A sandbox can't interact with another sandbox.Network: A sandbox can't interact with any resource on the virtual machine (VM) or outside of it.Reaching the limit results in termination of the sandbox, and a query execution error.Memory: The maximum amount of RAM a sandbox can consume of its host's RAM is limited (default is 20GB).When the limit is reached, the sandbox's CPU use is throttled, but execution continues.CPU: The maximum rate of CPU a sandbox can consume of its host's processors is limited (default is 50%).This means that the first execution of a plugin that uses sandboxes on a node will include a short warm-up period.Otherwise, if set to true, sandboxes are initialized as part of service startup. ![]() Initialize on startup: if set to false (default), sandboxes are lazily initialized on a node, the first time a query requires a sandbox for its execution.Requests that are made when there's no available sandbox will be throttled.Number of sandboxes per node: The number of sandboxes per node is limited.Some of the parameters can be controlled using a cluster-level sandbox policy, for each kind of sandbox. New sandbox allocation could take up to 10-15 seconds per sandbox, depending on the SKU and available resources on the data node. If there are no pre-allocated sandboxes available to serve a query operator, it will be throttled until new sandboxes are available.Once a sandbox is used, a new one is automatically made available to replace it.Each node maintains a predefined number of sandboxes that are ready for running incoming requests.When a node is restarted, for example, as part of a service upgrade, all running sandboxes on it are disposed of.A sandbox is only used for a single query and is disposed of once that query completes.A sandboxed query operator may use one or more sandboxes for its execution.This affects the cluster's data capacity, and may affect the cost of the cluster.The estimated size is between 10-20 GB. ![]() The image for running the sandboxes is deployed to every cluster node and requires dedicated SSD space to run.Sandboxes that run on VM sizes not supporting nested virtualization are implemented using a proprietary legacy technology and are subject to some limitations.Sandboxes that run on VM sizes supporting nested virtualization are implemented using Hyper-V technology and have no limitations.Sandboxes are run locally (meaning, processing is done close to the data), with no extra latency for remote calls. ![]() Kusto can run sandboxes for specific flows that must be run in a secure and isolated environment.Įxamples of these flows are user-defined scripts that run using the Python plugin or the R plugin.
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