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Web crawler update strategy


Web crawler update strategy

By : user3862011
Date : November 21 2020, 07:01 PM
this one helps. The "batch" algorithm you describe is a common way to implement this, I have worked on a few such implementations with scrapy.
The approach I took is to initialize your spider start URLs to get the next batch to crawl and output the data (resources + links) as normal. Then process these as you choose to generate the next batch. It is possible to parallelize all of this, so you have many spiders crawling different batches at once, if you put URLs belonging to the same site in the same batch, then scrapy will take care of politeness (with some configuration for your preferences).
code :


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Asp.net Request.Browser.Crawler - Dynamic Crawler List?

Asp.net Request.Browser.Crawler - Dynamic Crawler List?


By : carstenbach
Date : March 29 2020, 07:55 AM
will be helpful for those in need I've been happy the the results supplied by Ocean's Browsercaps. It supports crawlers that Microsoft's config files has not bothered detecting. It will even parse out what version of the crawler is on your site, not that I really need that level of detail.
What is a decent update interval for a web crawler?

What is a decent update interval for a web crawler?


By : Olivier
Date : March 29 2020, 07:55 AM
Any of those help It's going to depend on the sites you are crawling and what you are doing with the results.
Some will not object to a fairly frequent visitation rate, but others might restrict you to one visit every day, for example.
Informatica update partial data using UPDATE strategy

Informatica update partial data using UPDATE strategy


By : Claes Barthelson
Date : March 29 2020, 07:55 AM
I wish this help you Yes, simply only connect the required ports. Note, that you need to define in your target the ID column as primary key.
Update variable when scrapy crawler is done

Update variable when scrapy crawler is done


By : Bill Treloar
Date : March 29 2020, 07:55 AM
Hope this helps I would like to keep track of how many crawlers are done when im running multiple crawlers within a loop. What I've tried is to use signals but it seems like my crawlers cannot find other modules outside its scope. What I would like to do is to register that the crawling is done inside another script e.g. by passing/updating a variable. , You can create a controller class and later import it in your spider:
code :
# controller.py
class Controller:
    def mark_as_done(self, spider):
        print("{} is done!".format(spider.name))
controller = Controller()
# myspider.py
from mypackage.controller import controller
...
crawler.signals.connect(controller.mark_as_done, signals.spider_closed) 
How to run AWS Glue Crawler after resource update/created?

How to run AWS Glue Crawler after resource update/created?


By : user3212329
Date : March 29 2020, 07:55 AM
around this issue You could use a local-exec provisioner to use the AWS CLI to trigger your Glue crawler once it is created:
code :
resource "aws_glue_crawler" "my_crawler" {
  database_name = "my_db"
  name          = "my_crawler"
  role          = "arn:aws:iam::111111111111:role/service-role/someRole"

  s3_target {
    path = "s3://my_bucket/key/prefix"
  }

  provisioner "local-exec" {
    command = "aws glue start-crawler --name ${self.name}"
  }
}
resource "aws_glue_crawler" "my_crawler" {
  database_name = "my_db"
  name          = "my_crawler"
  role          = "arn:aws:iam::111111111111:role/service-role/someRole"

  s3_target {
    path = "s3://my_bucket/key/prefix"
  }
}

resource "null_resource" "run_crawler" {
  # Changes to the crawler's S3 path requires re-running
  triggers = {
    s3_path = "${aws_glue_crawler.my_crawler.s3_target.0.path}"
  }

  provisioner "local-exec" {
    command = "aws glue start-crawler --name ${self.name}"
  }
}
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