MarginaliaSearch/code/processes

Processes

1. Crawl Process

The crawling-process fetches website contents, temporarily saving them as WARC files, and then re-converts them into parquet models. Both are described in crawling-model.

The operation is optionally defined by a crawl specification, which can be created in the control GUI.

2. Converting Process

The converting-process reads crawl data from the crawling step and processes them, extracting keywords and metadata and saves them as parquet files described in processed-data.

3. Loading Process

The loading-process reads the processed data.

It has creates an index journal, a link database, and loads domains and domain-links into the MariaDB database.

4. Index Construction Process

The index-construction-process constructs indices from the data generated by the loader.

Overview

Schematically the crawling and loading process looks like this:

    +-----------+  
    |  CRAWLING |  Fetch each URL and 
    |    STEP   |  output to file
    +-----------+
          |
    //========================\\
    ||  Parquet:              || Crawl
    ||  Status, HTML[], ...   || Files
    ||  Status, HTML[], ...   ||
    ||  Status, HTML[], ...   ||
    ||     ...                ||
    \\========================//
          |
    +------------+
    | CONVERTING |  Analyze HTML and 
    |    STEP    |  extract keywords 
    +------------+  features, links, URLs
          |
    //==================\\
    || Parquet:         ||  Processed
    ||  Documents[]     ||  Files
    ||  Domains[]       ||
    ||  Links[]         ||  
    \\==================//
          |
    +------------+ Insert domains into mariadb
    |  LOADING   | Insert URLs, titles in link DB
    |    STEP    | Insert keywords in Index
    +------------+    
          |
    +------------+
    | CONSTRUCT  | Make the data searchable
    |   INDEX    | 
    +------------+