We should not wait until we've fetched robots.txt to decide whether we have any data to fetch! This makes the live crawler very slow and leads to unnecessary requests.
Add `If-None-Match` and `If-Modified-Since` headers as appropriate to the feed fetcher's requests. On well-configured web servers, this should short-circuit the request and reduce the amount of bandwidth and processing that is necessary.
A new table was added to the FeedDb to hold one etag per domain.
If-Modified-Since semantics are based on the creation date for the feed database, which should serve as a cutoff date for the earliest update we can have received.
This completes the changes for Issue #136.
This change adds `Accept-Encoding: gzip` to all outbound requests from the live crawler and feed fetcher, and the corresponding decoding logic for the compressed response data.
The change addresses issue #136, save for making the fetcher's requests conditional.
Discovered feed URLs were given a double slash after their domain name in the DB. This will go away in the URL normalizer, so the URLs are still viable, but the commit fixes the issue regardless.
Feed discover is improved with by probing a few likely endpoints when no feed link tag is provided. To store the feed URLs, a sqlite database is added to each crawlset that stores a simple summary of the crawl job, including any feed URLs that have been discovered.
Solves issue #135
Previously, the sideloader did not generate a locality-sensitive hashCode for document details. This caused all documents from the same domain to be considered duplicates by the deduplication logic.
Updated the default "index.valuationThreads" to 16 for improved concurrency. Expanded buffer sizes and restructured result handling logic for better memory management and performance.
Updated the default "index.valuationThreads" to 16 for improved concurrency. Expanded buffer sizes and restructured result handling logic for better memory management and performance.
Updated the default "index.valuationThreads" to 16 for improved concurrency. Expanded buffer sizes and restructured result handling logic for better memory management and performance.
Added an additional filter step to ensure URLs with binary suffixes are excluded during crawling. This prevents unnecessary processing of non-HTML content, improving the efficiency of the link parsing process.
If the document's URL path is "/", a "special:root" meta flag is now added with the "Synthetic" bit set. This will help searching only for the root document of a website, neat stuff ahead :D
Centralized HTML feature handling with `applyFeatures` in StackexchangeSideloader and added dynamic synthetic term generation. Improved HTML structure in RedditSideloader and enhanced metadata processing with feature-based keywords. Updated DomainLinks to correctly compute link counts using individual link occurrences.
