Filter queries are not actually related to ranking, but user requests
have pointed out that specific boost queries to move results to the end
of the result list are not sufficient. Such boost filters may be better
executed as actual filter and therefore such a filter can now be
statically applied to every search request. A typical use could be the
expression "http_unique_b:true AND www_unique_b:true" which uses the
recently introduced fields http_unique_b and www_unique_b which are true
only for one of the alternatives with/without http(s) and with/without
prefix 'www.' in host names.
The collection field (can be filled i.e. in Crawl Start) can be used to
add categories to YaCy index entries. The usage of that field was
restricted to solr searches and post argument filters as implemented in
commit f7571386a3.
This commit extends collections to a full navigation option in the
standard YaCy search interface. The field is not active by default but
can be activated easily in the /ConfigSearchPage_p.html servlet (just
check the 'Collection' facet field). Collections can now be used for (at
least) two purposes:
- to provide search tenants (through post argument collection)
- to provide self-made category navigation
Search requests may now have (independently from switched on or off
collection facet) a "collection:<collection-name>" modifier attached;
firthermore collection names may use disjunctions using the '|' pipe
symbol. For example, this is a valid search request:
www collection:user|proxy
on proxied pages a link to exit proxy is added to top of page.
Link text can be configured in web.xml init-parameter (see default/web.xml). If missing no link is displayed.
resource.disk.used.max.overshot by 4 times because first users reached
that limit and wondered why the crawler was paused automatically :)
The crawler will now stop at 2TB disk usage :)
This organizes all urls to be loaded in separate queues for each host.
Each host separates the crawl depth into it's own queue. The primary
rule for urls taken from any queue is, that the crawl depth is minimal.
This produces a crawl depth which is identical to the clickdepth.
Furthermorem the crawl is able to create a much better balancing over
all hosts which is fair to all hosts that are in the queue.
This process will create a very large number of files for wide crawls in
the QUEUES folder: for each host a directory, for each crawl depth a
file inside the directory. A crawl with maxdepth = 4 will be able to
create 10.000s of files. To be able to use that many file readers, it
was necessary to implement a new index data structure which opens the
file only if an access is wanted (OnDemandOpenFileIndex). The usage of
such on-demand file reader shall prevent that the number of file
pointers is over the system limit, which is usually about 10.000 open
files. Some parts of YaCy had to be adopted to handle the crawl depth
number correctly. The logging and the IndexCreateQueues servlet had to
be adopted to show the crawl queues differently, because the host name
is attached to the port on the host to differentiate between http,
https, and ftp services.
- removed the default version blacklist regex from init (for future versions)
!!! left existing update blacklist setting untouched !!!
(existing installation wanting autoupdate for 1.71 need to change blacklist in ConfigUpdate_p.html)
- moved old blacklist patch to migration.java
a document. This is the upper limit for the clickdepth_i value which may
be shorter in case that the crawler did not take the shortest path to
the document.
- use JSoup parser for selective rewrite of html body <a href= links only,
instead of regex which rewrites also header href/src links
- this improves display of pages which use header <base> tag
- tags with src attribute are taken from original location (like css) improving display and are not routed trough the indexer
Disadvantage: scripting links will drop out of proxy
Setting of the servlet through web.xml exclusivly (in case one would like to quickly switch back to the YaCyProxyServlet,
leaving the existing code of YaCyProxyServlet untouched available)
- they are incomplete and buggy
- it was not easy to explain
- it did not comply with a KISS strategy
- setting a performance of low priority actually caused crashing of a
peer
- there was nobody who would maintain that functionality
config settings frome the page also removed from yacy.init
augmentation.reflect
augmentation.addDoctype
augmentation.reparse
interaction.overlayinteraction.enabled
is VERY high. This applies also if the CPU load is high because of
in-cache crawling; in that case we want to experience a high-CPU load as
much as possible
The resource observer is now able to recognize free disk space AND
available space for YaCy. The amount of space which is assigned for YaCy
are defined in new settings in the configuration file.
Furthermore, there is now a cleanup process which deletes files in case
that an autodelete is activated. The autodelete is now BY DEFAULT ON if
the disk space is low, which means that YaCy starts to delete documents
when the disk is full!
if load > 1 (but < 2) but only if there is enough memory (now: 0.5 GB
RAM available). The memory amount of the postprocessing is the cause
that systems block because they run into a frequent-GC chain which
almost locks the peer. If running with enough memory, the postprocessing
is fast and not damaging to the system.
Because the required RAM of 0.5 GB is never available in default
setting, the postprocessing will not run if the peer is not reconfigured
to use more memory.
introduced, it was also used for search facets. The generic search
facets are now deduced from generic solr fields which makes jena as tool
for facet semantics superfluous.
Michael Peter Christen