flowfile content in memory instead of on disk (at the risk of data loss in the event of power/machine failure), set this property to `org.apache.nifi.controller.repository.VolatileContentRepository`.
`nifi.content.claim.max.appendable.size`	The maximum size for a content claim. The default value is `1 MB`.
`nifi.content.claim.max.flow.files`	The max amount of claims to keep open for writing. The default value is `100`
`nifi.content.repository.directory.default`*	The location of the Content Repository. The default value is `./content_repository`. + NOTE: Multiple content repositories can be specified by using the `nifi.content.repository.directory.` prefix with unique suffixes and separate paths as values. + For example, to provide two additional locations to act as part of the content repository, a user could also specify additional properties with keys of: + `nifi.content.repository.directory.content1=/repos/content1` `nifi.content.repository.directory.content2=/repos/content2` + Providing three total locations, including `nifi.content.repository.directory.default`.
`nifi.content.repository.archive.max.retention.period`	If archiving is enabled (see `nifi.content.repository.archive.enabled` below), then this property specifies the maximum amount of time to keep the archived data. The default value is `12 hours`.
`nifi.content.repository.archive.max.usage.percentage`	If archiving is enabled (see `nifi.content.repository.archive.enabled` below), then this property must have a value that indicates the content repository disk usage percentage at which archived data begins to be removed. If the archive is empty and content repository disk usage is above this percentage, then archiving is temporarily disabled. Archiving will resume when disk usage is below this percentage. The default value is `50%`.
`nifi.content.repository.archive.backpressure.percentage`	This property is used to control the content repository disk usage percentage at which backpressure is applied to the processes writing to the content repository. Once this percentage is reached, the content repository will refuse any additional writes. Writes will be refused until the archive delete process has brought the content repository disk usage percentage below `nifi.content.repository.archive.max.usage.percentage`. The value must be a valid percentage e.g. `60%` For example, if `nifi.content.repository.archive.max.usage.percentage` is `50%` and `nifi.content.repository.archive.backpressure.percentage` is `60%`, then if the content repository reaches 60% utilisation of storage capacity, all further writes are blocked until utilisation is brought back down to 50%. When not set, the default value is derived as 2% greater than `nifi.content.repository.archive.max.usage.percentage`. For example, if `nifi.content.repository.archive.max.usage.percentage` is `50%` and `nifi.content.repository.archive.backpressure.percentage` is not set, the effective value of `nifi.content.repository.archive.backpressure.percentage` will be `52%`.
`nifi.content.repository.archive.enabled`	To enable content archiving, set this to `true` and specify a value for the `nifi.content.repository.archive.max.usage.percentage` property above. Content archiving enables the provenance UI to view or replay content that is no longer in a dataflow queue. By default, archiving is enabled.
`nifi.content.repository.always.sync`	If set to `true`, any change to the repository will be synchronized to the disk, meaning that NiFi will ask the operating system not to cache the information. This is very expensive and can significantly reduce NiFi performance. However, if it is `false`, there could be the potential for data loss if either there is a sudden power loss or the operating system crashes. The default value is `false`.
`nifi.content.viewer.url`	The URL for a web-based content viewer if one is available. It is blank by default.
`nifi.content.repository.archive.cleanup.frequency`	The frequency with which to schedule the content archive clean up task. The default value is `1 Second`. A value lower than `1 Second` is not allowed.