How to use the command 'odps tunnel' (with examples)

The ‘odps tunnel’ command is a command-line interface for the data tunnel in ODPS (Open Data Processing Service). It allows users to download data from an ODPS table to a local file and upload data from a local file to an ODPS table partition. It also provides options to specify field and record delimiters and use multiple threads for uploading data.

Use case 1: Download table to local file

Code:

tunnel download table_name path/to/file;

Motivation: Downloading data from an ODPS table to a local file is useful when the user wants to work with the data locally or share it with external systems.

Explanation:

• tunnel download: The command for downloading data.
• table_name: The name of the ODPS table to download data from.
• path/to/file: The path to the local file where the downloaded data will be saved.

Example output: The specified ODPS table will be downloaded to the specified file.

Use case 2: Upload local file to a table partition

Code:

tunnel upload path/to/file table_name/partition_spec;

Motivation: Uploading data from a local file to an ODPS table partition is useful for adding new data to an existing table or updating specific partitions in the table.

Explanation:

• tunnel upload: The command for uploading data.
• path/to/file: The path to the local file containing the data to be uploaded.
• table_name/partition_spec: The name of the ODPS table and the specified partition where the data will be uploaded.

Example output: The specified local file will be uploaded to the specified ODPS table partition.

Use case 3: Upload table specifying field and record delimiters

Code:

tunnel upload path/to/file table_name -fd field_delim -rd record_delim;

Motivation: Specifying field and record delimiters during the upload process allows users to control how the data is formatted in the resulting ODPS table.

Explanation:

• tunnel upload: The command for uploading data.
• path/to/file: The path to the local file containing the data to be uploaded.
• table_name: The name of the ODPS table where the data will be uploaded.
• -fd field_delim: The field delimiter used in the data file.
• -rd record_delim: The record delimiter used in the data file.

Example output: The specified local file will be uploaded to the specified ODPS table, and the data will be formatted using the specified field and record delimiters.

Use case 4: Upload table using multiple threads

Code:

tunnel upload path/to/file table_name -threads num;

Motivation: Using multiple threads for uploading data can significantly speed up the process, especially when dealing with large amounts of data.

Explanation:

• tunnel upload: The command for uploading data.
• path/to/file: The path to the local file containing the data to be uploaded.
• table_name: The name of the ODPS table where the data will be uploaded.
• -threads num: The number of threads to be used for the upload process.

Example output: The specified local file will be uploaded to the specified ODPS table using the specified number of threads.

Conclusion:

The ‘odps tunnel’ command provides a convenient way to download data from an ODPS table to a local file and upload data from a local file to an ODPS table partition. Users can also customize the upload process by specifying field and record delimiters or using multiple threads. This command is essential for data migration and synchronization between ODPS and local systems.