jdk-based logger tend to block
at java.util.logging.Logger.log(Logger.java:476) in concurrent
environments. This makes logging a main performance issue. To overcome
this problem, this is a add-on to jdk logging to put log entries on a
concurrent message queue and log the messages one by one using a
separate process.
- FTPClient uses the concurrent logging instead of the log4j logger
- textarea input field can now be used to paste in a large list of hosts
- /31er subnet is possible (only one host)
- auto-detect subdomains for ftp and www subdomains
without the file extension. This part of the file path is removed from
the multi-field url_paths_sxt, which has now not the file name as last
part of the path list.
The same applies to the new fields source_file_name_s and
target_file_name_s in the webgraph schema.
references_internal_url_sxt because they had been shown to be
superfluous. The citation of referrer in the host browser is possible
without them. Therefore now the host browser does not only show
internal, but also external referrer to each link.
explored for citations within other documents. A click on the
'Citations' link shows an analysis with all text lines in the document
each with a complete list of documents which contain the same line. A
second section shows the linking documents in ascending order of number
of citations from the original document. Because documents from
different hosts are most interesting here, they are listed at the top of
the page as possible 'copypasta' source.
yacy will load linked web pages from search results until the total
number of web pages reaches 15000. This shall give fresh peers a 'boost'
to get faster a personalized search index.
texts, separated by sentences. Then, these sentences can be used to
search again in the index for the same sentence. This can be used to
provide a tool for plagiarism-search. (not finished yet).
Try the following:
http://localhost:8090/solr/select?q=text_t:flut&grep=wasser&defType=edismax&start=0&rows=3&core=collection1&wt=grephtml
.. to search for 'flut' and show only sentences in the result documents
which contain the word 'wasser'.
Consider this like using a grep-tool on documents: you select the
documents by a search query and you grep sentences inside the found
documents with the 'grep' attribute.
output writer. This made the creation of a html result writer necessary
which is included in this commit. The yacydoc servlet was used to
present all metadata to a document, but the solr interface can serve for
this purpose in a much better way. All usages (instead one) of yacydoc
were replaced by a solr call. This affects also the 'metadata' link
attached to search results.
function. This replaces the previous formula, which was bad. Before you
update to this version, please check if you changed the ranking function
yourself before, since it will be overwritten.
While the values for the reference evaluation are computed, also a
backlink-structure can be discovered and written to the index as well.
The host browser has been extended to show such backlinks to each
presented links. The host browser therefore can now show an information
where an document is linked. The new citation reference is computed as
likelyhood for a random click path with recursive usage of previously
computed likelyhood. This process is repeated until the likelyhood
converges to a specific number. This number is then normalized to a
ranking value CRn, 0<=CRn<=1. The value CRn can therefore be used to
rank popularity within intra-domain link structures.
- move setting of system property solr.directoryFactory=solr.MMapDirectoryFactory to solrcore.properties
- add check of os.arch for 64bit system, if it fails use default/solrcore.x86.properties (if exists) as solrcore.properties
reason: on 32bit MMapDirectoryFactory may fail with.....
Caused by: java.io.IOException: Map failed
at sun.nio.ch.FileChannelImpl.map(FileChannelImpl.java:849)
at org.apache.lucene.store.MMapDirectory.map(MMapDirectory.java:283)
signal in case that a cleanup process wants to remove the search
process. Added also a new cleanup process which can reduce the number of
stored searches to a specific number which can be higher or lower
according to the remaining RAM. The cleanup process is called every time
a search ist started.
soft commits, reduced caching size of search events, ensured that solr
results are processed before connection is closed to keep that stuff not
too long in RAM
API recording for this method so it can be repeated automatically. The
index dump generation is now also available for API recording. Added
some synchronization in backend which was necessary for this.
to fail if we access non-permanently available resources (peers, web
pages) and want to fail fast without repeating the same request which is
doomed to fail. The previous appearance of http client connection had a
1-2-4-8-second timeout scheme, which caused that connection attempts
lasted for 16 seconds.
id to be tested, but with a collection of ids. This will cause only a
single call to solr instead of many. The result is a much better
performace when testing the existence of many urls. The effect should
cause very much less IO during index transmission, both on sender and
receiver side.
process counter if an blocking thread dies. Added also a new column in
PerformanceConcurrency_p servlet to show the actual number of concurrent
processes.
This will enable https-access to YaCy, but this feature is disabled by
default using the new server.https=false attribute. This has two
purposes:
- make it easier for everyone to use https (just set server.https=true)
- provide the basis for secure yacy-to-yacy communication in the future
appeared after the declaration of robots allow/deny for the crawler
because the sitemap parser terminated after the allow/deny rules had
been found. Now the parser reads the robots.txt until the end to
discover also sitemap rules at the end of the file.
- removed httpclient 3.1 which has been used by solrj < 4.x.x and is now
not used any more
- fixed some parts in YaCy which used methods from httpclient 3.1
Because the index size is now provided by solr, and the only way to do
that is a match for [* TO *], a size computation is quite complex and
time-consuming. Therefore this patch prevents that the method is called
at all and if necessary puts a DOS-preventing barrier in front of it.
- check geolocation coordinates and accept only those, which are
well-formed
- the solr push process does not stop crawling any more if after 20
requests to Solr Solr does not accept the record. Instead, a severe log
entry asks the user to create a bug request
does not block when long-running updates to solr are made. This is
realized using blocking queues which process all long-running tasks in
the background. Also some bugfixes to existing connectors.
- intruduced raw-queries for the re-introduced byId-Queries (they are
hopefully faster than full edismax queries)
- removed the cached solr connector (testing this) to rely only on the
solr built-in search caches. That should save some RAM (also). We will
see if this is usable.
- added the field in crawl profile
- adopted logging end error management
- adopted duplicate document detection
- added a new rule to the indexing process to reject non-matching
content
- full redesign of the expert crawl start servlet
The new filter field can now be seen in /CrawlStartExpert_p.html at
Section "Document Filter", subsection item "Filter on Content of
Document"
adjusted to smaller and 1-core devices.
- the workflow processor now starts no process at all. these are started
as soon as parser/condenser/indexing queues are filled.
- better abstraction
used to select between different collections as defined during a crawl
start with the 'collection' attribute. This actually implements the
ability to prepare search tenants which restrict their search results to
a specific collection. The main use for this is to provide tenants to
the yaml4 interface (at this time).
holds the number of documents for the host where the document is hosted.
This is necessary for ranking and the norming of references per local
host in the ranking computation.
references_external_i and references_exthosts_i. These can be used to
count and evaluate the number of external links to every web page. An
experimental ranking function can be i.e.:
div(add(references_internal_i,product(references_external_i,references_exthosts_i)),add(clickdepth_i,1))
search interfaces if no other ranking attributes are given
- using the YaCy ranking in the GSA interface only if there was not
given a GSA-style sort attribute
- to avoid confusion about correct ranking attributes, only the default
'0'-ranking profile is used and not scenario-adopted (site, date)
because that should be configurable in the web interface before it is
used actually for ranking.
- memory allocation problem in RowCollection: if memory is too low, do
not to try to increase by 1 because this leads to very long execution
time and at the end to the same OOM as if we allocate the memory at the
moment we need it even if the resource observer states that this memory
is not there. To compensate this, the increase size is reduced.
- no document search this time
- adjusted banner and network to not show 'WORDS' but DHT Chunks. This
is to avoid confusion for robinson peers which do not create Word
Entries
- an existing ranking servlet for solr was extended. It is now possible
to set boost values for fields, boost functions and boost queries.
- The ranking can have different instances, but currently only the first
one is used
- added an abstraction layer for fields which can be used for search and
those fields can be edited in the solr ranking configruation
- the ranking value from solr within the field score is used to combine
remote search requests, which all are created using the same locally
defined boost values
- reduced the number of fields which are used for search (makes it
faster)
- replaced some text fields by string fields (makes indexing faster)
- removed classes which had no use
- made a large number of experiments for a better ranking and created a
temporary setting which prefers hits inside titles
- adjusted also the RWI-based ranking computation to 'prefer title'
- made special cases like for portal search where no post-processing and
post-ranking is wanted: this keeps the original ranking order as done by
Solr
- fixed many bugs with old settings for ranking
Michael Peter Christen