why allocated v-core is always 0?

Question

why allocated v-core is always 0? how to change it?

Answer 1

Hi Yi Wang,

Thanks for reaching out to Microsoft Q&A.

Azure Synapse runs on Azure infrastructure that accrues costs along with Azure Synapse when you deploy the new resource. It's important to understand that additional infrastructure might accrue cost. If V-core is 0, there might be a possibility that you have exhausted the vcores

Please check below article to understand the cost :

https://learn.microsoft.com/en-us/azure/synapse-analytics/plan-manage-costs

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Answer 2

Hi @Yi Wang

Greetings & Welcome to the Microsoft Q&A forum! Thank you for sharing your query.

According to this documentation: Apache Spark in Azure Synapse Analytics Core Concepts

Every Azure Synapse workspace comes with a default quota of vCores that can be used for Spark. The quota is split between the user quota and the dataflow quota so that neither usage pattern uses up all the vCores in the workspace. The quota is different depending on the type of your subscription but is symmetrical between user and dataflow. However, if you request more vCores than are remaining in the workspace.

The vcores limit depends on the node size and the number of nodes. To solve this problem, you have to reduce your usage of the pool resources before submitting a new resource request by running a notebook or a job.

(or)

Please scale up the node size and the number of nodes.

To resolve this issue, you need to request a capacity increase via the Azure portal by creating a new support ticket.

Step1: Create a new support ticket and select issue type as Service and subscription limits (quotas) and quota type as Azure Synapse Analytics.

Step2: In the Details tab, click on Enter details and choose quota type as Apache Spark (vCore) per workspace , select workspace, and request quota as shown below.

Step3: Select support method and create the ticket.

Reference: https://learn.microsoft.com/en-us/answers/questions/1341177/azure-synapse-spark-job-issue

https://learn.microsoft.com/en-us/answers/questions/2114024/no-more-allocated-vcores-on-azure-for-students-sub

For more details, refer to Apache Spark in Azure Synapse Analytics Core Concepts.

Hope this helps. Do let us know if you have any further queries.

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