Map Data To Graph

Map Data To Graph

After you have created a graph schema, the next major step is to map your data to the schema. Click "Map Data To Graph" on the left side menu bar. The working panel is split into a left panel and a right panel. Initially when there is no data mapping yet, the left panel will display only the graph schema.

The main steps are

  1. Select a data source.

  2. Add data file(s)

  3. Map data file(s) to vertex/edge types

  4. Map data file columns to vertex/edge fields

  5. Publish data mapping

1 Select a Data Source

Beginning with v2.4, GraphStudio supports loading data from a variety of different data sources. Originally, data could only be loaded from local files. TigerGraph 2.4 adds support for using Amazon S3 data files directly through the GUI. In future releases, GraphStudio will support loading from other data sources.

Click the data file type selector button on the banner of Add Data File window, and choose either File or S3 from the list:

2 Add Data Files

This section contains a subsection for each of the different data sources. Read the section which pertains to your data source:

Add Local Data File

Initially, there are no data files in the server data folder.

Upload File To Server

There is a limit of 500MB on file size. If you are using on-premises deployment, you can bypass this limit by directly putting the data files or their softlinks in the server data folder, located at <TigerGraph_root_dir>/loadingData.

Once the file is uploaded to the server, it will appear in the "Files on server" list on the left side of the Add Data Files window.

Data Files must be .csv files

The Add Data File box will only upload files which end in ".csv". If you manually place files in the <TigerGraph_root_dir>/loadingData folder, please don't put any files into subfolders because they will be ignored.

Configure the File Parser

In this step, you tell GraphStudio how to parse your data file. If your data file is in tabular format, the parser will split each line into a series of tokens. Click on one file from the file list to choose it. The parsing result for the first line of data is shown as a preview table on the right side:

If the parsing is not correct, click on the down arrow in a table column to choose a different option for file format, delimiter, or end of line. The file will immediately be re-parsed when you change a setting. The enclosing character is used to mark the boundaries of a token, overriding the delimiter character. For example, if your delimiter is comma (,), but you have commas in some strings, then you can define either double quotes (") or single quotes (') as the enclosing character to mark the endpoints of your string tokens. It is not necessary for every token to have enclosing characters; the parser will use enclosing characters when it encounters them.

After adding all your data files, continue with Step 3 Map Data to Vertex/Edge Types

Create S3 data source

After you click the S3 data source icon, you should see the following window:

Initially, there are no S3 data sources in the system.

A data source is an appropriately configured connection to some remote source of data file(s). When the data file type is switched to S3, you can configure connection to your S3 buckets.

The data source will be created and shown in the Data Source list:

For security reasons, user-created data sources won't be exported when you export solutions. If you import a solution with S3 data sources, you will need to manually create the data sources again (either though GraphStudio Map Data To Graph page or through the GSQL shell).

Click the data source to list all the buckets the credentials can access, and click the Expand icon to see all the buckets or folders within the buckets. The file hierarchy will be shown as a tree. Choose the file you want to add, and change the parsing options if necessary. (See Configure the file parser.)

Data files, after decompression, must be in either csv or parquet format.

TigerGraph supports loading from archived and compressed S3 files directly. Currently supported file extensions includes zip, tar.gz, tgz and tar. GraphStudio detects the file extension and automatically chooses the corresponding file format. If the file is encoded with one of these formats but has a non-standard file extension, you can manually specify the File format.

After clicking the ADD button, an S3 file icon will appear on the working panel:

After adding all your s3 data files, continue with Step 3 Map Data Files to Vertex/Edge Types

3 Map Data Files To Vertex Type Or Edge Type

Then, click the data file icon. A hint will appear over the icon:

Next, click the target vertex type circle or edge type link. A dashed link will appear between the data file and the target vertex or edge type:

A red hint will appear if the target type has not yet received a mapping for its primary id(s).

4 Map Data Columns To Vertex Or Edge Attributes

In this step, you link particular columns of a data file to particular ids or attributes of a vertex type or edge type. First, choose one data mapping from one data file to one vertex or edge type (represented as a dashed green link on the left working panel). When selected, the dashed line becomes orange (active), and the right working panel will show two tables. The left table shows the data file columns along with the first row's tokens as sample data. The right table shows the fields of the target vertex or edge. For a vertex, its fields are primary id and attributes. For an edge, its fields are source vertex, target vertex, and attributes.

In order to a column in the data file to a vertex or edge field, first click the row representing the data column in the left side data file table:

Then, click the row representing the target field in the right side table. A green arrow appears to show the mapping. Repeat as needed to create all the mappings for this table-to-vertex/edge pair. Since many-to-one mapping is allowed, it is not necessary for one table to provide a mapping for every field in the target vertex/edge.

Using a Token Function

GraphStudio gives you access to both a set of built-in functions and user-defined token functions to preprocess data file tokens before loading them in to the graph. For example, you can concatenate two columns in the data file and load them as an attribute. This section describes how to use these token functions.

GraphStudio currently does not support creating new user-defined functions. If a user-defined function has been added via the GSQL interface, it will be listed here. To use a user-defined token function, you must manually specify the number of input parameters. The C++ code is shown in the right hand side for your reference:

A token function table will be added to the attribute mapping panel. You can drag the tables to rearrange them. Token functions act as an intermediate step in the mapping. Create mappings from the data file table to the token function table, and then from the token function table to the vertex/attribute table The final result looks like below:

Auto Mapping

Map A Constant Value To An Attribute Or Token Function Input

Sometimes, a user may need to load a constant value to an id or attribute. Here we show how to do this in GraphStudio.

Loading A Constant to An Attribute

In the right working panel, double-click on the target id or attribute (in the left column of the right table). In the example below, the attribute "label" has been double-clicked:

This will cause the Load Constant window to pop up. Type in the constant value, and click the Add button to apply the mapping.

After adding the constant value, the attribute's label will change to id/attribute = "(your valid input value)" .

To modify or remove a constant mapping, double-click the id/attribute again. In the Load Constant window, enter the new value, or erase the value if you want to remove the mapping. Click the Add button to apply.

Use A Constant Input for a Token Function

First add the token function. Then double-click on the target input (in the left column of the token function table). In the example below, "Input 0" has been double-clicked.

This will cause the Load Constant window to pop up. Type in the constant value and click the Add button to apply the mapping. After adding the constant value, the input's label will change to Input = "(your input value)" .

The constant value can be modified or removed by double-clicking the label and editing the value in the Load Constant window.

Add Data Filter

You can add a data filter to a data mapping so that only data records which meet conditions that you specify will be loaded into the graph. This is equivalent to the WHERE clause in a GSQL load statement.

You can add one data filter for each data mapping from a data file to a vertex type or edge type, and the data filter only applies to that one mapping. Consider the following data mapping:

  1. The top section shows one row of sample data from your file, as a handy reference to the file's contents.

  2. The middle sections shows what the data filter looks like when it is converted a to GSQL WHERE clause. For more details, see the WHERE Clause section in the GSQL Language Reference Part 1 - Defining Graphs and Loading Data

  3. The bottom section is where you define your data filter. The data filter will be converted to a GSQL WHERE clause and shown in real time.

A data filter condition is a Boolean expression, which can be a nested set of conditions. GraphStudio evaluates the condition for each line in your input file. If the condition evaluates to true, then the line is loaded.

First, click the Build Data Filter chooser (with default value "None"). A menu will appear, with many Boolean expression templates. Choose one of the options. If you plan to build a nested condition, start with your top level. The first several options are for comparison expressions:

After this are several more options, using operators such as AND, OR, NOT, IN, BETWEEN...AND, IS NUMERIC, and IS EMPTY.

Note that each of these expressions calls for 1, 2, 3, or a list of operands, and the operands themselves can be expressions. When you select an expression, additional choosers will appear below, for you to specify the operand expressions. The operand choices are context-sensitive, but typically they include

  • a Data Column from the input file

  • A constant value

  • If the operator is AND, OR, or NOT, then the operand can be another condition. Thus is how conditions can be nested.

Suppose you are loading friendship edges where the input data fields are (person1, person2, friendship_start_date). You want to load only the records where person1 is Tom and the friendship began on or before 2017-06-10. The data filter looks like the following:

After adding the data filter, the right working panel will look like this:

To remove a data filter, select "None" at the top level dropdown of Build Data Filter section and then click Add. The data filter will be deleted.

Delete Options

Delete Data File

Select the data file icon(s), then click the delete button.

Delete Data File To Vertex Or Edge Mapping

Select the dashed green link(s) between data file and mapped vertex/edge type, then click the delete button.

Delete Data Column To Vertex Or Edge Attribute Mapping

Select the green arrow(s) between data file table and vertex/edge attributes table, then click the delete button.

Delete Token Functions

Select the token function table(s), then click the delete button.

Undo And Redo

5 Publish Data Mapping

Expand Panels

By default, the two windows have equal widths. Click the left button to widen the left working panel, or click the right button to widen the right working panel.

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