What are the limits for Cloud Big Data?


All accounts, by default, have a preconfigured set of thresholds (or limits) to manage capacity and prevent abuse of the system. The system recognizes rate limits and absolute limits. Rate limits are thresholds that are reset after a certain amount of time passes. Absolute limits are fixed.

Rate limits

Rate limits are specified in both a human-readable wildcard URI and a machine-processable regular expression. The regular expression boundary matcher ^ takes effect after the root URI path. For example, the regular expression ^/v1.0/clusters would match the bold portion of the following URL: https://dfw.bigdata.api.rackspacecloud.com/v1.0/clusters

The following table specifies the default rate limits for all GET, POST, PUT, and DELETE API operations for clusters.

Verb URI Regular expression Default
GET changes-since */clusters/* ^/vd+.d+/clusters.* 3 per minute
POST */clusters/* ^/vd+.d+/clusters.* 2 per minute
POST clusters */clusters/* ^/vd+.d+/clusters.* 50 per day
PUT */clusters/* ^/vd+.d+/clusters.* 2 per minute
DELETE */clusters/* ^/vd+.d+/clusters.* 5 per minute

Rate limits are applied in order relative to the verb, going from least to most specific. For example, although the threshold for issuing a POST request to /v1.0/* is 2 per minute, you cannot issue a POST request to /v1.0/* more than 50 times within a single day.

If you exceed the thresholds established for your account, a 413 (OverLimit) HTTP response is returned with a Retry-After header to notify the client when it can attempt to try again.

 

Absolute limits

The following table describes the absolute limits that are set.

Name Description Limit
Node Count Maximum number of allowed data notes 5
Disk Maximum disk capacity across all data nodes, in gigabytes (GB) 5120
RAM Maximum RAM across all data notes, in gigabytes (GB) 40960
VCPUs Maximum virtual CPUs across all data nodes 10

 



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