Muokkaa

Jaa

Throughput (RU/s) operations with Azure CLI for a keyspace or table for Azure Cosmos DB - API for Cassandra

  • Artikkeli

APPLIES TO: Cassandra

The script in this article creates a Cassandra keyspace with shared throughput and a Cassandra table with dedicated throughput, then updates the throughput for both the keyspace and table. The script then migrates from standard to autoscale throughput then reads the value of the autoscale throughput after it has been migrated.

If you don't have an Azure subscription, create an Azure free account before you begin.

Prerequisites

  • This article requires Azure CLI version 2.12.1 or later. Run az --version to find the version. If you need to install or upgrade, see Install Azure CLI. If using Azure Cloud Shell, the latest version is already installed.

Sample script

Launch Azure Cloud Shell

The Azure Cloud Shell is a free interactive shell that you can use to run the steps in this article. It has common Azure tools preinstalled and configured to use with your account.

To open the Cloud Shell, just select Try it from the upper right corner of a code block. You can also launch Cloud Shell in a separate browser tab by going to https://shell.azure.com.

When Cloud Shell opens, verify that Bash is selected for your environment. Subsequent sessions will use Azure CLI in a Bash environment, Select Copy to copy the blocks of code, paste it into the Cloud Shell, and press Enter to run it.

Sign in to Azure

Cloud Shell is automatically authenticated under the initial account signed-in with. Use the following script to sign in using a different subscription, replacing <Subscription ID> with your Azure Subscription ID. If you don't have an Azure subscription, create an Azure free account before you begin.

subscription="<subscriptionId>" # add subscription here

az account set -s $subscription # ...or use 'az login'

For more information, see set active subscription or log in interactively

Run the script

# Throughput operations for a Cassandra keyspace and table

# Variable block
let "randomIdentifier=$RANDOM*$RANDOM"
location="East US"
resourceGroup="msdocs-cosmosdb-rg-$randomIdentifier"
tag="serverless-casandra-cosmosdb"
account="msdocs-account-cosmos-$randomIdentifier" #needs to be lower case
keySpace="keyspace1"
table="table1"
originalThroughput=400
updateThroughput=500

# Create a resource group
echo "Creating $resourceGroup in $location..."
az group create --name $resourceGroup --location "$location"

# Create a Cosmos account for Cassandra API
echo "Creating $account"
az cosmosdb create --name $account --resource-group $resourceGroup --capabilities EnableCassandra

# Create Cassandra keyspace
echo "Creating $keySpace with $originalThroughput"
az cosmosdb cassandra keyspace create --account-name $account --resource-group $resourceGroup --name $keySpace --throughput $originalThroughput

# Define the schema for the table
printf ' 
{
    "columns": [
        {"name": "columnA","type": "uuid"}, 
        {"name": "columnB","type": "text"}
    ],
    "partitionKeys": [{"name": "columnA"}]
}' > "schema-$randomIdentifier.json"

# Create the Cassandra table
echo "Creating $table with $originalThroughput"
az cosmosdb cassandra table create --account-name $account --resource-group $resourceGroup --keyspace-name $keySpace --name $table --throughput $originalThroughput --schema @schema-$randomIdentifier.json

# Clean up temporary schema file
rm -f "schema-$randomIdentifier.json"

# Throughput operations for Cassandra API keyspace
#   Read the current throughput
#   Read the minimum throughput
#   Make sure the updated throughput is not less than the minimum
#   Update the throughput
#   Migrate between standard (manual) and autoscale throughput
#   Read the autoscale max throughput

# Retrieve the current provisioned keyspace throughput
az cosmosdb cassandra keyspace throughput show --account-name $account --resource-group $resourceGroup --name $keySpace --query resource.throughput -o tsv

# Retrieve the minimum allowable keyspace throughput
minimumThroughput=$(az cosmosdb cassandra keyspace throughput show --account-name $account --resource-group $resourceGroup --name $keySpace --query resource.minimumThroughput -o tsv)

echo $minimumThroughput

# Make sure the updated throughput is not less than the minimum allowed throughput
if [ $updateThroughput -lt $minimumThroughput ]; then
    updateThroughput=$minimumThroughput
fi

# Update keyspace throughput
echo "Updating $keyspace throughput to $updateThroughput"
az cosmosdb cassandra keyspace throughput update --account-name $account --resource-group $resourceGroup --name $keySpace --throughput $updateThroughput

# Migrate the keyspace from standard (manual) throughput to autoscale throughput
az cosmosdb cassandra keyspace throughput migrate --account-name $account --resource-group $resourceGroup --name $keySpace --throughput-type "autoscale"

# Retrieve current autoscale provisioned max keyspace throughput
az cosmosdb cassandra keyspace throughput show --account-name $account --resource-group $resourceGroup --name $keySpace --query resource.autoscaleSettings.maxThroughput -o tsv

# Throughput operations for Cassandra API table
#   Read the current throughput
#   Read the minimum throughput
#   Make sure the updated throughput is not less than the minimum
#   Update the throughput
#   Migrate between standard (manual) and autoscale throughput
#   Read the autoscale max throughput

# Retrieve the current provisioned table throughput
az cosmosdb cassandra table throughput show --account-name $account --resource-group $resourceGroup --keyspace-name $keySpace --name $table --query resource.throughput -o tsv

# Retrieve the minimum allowable table throughput
minimumThroughput=$(az cosmosdb cassandra table throughput show --account-name $account --resource-group $resourceGroup --keyspace-name $keySpace --name $table --query resource.minimumThroughput -o tsv)
echo $minimumThroughput

# Make sure the updated throughput is not less than the minimum allowed throughput
if [ $updateThroughput -lt $minimumThroughput ]; then
    updateThroughput=$minimumThroughput
fi

# Update table throughput
echo "Updating $table throughput to $updateThroughput"
az cosmosdb cassandra table throughput update --account-name $account --resource-group $resourceGroup --keyspace-name $keySpace --name $table --throughput $updateThroughput

# Migrate the table from standard (manual) throughput to autoscale throughput
az cosmosdb cassandra table throughput migrate --account-name $account --resource-group $resourceGroup --keyspace-name $keySpace --name $table --throughput-type "autoscale"

# Retrieve the current autoscale provisioned max table throughput
az cosmosdb cassandra table throughput show --account-name $account --resource-group $resourceGroup --keyspace-name $keySpace --name $table --query resource.autoscaleSettings.maxThroughput -o tsv

Clean up resources

Use the following command to remove the resource group and all resources associated with it using the az group delete command - unless you have an ongoing need for these resources. Some of these resources may take a while to create, as well as to delete.

az group delete --name $resourceGroup

Sample reference

This script uses the following commands. Each command in the table links to command specific documentation.

Command Notes
az group create Creates a resource group in which all resources are stored.
az cosmosdb create Creates an Azure Cosmos DB account.
az cosmosdb cassandra keyspace create Creates an Azure Cosmos DB Cassandra keyspace.
az cosmosdb cassandra table create Creates an Azure Cosmos DB Cassandra table.
az cosmosdb cassandra keyspace throughput update Update RU/s for an Azure Cosmos DB Cassandra keyspace.
az cosmosdb cassandra table throughput update Update RU/s for an Azure Cosmos DB Cassandra table.
az cosmosdb cassandra keyspace throughput migrate Migrate throughput for an Azure Cosmos DB Cassandra keyspace.
az cosmosdb cassandra table throughput migrate Migrate throughput for an Azure Cosmos DB Cassandra table.
az group delete Deletes a resource group including all nested resources.

Next steps

For more information on the Azure Cosmos DB CLI, see Azure Cosmos DB CLI documentation.