Uploading Data and Programs

Background

MRS clusters process data from OBS or HDFS. OBS provides customers with the data storage capabilities that are massive, secure, reliable, and cost-effective. MRS can directly process data in OBS. You can browse, manage, and use data on the web page of the management console and OBS Client.

Importing Data

Currently, MRS can only import data from OBS to HDFS. The file upload rate decreases with the increase of the file size. This mode applies to scenarios where the data volume is small.

You can perform the following steps to import files and directories:

1. Log in to the MRS management console.
2. Choose Clusters > Active Clusters and click the name of the cluster to be queried to enter the page displaying the cluster's information.
3. Click the Files tab to go to the file management page.
4. Select HDFS File List.
5. Go to the data storage directory, for example, bd_app1.

   The bd_app1 directory is only an example. You can use any directory on the page or create a new one.

   The requirements for creating a folder are as follows:

   • The folder name contains a maximum of 255 characters
   • The folder name cannot be empty.
   • The folder name cannot contain the following special characters: /:*?"<>|\;&,'`!{}[]$%+
   • The value cannot start or end with a period (.).
   • The spaces at the beginning and end are ignored.
6. Click Import Data and configure the HDFS and OBS paths correctly. When configuring the OBS or HDFS path, click Browse, select a file directory, and click Yes.
   • OBS path
     • The path must start with obs://.
     • Files or programs encrypted by KMS cannot be imported.
     • An empty folder cannot be imported.
     • The directory and file name can contain letters, digits, hyphens (-), and underscores (_), but cannot contain the following special characters ;|&>,<'$*?\
     • The directory and file name cannot start or end with a space, but can contain spaces between them.
     • The OBS full path contains a maximum of 255 characters.
   • HDFS path
     • The path starts with /user by default.
     • The directory and file name can contain letters, digits, hyphens (-), and underscores (_), but cannot contain the following special characters: ;|&>,<'$*?\:
     • The directory and file name cannot start or end with a space, but can contain spaces between them.
     • The HDFS full path contains a maximum of 255 characters.
7. Click OK.

   You can view the file upload progress on the File Operation Records tab page. MRS processes the data import operation as a DistCp job. You can also check whether the DistCp job is successfully executed on the Jobs tab page.

Exporting Data

After the data analysis and computing are completed, you can store the data in HDFS or export them to OBS.

You can perform the following steps to export files and directories:

1. Log in to the MRS management console.
2. Choose Clusters > Active Clusters and click the name of the cluster to be queried to enter the page displaying the cluster's basic information.
3. Click the Files tab to go to the file management page.
4. Select HDFS File List.
5. Go to the data storage directory, for example, bd_app1.
6. Click Export Data and configure the OBS and HDFS paths. When configuring the OBS or HDFS path, click Browse, select a file directory, and click Yes.
   • OBS path
     • The path must start with obs://.
     • The directory and file name can contain letters, digits, hyphens (-), and underscores (_), but cannot contain the following special characters ;|&>,<'$*?\
     • The directory and file name cannot start or end with a space, but can contain spaces between them.
     • The OBS full path contains a maximum of 255 characters.
   • HDFS path
     • The path starts with /user by default.
     • The directory and file name can contain letters, digits, hyphens (-), and underscores (_), but cannot contain the following special characters: ;|&>,<'$*?\:
     • The directory and file name cannot start or end with a space, but can contain spaces between them.
     • The HDFS full path contains a maximum of 255 characters.
   

   When a folder is exported to OBS, a label file named folder name_$folder$ is added to the OBS path. Ensure that the exported folder is not empty. If the exported folder is empty, OBS cannot display the folder and only generates a file named folder name_$folder$.

7. Click OK.

   You can view the file upload progress on the File Operation Records tab page. MRS processes the data export operation as a DistCp job. You can also check whether the DistCp job is successfully executed on the Jobs tab page.