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arena allows to mount multiple data volumes into the training jobs. There is an example that mounts data volume into the training job.

  1. You need to create /data in the NFS Server, and prepare mnist data
# mkdir -p /nfs
# mount -t nfs -o vers=4.0 NFS_SERVER_IP:/ /nfs
# mkdir -p /data
# cd /data
# wget https://raw.githubusercontent.com/cheyang/tensorflow-sample-code/master/data/t10k-images-idx3-ubyte.gz
# wget https://raw.githubusercontent.com/cheyang/tensorflow-sample-code/master/data/t10k-labels-idx1-ubyte.gz
# wget https://raw.githubusercontent.com/cheyang/tensorflow-sample-code/master/data/train-images-idx3-ubyte.gz
# wget https://raw.githubusercontent.com/cheyang/tensorflow-sample-code/master/data/train-labels-idx1-ubyte.gz
# cd /
# umount /nfs

2. Create Persistent Volume. Moidfy NFS_SERVER_IP to yours.

# cat nfs-pv.yaml
apiVersion: v1
kind: PersistentVolume
metadata:
  name: tfdata
  labels:
    tfdata: nas-mnist
spec:
  persistentVolumeReclaimPolicy: Retain
  capacity:
    storage: 10Gi
  accessModes:
  - ReadWriteMany
  nfs:
    server: NFS_SERVER_IP
    path: "/data"
    
 # kubectl create -f nfs-pv.yaml

3. Create Persistent Volume Claim.

# cat nfs-pvc.yaml
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: tfdata
  annotations:
    description: "this is the mnist demo"
    owner: Tom
spec:
  accessModes:
    - ReadWriteMany
  resources:
    requests:
       storage: 5Gi
  selector:
    matchLabels:
      tfdata: nas-mnist
# kubectl create -f nfs-pvc.yaml

Notice: suggest to add description and owner

4. Check the data volume

# arena data list 
NAME    ACCESSMODE     DESCRIPTION             OWNER   AGE
tfdata  ReadWriteMany  this is for mnist demo  myteam  43d

5. Now we can submit a distributed training job with arena, it will download the source code from github and mount data volume tfdata to /mnist_data.

# arena submit tf --name=tf-dist-data         \
              --gpus=1              \
              --workers=2              \
              --workerImage=tensorflow/tensorflow:1.5.0-devel-gpu  \
              --syncMode=git \
              --syncSource=https://github.com/cheyang/tensorflow-sample-code.git \
              --ps=1              \
              --psImage=tensorflow/tensorflow:1.5.0-devel   \
              --tensorboard \
              --data=tfdata:/mnist_data \
              "python code/tensorflow-sample-code/tfjob/docker/v1alpha2/distributed-mnist/main.py --logdir /training_logs --data_dir /mnist_data"

--data specifies the data volume to mount to all the tasks of the job, like <name_of_datasource>:<mount_point_on_job>. In this example, the data volume is tfdata, and the target directory is /mnist_data.

6. From the logs, we find that the training data is extracted from /mnist_data instead of downloading from internet directly.

# arena logs tf-dist-data
...
Extracting /mnist_data/train-images-idx3-ubyte.gz
Extracting /mnist_data/train-labels-idx1-ubyte.gz
Extracting /mnist_data/t10k-images-idx3-ubyte.gz
Extracting /mnist_data/t10k-labels-idx1-ubyte.gz
...
Accuracy at step 960: 0.9753
Accuracy at step 970: 0.9739
Accuracy at step 980: 0.9756
Accuracy at step 990: 0.9777
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