We started our second broad crawl for 2019, first step with a byte limit of 50 MB per domain. Second step will have a byte limit of 16 GB per domain. We adjusted the byte limits after having analyzed last year’s broad crawls.
“Ultra big sites”, “OAI-extraction (research databases)”, “Ministries and administrative bodies” and YouTube crawls are running simultaneously with the broad crawl.
We started a selective crawl for the approaching parliamentary elections. We hoped that they would take place together with the elections for the European Parliament, but they will not. At the monthly curator meeting tomorrow, we will have to agree on how to deal with the European parliament elections.
We prepared our list of politicians Facebook profiles and fixed the URL’s as BNE does for the crawl with our Archive-IT account.
We upgraded UMBRA in the production system
In April, we organized an internal workshop on responsive websites. As a start, we selected a sample of websites. We first tried to visualize the archives of these sites with a more recent version of Firefox and Chromium : half of the problems disappeared which lead us to conclude that many problems are in fact access issues and not crawling issues. As we used Firefox as User agent, the visual quality was better with Firefox than Chromium.
In a second step, we analysed the source code of the websites which had crawling issues. The conclusion of these analysis was that each site has peculiarities that are specific to it. To solve the crawling problems, we tried :
- to use various user-agents (e.g. specific version of firefox user-agent, Chrome) but this change did not significantly change the quality of the crawl and the choice of the user-agent must be consistent with the choice of the browser used for the access.
- to crawl the websites with the latest release of Umbra included in NAS. During the tests, Umbra fell as during our first tests in December. It's very efficient for social networks as Instagram or pinterest, especially to crawl images. But due to the instability of the application, it's impossible to put it in production. We'll probably test it again during the preparation of our broad crawl tests.
We used to start our annual broad crawl on April but due to the changes in our IT Team we had to postpone it until summer.
For this reason, in addition, we have not been able to proceed with BCWeb updating not even study the implementation of UMBRA
We are working intensively in the collections about the diferents elections: European Parlament elections, local elections and Spanish Government elections. We launch a daily harvest in each collection to collect as much as possible of Twitter and Facebook profiles.