History

Viktor Lofgren e4372289a5 Use fixed buffers for BigString compression and decompression to reduce GC churn. fixup! Use fixed buffers for BigString compression and decompression to reduce GC churn.		2023-06-19 17:58:19 +02:00
..
converting-process	Move list-conversion into getDescription method.	2023-06-19 17:58:19 +02:00
crawling-process	Use fixed buffers for BigString compression and decompression to reduce GC churn.	2023-06-19 17:58:19 +02:00
loading-process	Reduce log noise during loading. Bad URLs don't need to be loaded, they can be grepped from the instructions.	2023-04-30 18:36:44 +02:00
readme.md	Remove unrelated code, break tools into their own directory.	2023-03-17 16:03:11 +01:00

readme.md

Processes

1. Crawl Process

The crawling-process fetches website contents and saves them as compressed JSON models described in crawling-model.

The operation is specified by a crawl job specification. This is generated by tools/crawl-job-extractor based on the content in the database.

2. Converting Process

The converting-process reads crawl data from the crawling step and processes them, extracting keywords and metadata and saves them as compressed JSON models described in converting-model.

3. Loading Process

The loading-process reads the processed data and creates an index journal and lexicon, and loads domains and addresses into the MariaDB-database.

Overview

Schematically the crawling and loading process looks like this:

    //====================\\
    || Compressed JSON:   ||  Specifications
    || ID, Domain, Urls[] ||  File
    || ID, Domain, Urls[] ||
    || ID, Domain, Urls[] ||
    ||      ...           ||
    \\====================//
          |
    +-----------+  
    |  CRAWLING |  Fetch each URL and 
    |    STEP   |  output to file
    +-----------+
          |
    //========================\\
    ||  Compressed JSON:      || Crawl
    ||  Status, HTML[], ...   || Files
    ||  Status, HTML[], ...   ||
    ||  Status, HTML[], ...   ||
    ||     ...                ||
    \\========================//
          |
    +------------+
    | CONVERTING |  Analyze HTML and 
    |    STEP    |  extract keywords 
    +------------+  features, links, URLs
          |
    //==================\\
    || Compressed JSON: ||  Processed
    ||  URLs[]          ||  Files
    ||  Domains[]       ||
    ||  Links[]         ||  
    ||  Keywords[]      ||
    ||    ...           ||
    ||  URLs[]          ||
    ||  Domains[]       ||
    ||  Links[]         ||    
    ||  Keywords[]      ||
    ||    ...           ||
    \\==================//
          |
    +------------+
    |  LOADING   | Insert URLs in DB
    |    STEP    | Insert keywords in Index
    +------------+