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bigtable-erd-generator
Advanced tools
Entity Relationship Diagram generator for BigTable-style databases like HBase and Accumulo.
This is a basic entity relationship diagram (ERD) generator designed for data models that include the row key/column family/column qualifier structure (e.g. HBase, Accumulo). It generates a graphviz (.gv) file from .yaml/.yml files with Javascript, which can then be parsed using graphviz (dot and neato) into a png file.
Node Modules
Other Dependencies
Each table is generated from a separate YAML file (.yaml or .yml), parsed based on the format described below. There are four root level elements: table, rowKey, columnFamilies, and connections. Each file must start with a ---
and end with a ...
.
table
The table
element includes two subproperties: label
and description
. The label
element is required, but the description
element is optional and currently unimplemented. For a sample table which holds articles for a news outlet, the table
property might look like this:
table:
label: Article
description: Information about the articles published by our news source # Currently unimplemented
rowKey
The rowKey
element includes one subproperty per piece of information that is contained in the element. This format includes three parts: the name (e.g. title), the type (e.g. string), and a description of the property (e.g. The title of the element). The name and type are required, but the description is optional. Each subproperty employs one of the following two formats, depending on whether the description is included or not:
name: type - description
name: type
The rowKey
for an article for a news outlet might look like this:
rowKey:
articleTitle: string - The title of the article
articleAuthor: string - The author of the article
columnFamilies
The columnFamilies
element holds the structure of the table itself and has subproperties which are the names of the column families that are contained in the table. Each column family in turn has a subproperty for each column qualifier which is contained within that column family. The column qualifier properties are structured in the same manner as the properties within rowKey
described above with name, type and description (optional) portions.
A sample columnFamilies
property from an article for a news outlet:
columnFamilies:
Content:
rawText: string - The raw text of the article
htmlText: string - The html-formatted text of the article
Metadata:
author: string - The author of the article
postTime: long - The UNIX timestamp for the post-time of the article
lastUpdateTime: long - The UNIX timestamp for the time when the article was last updated
Column families with no column qualifiers are also acceptable, though unusual in practice.
connections
The connections
element holds a set of properties which show the relationships between this table and other tables. Each connection to another table is specified by a subproperty which holds the name of the table to connect to and a description of the relationship between them. They follow the format:
tableName: quantifier -> quantifier
Each quantifier can hold one of three values, many
, one
or none
. Anything else is assumed to be none
, and no arrowhead is drawn. Going back to our article example, if we had another table holding multiple Comment
s on each Article, there would a one to many relationship between the Article
and Comment
tables, and the following connections property in the Article
table:
connections:
Comment: one -> many
This poses a potential problem. If I identify the relationship from the opposite direction in my Comment
table, would there be two relationships drawn? In short, no. The two are identified as duplicates, and only one arrow is drawn.
Overall Article YAML File
---
table:
label: Article
description: Information about the articles published by our news source # Currently unimplemented
rowKey:
articleTitle: string - The title of the article
articleAuthor: string - The author of the article
columnFamilies:
Content:
rawText: string - The raw text of the article
htmlText: string - The html-formatted text of the article
Metadata:
author: string - The author of the article
postTime: long - The UNIX timestamp for the post-time of the article
lastUpdateTime: long - The UNIX timestamp for the time when the article was last updated
connections:
Comment: one -> many
...
FAQs
Entity Relationship Diagram generator for BigTable-style databases like HBase and Accumulo.
We found that bigtable-erd-generator demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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