druid-docs-cn/development/extensions-contrib/cloudfiles.md

id	title
cloudfiles	Rackspace Cloud Files

To use this Apache Druid extension, make sure to include druid-cloudfiles-extensions extension.

Deep Storage

Rackspace Cloud Files is another option for deep storage. This requires some additional Druid configuration.

Property	Possible Values	Description	Default
druid.storage.type	cloudfiles		Must be set.
druid.storage.region		Rackspace Cloud Files region.	Must be set.
druid.storage.container		Rackspace Cloud Files container name.	Must be set.
druid.storage.basePath		Rackspace Cloud Files base path to use in the container.	Must be set.
druid.storage.operationMaxRetries		Number of tries before cancel a Rackspace operation.	10
druid.cloudfiles.userName		Rackspace Cloud username	Must be set.
druid.cloudfiles.apiKey		Rackspace Cloud API key.	Must be set.
druid.cloudfiles.provider	rackspace-cloudfiles-us,rackspace-cloudfiles-uk	Name of the provider depending on the region.	Must be set.
druid.cloudfiles.useServiceNet	true,false	Whether to use the internal service net.	true

Firehose

StaticCloudFilesFirehose

This firehose ingests events, similar to the StaticAzureBlobStoreFirehose, but from Rackspace's Cloud Files.

Data is newline delimited, with one JSON object per line and parsed as per the InputRowParser configuration.

The storage account is shared with the one used for Rackspace's Cloud Files deep storage functionality, but blobs can be in a different region and container.

As with the Azure blobstore, it is assumed to be gzipped if the extension ends in .gz

This firehose is splittable and can be used by native parallel index tasks. Since each split represents an object in this firehose, each worker task of index_parallel will read an object.

Sample spec:

"firehose" : {
    "type" : "static-cloudfiles",
    "blobs": [
        {
          "region": "DFW"
          "container": "container",
          "path": "/path/to/your/file.json"
        },
        {
          "region": "ORD"
          "container": "anothercontainer",
          "path": "/another/path.json"
        }
    ]
}

This firehose provides caching and prefetching features. In IndexTask, a firehose can be read twice if intervals or shardSpecs are not specified, and, in this case, caching can be useful. Prefetching is preferred when direct scan of objects is slow.

property	description	default	required?
type	This should be static-cloudfiles.	N/A	yes
blobs	JSON array of Cloud Files blobs.	N/A	yes
maxCacheCapacityBytes	Maximum size of the cache space in bytes. 0 means disabling cache.	1073741824	no
maxCacheCapacityBytes	Maximum size of the cache space in bytes. 0 means disabling cache. Cached files are not removed until the ingestion task completes.	1073741824	no
maxFetchCapacityBytes	Maximum size of the fetch space in bytes. 0 means disabling prefetch. Prefetched files are removed immediately once they are read.	1073741824	no
fetchTimeout	Timeout for fetching a Cloud Files object.	60000	no
maxFetchRetry	Maximum retry for fetching a Cloud Files object.	3	no

Cloud Files Blobs:

property	description	default	required?
container	Name of the Cloud Files container	N/A	yes
path	The path where data is located.	N/A	yes