You can run Spark jobs on Alibaba Cloud Container Service for Kubernetes (ACK) and accelerate data access by using the Alluxio distributed cache. ACK provides Spark Operator to simplify the procedure of submitting Spark jobs. ACK also provides Spark History Server to record the historical data of Spark jobs. This simplifies problem troubleshooting. This topic describes how to set up a Spark runtime environment.

Background information

Create an ACK cluster

For more information about how to create an ACK cluster, see Create a cluster of ACK Managed Edition.
The cluster configurations are subject to the following considerations:
  • When you set the instance type of worker nodes, select Big Data Network Performance Enhanced, and then select ecs.d1ne.6xlarge. Set the number of worker nodes to 20.
  • Each worker node of the ecs.d1ne.6xlarge instance type has twelve 5 TB HDDs. Before you mount the HDDs, partition and format them. For more information, see Partition and format a data disk larger than 2 TiB.
  • After you partition and format the HDDs, mount them to the ACK cluster. Then, run the df -h command to query HDD information. Figure 1 shows an example of the command output.
  • The 12 file paths under the /mnt directory are used in the configuration file of Alluxio. ACK provides a simplified method to mount data disks. This method reduces your workload if the cluster has a large number of nodes. For more information, see Use LVM to manage local storage.
Figure 1. Mounted data disks
Mounted data disks

Create an OSS bucket

You must create an Object Storage Service (OSS) bucket to store data, including the test data generated by TPC-DS, test results, and test logs. The following examples are based on bucket cloudnativeai. For more information about how to create an OSS bucket, see Create buckets.

Install the ack-spark-operator add-on

The ack-spark-operator add-on simplifies the procedure of submitting Spark jobs to a cluster.

  1. Log on to the ACK console.
  2. In the left-side navigation pane, choose Marketplace > App Catalog.
  3. On the App Catalog page, click ack-spark-operator.
  4. On the App Catalog - ack-spark-operator page, find the Deploy section on the right, and click Create.

Install the ack-spark-history-server add-on

ACK Spark History Server generates event logs during the execution of the Spark job and provides a user interface to simplify troubleshooting.

When you create the ack-spark-history-server add-on, you must specify parameters related to the OSS bucket on the Parameters tab. The OSS bucket is used to store historical data of the Spark job. For more information about how to create the ack-spark-history-server add-on, see Install the ack-spark-operator add-on.

The following code block shows the parameters related to the OSS bucket:
  enableOSS: false
  # Please input your accessKeyId
  alibabaCloudAccessKeyId: ""
  # Please input your accessKeySecret
  alibabaCloudAccessKeySecret: ""
  # oss bucket endpoint such as
  alibabaCloudOSSEndpoint: ""
  # oss file path such as oss://bucket-name/path
  eventsDir: "oss://cloudnativeai/spark/spark-events"
Run the following command to check whether ack-spark-history-server is installed:
kubectl get service ack-spark-history-server -n {YOUR-NAMESPACE}

Install Alluxio

You must run the Helm command to install Alluxio on ACK.

  1. Run the following command to download the installation file of Alluxio:
    tar -xvf alluxio-0.6.8.tgz
  2. Create and configure the config.yaml file in the directory where the installation file of Alluxio is saved.

    For more information about how to configure the file, see config.yaml.

    The following list describes the key configurations:
    • Modify the following parameters based on the information of the OSS bucket: AccessKey ID, AccessKey secret, OSS server endpoint, and UNIX File System (UFS).
      # Site properties for all the components
        fs.oss.accessKeyId: YOUR-ACCESS-KEY-ID
        fs.oss.accessKeySecret: YOUR-ACCESS-KEY-SECRET
        alluxio.master.mount.table.root.ufs: oss://cloudnativeai/
        alluxio.master.persistence.blacklist: .staging,_temporary 365d
        alluxio.user.metrics.collection.enabled: 'true'
        alluxio.user.short.circuit.enabled: 'true'
        alluxio.user.file.write.tier.default: 1
        alluxio.user.block.size.bytes.default: 64MB #default 64MB
        alluxio.user.file.writetype.default: CACHE_THROUGH
        alluxio.user.file.metadata.load.type: ONCE
        alluxio.user.file.readtype.default: CACHE
        #alluxio.worker.allocator.class: alluxio.worker.block.allocator.MaxFreeAllocator
        alluxio.worker.allocator.class: alluxio.worker.block.allocator.RoundRobinAllocator
        alluxio.worker.file.buffer.size: 128MB
        alluxio.worker.evictor.class: alluxio.worker.block.evictor.LRUEvictor
        alluxio.job.master.client.threads: 5000
        alluxio.job.worker.threadpool.size: 300
    • In the tieredstore section, the values of mediumtype are the IDs of the data disks on a worker node, and the values of path are the paths where the data disks are mounted.
          - level: 0
            alias: HDD
            mediumtype: HDD-0,HDD-1,HDD-2,HDD-3,HDD-4,HDD-5,HDD-6,HDD-7,HDD-8,HDD-9,HDD-10,HDD-11
            path: /mnt/disk1,/mnt/disk2,/mnt/disk3,/mnt/disk4,/mnt/disk5,/mnt/disk6,/mnt/disk7,/mnt/disk8,/mnt/disk9,/mnt/disk10,/mnt/disk11,/mnt/disk12
            type: hostPath
            quota: 1024G,1024G,1024G,1024G,1024G,1024G,1024G,1024G,1024G,1024G,1024G,1024G
            high: 0.95
            low: 0.7
  3. Attach the alluxio=true tag to the worker nodes of the ACK cluster.
    For more information about how to attach tags, see Manage node labels.
  4. Run the following Helm command to install Alluxio:
    kubectl create namespace alluxio
    helm install -f config.yaml -n alluxio alluxio alluxio
  5. Run the following command to check whether Alluxio is installed:
    kubectl get pod -n alluxio
  6. Run the following command to log on to the primary node of Alluxio and check whether the disks are mounted to worker nodes of the cluster:
    kubectl exec -it alluxio-master-0 -n alluxio -- /bin/bash
    ./bin/alluxio fsadmin report capacity
    If disks are mounted to each worker node, Alluxio is installed.Alluxio

What to do next

Write test code