update data_warm_up's document

docs/en/samples/data_warmup.md

@@ -99,7 +99,7 @@ EOF
 ```
 
 `spec.dataset` specifies the target dataset that needs to be preloaded. In this example, our target is the Dataset named `spark` under the `default` namespace. 
-Feel free to change the configuration above if it doesn't match your actual environment
+Feel free to change the configuration above if it doesn't match your actual environment. ** note ** The namespace of your DataLoad must be consistent with the namespace of your dataset.
 
 **By default, it'll preload all the data in the target dataset**. If you'd like to controll the data preloading behaviors in a more find-grained way(e.g. preload data under some specified path only),
 please refer to [DataLoad Advanced Configurations](#dataload-advanced-configurations)

docs/en/samples/s3_configuration.md

@@ -0,0 +1,85 @@
+## DEMO - The special configurations required for Fluid access AWS S3
+
+If AWS S3 is selected as the underlying storage system of Alluxio, additional configuration is required for Alluxio to properly access the mounted S3 storage system.
+
+This document shows how to do the special configuration required for Alluxio in Fluid in a declarative manner. For more information, see [Configuring Alluxio on Amazon AWS S3](https://docs.alluxio.io/os/user/stable/en/ufs/S3.html).
+
+## Prerequisites
+
+- [Fluid](https://github.com/fluid-cloudnative/fluid)
+- The S3 bucket has been configured and the AWS certificate that has permission to access the bucket.
+
+Please refer to the[Fluid installation documentation](https://github.com/fluid-cloudnative/fluid/blob/master/docs/zh/userguide/install.md) to complete the installation.
+
+## Run the example
+
+For security, Fluid recommends using Secret to configure sensitive information such as`aws.accessKeyId` and `aws.secretKey`。For more information about Secret's use in Fluid, see[Use Secret to configure sensitive Dataset information](https://github.com/fluid-cloudnative/fluid/blob/master/docs/en/samples/use_encryptoptions.md)
+
+**Create Dataset Resource Object**
+
+```yaml
+$ cat << EOF > dataset.yaml
+apiVersion: data.fluid.io/v1alpha1
+kind: Dataset
+metadata:
+  name: my-s3
+spec:
+  mounts:
+    - mountPoint: s3://<bucket-name>/<path-to-data>/
+      name: s3
+      options:
+        alluxio.underfs.s3.region: <s3-bucket-region>
+        alluxio.underfs.s3.endpoint: <s3-endpoint>
+        encryptOptions:
+        - name: aws.accessKeyId
+          valueFrom:
+            secretKeyRef:
+              name: mysecret
+              key: aws.accessKeyId
+        - name: aws.secretKey
+          valueFrom:
+            secretKeyRef:
+              name: mysecret
+              key: aws.secretKey
+EOF
+```
+Note: For object storage of different cloud vendors, the region configuration must be replaced with`alluxio.underfs.s3.endpoint.region=<S3_ENDPOINT_REGION>`,For details, see [Configuring Alluxio on Amazon AWS S3](https://docs.alluxio.io/os/user/stable/en/ufs/S3.html)
+
+```
+$ kubectl create -f dataset.yaml
+```
+
+**Create Secret**
+
+In the Secret to be created, specify the sensitive information that needs to be configured when the Dataset is created above.
+
+```yaml
+$ cat<<EOF >mysecret.yaml
+apiVersion: v1
+kind: Secret
+metadata:
+  name: mysecret
+stringData:
+  aws.accessKeyId: <AWS_ACESS_KEY_ID>
+  aws.secretKey: <AWS_SECRET_KEY>
+EOF
+```
+
+**Create AlluxioRuntime Resource Object**
+
+```yaml
+$ cat << EOF > runtime.yaml
+apiVersion: data.fluid.io/v1alpha1
+kind: AlluxioRuntime
+metadata:
+  name: my-s3
+spec:
+  ...
+EOF
+```
+
+```
+$ kubectl create -f runtime.yaml
+```
+
+The bucket specified in 'dataset.yaml' will be mounted to the '/s3' directory in Alluxio.

docs/zh/samples/data_warmup.md

@@ -93,7 +93,7 @@ spec:
 EOF
 ```
 
-`spec.dataset`指明了需要进行数据预加载的目标数据集，在该例子中，我们的数据预加载目标为`default`命名空间下名为`spark`的数据集，如果该配置与你所在的实际环境不符，请根据你的实际环境对其进行调整。
+`spec.dataset`指明了需要进行数据预加载的目标数据集，在该例子中，我们的数据预加载目标为`default`命名空间下名为`spark`的数据集，如果该配置与你所在的实际环境不符，请根据你的实际环境对其进行调整。**注意** 你的DataLoad的namespace须和你的dataset的namespace保持一致。
 
 **默认情况下，上述DataLoad配置将会尝试加载整个数据集中的全部数据**，如果你希望进行更细粒度的控制(例如：仅加载数据集下指定路径的数据)，请参考[DataLoad进阶配置](#DataLoad进阶配置)
 

docs/zh/samples/s3_configuration.md

@@ -2,7 +2,7 @@
 
 如果选择AWS S3作为Alluxio的底层存储系统，Alluxio需要进行额外配置，以使得Alluxio能够正常访问挂载的S3存储系统。
 
-本文档展示了如何在Fluid中以声明式的方式完成Alluxio所需的特殊配置。更多信息请参考[在Amazon AWS S3上配置Alluxio](https://docs.alluxio.io/os/user/stable/cn/ufs/S3.html)
+本文档展示了如何在Fluid中以声明式的方式完成Alluxio所需的特殊配置。更多信息请参考[在Amazon AWS S3上配置Alluxio](https://docs.alluxio.io/os/user/stable/en/ufs/S3.html)
 
 ## 前提条件
 
@@ -44,6 +44,7 @@ spec:
               key: aws.secretKey
 EOF
 ```
+注意: 不同的云厂商对象存储，region的配置要替换为`alluxio.underfs.s3.endpoint.region=<S3_ENDPOINT_REGION>`,具体详细信息，参考[在Amazon AWS S3上配置Alluxio](https://docs.alluxio.io/os/user/stable/en/ufs/S3.html)
 
 ```
 $ kubectl create -f dataset.yaml