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<?xml version="1.0"?>
<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>
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<!-- Do not modify this file directly. Instead, copy entries that you -->
<!-- wish to modify from this file into nutch-site.xml and change them -->
<!-- there. If nutch-site.xml does not already exist, create it. -->
<configuration>
<!-- general properties -->
<property>
<name>store.ip.address</name>
<value>false</value>
<description>Enables us to capture the specific IP address
(InetSocketAddress) of the host which we connect to via
the given protocol. Currently supported is protocol-ftp and
http.
</description>
</property>
<!-- file properties -->
<property>
<name>file.content.limit</name>
<value>1048576</value>
<description>The length limit for downloaded content using the file://
protocol, in bytes. If this value is nonnegative (>=0), content longer
than it will be truncated; otherwise, no truncation at all. Do not
confuse this setting with the http.content.limit setting.
</description>
</property>
<property>
<name>file.crawl.parent</name>
<value>true</value>
<description>The crawler is not restricted to the directories that you specified in the
Urls file but it is jumping into the parent directories as well. For your own crawlings you can
change this behavior (set to false) the way that only directories beneath the directories that you specify get
crawled.</description>
</property>
<property>
<name>file.crawl.redirect_noncanonical</name>
<value>true</value>
<description>
If true, protocol-file treats non-canonical file names as
redirects and does not canonicalize file names internally. A file
name containing symbolic links as path elements is then not
resolved and &quot;fetched&quot; but recorded as redirect with the
canonical name (all links on path are resolved) as redirect
target.
</description>
</property>
<property>
<name>file.content.ignored</name>
<value>true</value>
<description>If true, no file content will be saved during fetch.
And it is probably what we want to set most of time, since file:// URLs
are meant to be local and we can always use them directly at parsing
and indexing stages. Otherwise file contents will be saved.
!! NO IMPLEMENTED YET !!
</description>
</property>
<!-- HTTP properties -->
<property>
<name>http.agent.name</name>
<value></value>
<description>HTTP 'User-Agent' request header. MUST NOT be empty -
please set this to a single word uniquely related to your organization.
NOTE: You should also check other related properties:
http.robots.agents
http.agent.description
http.agent.url
http.agent.email
http.agent.version
and set their values appropriately.
</description>
</property>
<property>
<name>http.robots.agents</name>
<value></value>
<description>Any other agents, apart from 'http.agent.name', that the robots
parser would look for in robots.txt. Multiple agents can be provided using
comma as a delimiter. eg. mybot,foo-spider,bar-crawler
The ordering of agents does NOT matter and the robots parser would make
decision based on the agent which matches first to the robots rules.
Also, there is NO need to add a wildcard (ie. "*") to this string as the
robots parser would smartly take care of a no-match situation.
If no value is specified, by default HTTP agent (ie. 'http.agent.name')
would be used for user agent matching by the robots parser.
</description>
</property>
<property>
<name>http.robot.rules.whitelist</name>
<value></value>
<description>Comma separated list of hostnames or IP addresses to ignore
robot rules parsing for. Use with care and only if you are explicitly
allowed by the site owner to ignore the site's robots.txt!
</description>
</property>
<property>
<name>http.robots.403.allow</name>
<value>true</value>
<description>Some servers return HTTP status 403 (Forbidden) if
/robots.txt doesn't exist. This should probably mean that we are
allowed to crawl the site nonetheless. If this is set to false,
then such sites will be treated as forbidden.</description>
</property>
<property>
<name>http.agent.description</name>
<value></value>
<description>Further description of our bot- this text is used in
the User-Agent header. It appears in parenthesis after the agent name.
</description>
</property>
<property>
<name>http.agent.url</name>
<value></value>
<description>A URL to advertise in the User-Agent header. This will
appear in parenthesis after the agent name. Custom dictates that this
should be a URL of a page explaining the purpose and behavior of this
crawler.
</description>
</property>
<property>
<name>http.agent.email</name>
<value></value>
<description>An email address to advertise in the HTTP 'From' request
header and User-Agent header. A good practice is to mangle this
address (e.g. 'info at example dot com') to avoid spamming.
</description>
</property>
<property>
<name>http.agent.version</name>
<value>Nutch-1.17-SNAPSHOT</value>
<description>A version string to advertise in the User-Agent
header.</description>
</property>
<property>
<name>http.agent.rotate</name>
<value>false</value>
<description>
If true, instead of http.agent.name, alternating agent names are
chosen from a list provided via http.agent.rotate.file.
</description>
</property>
<property>
<name>http.agent.rotate.file</name>
<value>agents.txt</value>
<description>
File containing alternative user agent names to be used instead of
http.agent.name on a rotating basis if http.agent.rotate is true.
Each line of the file should contain exactly one agent
specification including name, version, description, URL, etc.
</description>
</property>
<property>
<name>http.agent.host.cookie.file</name>
<value>cookies.txt</value>
<description>
File containing per-host configured cookies.
</description>
</property>
<property>
<name>http.agent.host</name>
<value></value>
<description>Name or IP address of the host on which the Nutch crawler
would be running. Currently this is used by 'protocol-httpclient'
plugin.
</description>
</property>
<property>
<name>http.timeout</name>
<value>10000</value>
<description>The default network timeout, in milliseconds.</description>
</property>
<property>
<name>http.content.limit</name>
<value>1048576</value>
<description>The length limit for downloaded content using the http/https
protocols, in bytes. If this value is nonnegative (>=0), content longer
than it will be truncated; otherwise, no truncation at all. Do not
confuse this setting with the file.content.limit setting.
</description>
</property>
<property>
<name>http.time.limit</name>
<value>-1</value>
<description>The time limit in seconds to fetch a single document.
If this value is nonnegative (>=0), the HTTP protocol implementation
will stop reading from a socket after http.time.limit seconds have
been spent for fetching this document. The HTTP response is then
marked as truncated. The http.time.limit should be set to a longer
time period than http.timeout, as it applies to the entire duration
to fetch a document, not only the network timeout of a single I/O
operation. Note: supported only by protocol-okhttp.
</description>
</property>
<property>
<name>http.partial.truncated</name>
<value>false</value>
<description>
If true the HTTP protocol implementation may store the content of
partial fetches and mark the response as truncated instead of
throwing an exception which will cause the fetch to fail. This
allows to use the data which has already been fetched, instead of
retrying the fetch later. Note: supported only by protocol-okhttp.
</description>
</property>
<property>
<name>http.tls.certificates.check</name>
<value>false</value>
<description>
Whether to check the TLS/SSL server certificates for validity.
If true invalid (e.g., self-signed or expired) certificates are
rejected and the https connection is failed. If false insecure
TLS/SSL connections are allowed. Note that this property is
currently not supported by all http/https protocol plugins.
</description>
</property>
<property>
<name>http.proxy.host</name>
<value></value>
<description>The proxy hostname. If empty, no proxy is used.</description>
</property>
<property>
<name>http.proxy.port</name>
<value></value>
<description>The proxy port.</description>
</property>
<property>
<name>http.proxy.username</name>
<value></value>
<description>Username for proxy. This will be used by
'protocol-httpclient', if the proxy server requests basic, digest
and/or NTLM authentication. To use this, 'protocol-httpclient' must
be present in the value of 'plugin.includes' property.
NOTE: For NTLM authentication, do not prefix the username with the
domain, i.e. 'susam' is correct whereas 'DOMAIN\susam' is incorrect.
</description>
</property>
<property>
<name>http.proxy.password</name>
<value></value>
<description>Password for proxy. This will be used by
'protocol-httpclient', if the proxy server requests basic, digest
and/or NTLM authentication. To use this, 'protocol-httpclient' must
be present in the value of 'plugin.includes' property.
</description>
</property>
<property>
<name>http.proxy.realm</name>
<value></value>
<description>Authentication realm for proxy. Do not define a value
if realm is not required or authentication should take place for any
realm. NTLM does not use the notion of realms. Specify the domain name
of NTLM authentication as the value for this property. To use this,
'protocol-httpclient' must be present in the value of
'plugin.includes' property.
</description>
</property>
<property>
<name>http.auth.file</name>
<value>httpclient-auth.xml</value>
<description>Authentication configuration file for
'protocol-httpclient' plugin.
</description>
</property>
<property>
<name>http.proxy.type</name>
<value>HTTP</value>
<description>
Proxy type: HTTP or SOCKS (cf. java.net.Proxy.Type).
Note: supported by protocol-okhttp.
</description>
</property>
<property>
<name>http.proxy.exception.list</name>
<value></value>
<description>A comma separated list of hosts that don't use the proxy
(e.g. intranets). Example: www.apache.org</description>
</property>
<property>
<name>http.useHttp11</name>
<value>true</value>
<description>
If true, use HTTP 1.1, if false use HTTP 1.0 .
</description>
</property>
<property>
<name>http.useHttp2</name>
<value>false</value>
<description>
If true try HTTP/2 and fall-back to HTTP/1.1 if HTTP/2 not
supported, if false use always HTTP/1.1.
NOTE: HTTP/2 is currently only supported by protocol-okhttp and
requires at runtime Java 9 or a modified Java 8 with support for
ALPN (Application Layer Protocol Negotiation).
</description>
</property>
<property>
<name>http.accept.language</name>
<value>en-us,en-gb,en;q=0.7,*;q=0.3</value>
<description>Value of the "Accept-Language" request header field.
This allows selecting non-English language as default one to retrieve.
It is a useful setting for search engines build for certain national group.
To send requests without "Accept-Language" header field, thi property must
be configured to contain a space character because an empty property does
not overwrite the default.
</description>
</property>
<property>
<name>http.accept</name>
<value>text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8</value>
<description>Value of the "Accept" request header field. A space character
as value will cause that no "Accept" header field is sent in the request.
</description>
</property>
<property>
<name>http.accept.charset</name>
<value>utf-8,iso-8859-1;q=0.7,*;q=0.7</value>
<description>Value of the "Accept-Charset" request header field. A space character
as value will cause that no "Accept-Charset" header field is sent in the request.
</description>
</property>
<property>
<name>http.store.responsetime</name>
<value>true</value>
<description>Enables us to record the response time of the
host which is the time period between start connection to end
connection of a pages host. The response time in milliseconds
is stored in CrawlDb in CrawlDatum's meta data under key &quot;_rs_&quot;
</description>
</property>
<property>
<name>http.enable.if.modified.since.header</name>
<value>true</value>
<description>Whether Nutch sends an HTTP If-Modified-Since header. It reduces
bandwidth when enabled by not downloading pages that respond with an HTTP
Not-Modified header. URL's that are not downloaded are not passed through
parse or indexing filters. If you regularly modify filters, you should force
Nutch to also download unmodified pages by disabling this feature.
</description>
</property>
<property>
<name>http.enable.cookie.header</name>
<value>true</value>
<description>Whether Nutch sends an HTTP Cookie header. The cookie value
is read from the CrawlDatum Cookie metadata field.
</description>
</property>
<!-- FTP properties -->
<property>
<name>ftp.username</name>
<value>anonymous</value>
<description>ftp login username.</description>
</property>
<property>
<name>ftp.password</name>
<value>anonymous@example.com</value>
<description>ftp login password.</description>
</property>
<property>
<name>ftp.content.limit</name>
<value>1048576</value>
<description>The length limit for downloaded content, in bytes.
If this value is nonnegative (>=0), content longer than it will be truncated;
otherwise, no truncation at all.
Caution: classical ftp RFCs never defines partial transfer and, in fact,
some ftp servers out there do not handle client side forced close-down very
well. Our implementation tries its best to handle such situations smoothly.
</description>
</property>
<property>
<name>ftp.timeout</name>
<value>60000</value>
<description>Default timeout for ftp client socket, in millisec.
Please also see ftp.keep.connection below.</description>
</property>
<property>
<name>ftp.server.timeout</name>
<value>100000</value>
<description>An estimation of ftp server idle time, in millisec.
Typically it is 120000 millisec for many ftp servers out there.
Better be conservative here. Together with ftp.timeout, it is used to
decide if we need to delete (annihilate) current ftp.client instance and
force to start another ftp.client instance anew. This is necessary because
a fetcher thread may not be able to obtain next request from queue in time
(due to idleness) before our ftp client times out or remote server
disconnects. Used only when ftp.keep.connection is true (please see below).
</description>
</property>
<property>
<name>ftp.keep.connection</name>
<value>false</value>
<description>Whether to keep ftp connection. Useful if crawling same host
again and again. When set to true, it avoids connection, login and dir list
parser setup for subsequent urls. If it is set to true, however, you must
make sure (roughly):
(1) ftp.timeout is less than ftp.server.timeout
(2) ftp.timeout is larger than (fetcher.threads.fetch * fetcher.server.delay)
Otherwise there will be too many "delete client because idled too long"
messages in thread logs.</description>
</property>
<property>
<name>ftp.follow.talk</name>
<value>false</value>
<description>Whether to log dialogue between our client and remote
server. Useful for debugging.</description>
</property>
<!-- web db properties -->
<property>
<name>db.fetch.interval.default</name>
<value>2592000</value>
<description>The default number of seconds between re-fetches of a page (30 days).
</description>
</property>
<property>
<name>db.fetch.interval.max</name>
<value>7776000</value>
<description>The maximum number of seconds between re-fetches of a page
(90 days). After this period every page in the db will be re-tried, no
matter what is its status.
</description>
</property>
<property>
<name>db.fetch.schedule.class</name>
<value>org.apache.nutch.crawl.DefaultFetchSchedule</value>
<description>The implementation of fetch schedule. DefaultFetchSchedule simply
adds the original fetchInterval to the last fetch time, regardless of
page changes, whereas AdaptiveFetchSchedule (see below) tries to adapt
to the rate at which a given page is changed.
</description>
</property>
<property>
<name>db.fetch.schedule.adaptive.inc_rate</name>
<value>0.4</value>
<description>If a page is unmodified, its fetchInterval will be
increased by this rate. This value should not
exceed 0.5, otherwise the algorithm becomes unstable.</description>
</property>
<property>
<name>db.fetch.schedule.adaptive.dec_rate</name>
<value>0.2</value>
<description>If a page is modified, its fetchInterval will be
decreased by this rate. This value should not
exceed 0.5, otherwise the algorithm becomes unstable.</description>
</property>
<property>
<name>db.fetch.schedule.adaptive.min_interval</name>
<value>60.0</value>
<description>Minimum fetchInterval, in seconds.</description>
</property>
<property>
<name>db.fetch.schedule.adaptive.max_interval</name>
<value>31536000.0</value>
<description>Maximum fetchInterval, in seconds (365 days).
NOTE: this is limited by db.fetch.interval.max. Pages with
fetchInterval larger than db.fetch.interval.max
will be fetched anyway.</description>
</property>
<property>
<name>db.fetch.schedule.adaptive.sync_delta</name>
<value>true</value>
<description>If true, try to synchronize with the time of page change.
by shifting the next fetchTime by a fraction (sync_rate) of the difference
between the last modification time, and the last fetch time.</description>
</property>
<property>
<name>db.fetch.schedule.adaptive.sync_delta_rate</name>
<value>0.3</value>
<description>See sync_delta for description. This value should not
exceed 0.5, otherwise the algorithm becomes unstable.</description>
</property>
<property>
<name>db.fetch.schedule.mime.file</name>
<value>adaptive-mimetypes.txt</value>
<description>The configuration file for the MimeAdaptiveFetchSchedule.
</description>
</property>
<property>
<name>db.update.additions.allowed</name>
<value>true</value>
<description>If true, updatedb will add newly discovered URLs, if false
only already existing URLs in the CrawlDb will be updated and no new
URLs will be added.
</description>
</property>
<property>
<name>db.preserve.backup</name>
<value>true</value>
<description>If true, updatedb will keep a backup of the previous CrawlDB
version in the old directory. In case of disaster, one can rename old to
current and restore the CrawlDB to its previous state.
</description>
</property>
<property>
<name>db.update.purge.404</name>
<value>false</value>
<description>If true, updatedb will add purge records with status DB_GONE
from the CrawlDB.
</description>
</property>
<property>
<name>db.update.purge.orphans</name>
<value>false</value>
<description>If true, updatedb will permanently delete URL's marked
as orphan from the CrawlDb. The plugin scoring-orphan needs to be
activated to get records marked as orphan. See the plugin's options
elsewhere in this document.
</description>
</property>
<property>
<name>crawldb.url.normalizers</name>
<value>false</value>
<description>
!Temporary, can be overwritten with the command line!
Normalize urls when updating crawldb
</description>
</property>
<property>
<name>crawldb.url.filters</name>
<value>false</value>
<description>
!Temporary, can be overwritten with the command line!
Filter urls when updating crawldb
</description>
</property>
<property>
<name>db.update.max.inlinks</name>
<value>10000</value>
<description>Maximum number of inlinks to take into account when updating
a URL score in the crawlDB. Only the best scoring inlinks are kept.
</description>
</property>
<property>
<name>db.ignore.internal.links</name>
<value>false</value>
<description>If true, outlinks leading from a page to internal hosts or domain
will be ignored. This is an effective way to limit the crawl to include
only initially injected hosts or domains, without creating complex URLFilters.
See 'db.ignore.external.links.mode'.
</description>
</property>
<property>
<name>db.ignore.external.links</name>
<value>false</value>
<description>If true, outlinks leading from a page to external hosts or domain
will be ignored. This is an effective way to limit the crawl to include
only initially injected hosts or domains, without creating complex URLFilters.
See 'db.ignore.external.links.mode'.
</description>
</property>
<property>
<name>db.ignore.also.redirects</name>
<value>true</value>
<description>If true, the fetcher checks redirects the same way as
links when ignoring internal or external links. Set to false to
follow redirects despite the values for db.ignore.external.links and
db.ignore.internal.links.
</description>
</property>
<property>
<name>db.ignore.external.links.mode</name>
<value>byHost</value>
<description>Alternative value is byDomain</description>
</property>
<property>
<name>db.ignore.external.exemptions.file</name>
<value>db-ignore-external-exemptions.txt</value>
<description>
This file contains exemption rules used by 'urlfiter-ignoreexempt' plugin
</description>
</property>
<property>
<name>db.injector.overwrite</name>
<value>false</value>
<description>Whether existing records in the CrawlDB will be overwritten
by injected records.
</description>
</property>
<property>
<name>db.injector.update</name>
<value>false</value>
<description>If true existing records in the CrawlDB will be updated with
injected records. Old meta data is preserved. The db.injector.overwrite
parameter has precedence.
</description>
</property>
<property>
<name>db.score.injected</name>
<value>1.0</value>
<description>The score of new pages added by the injector.
</description>
</property>
<property>
<name>db.score.link.external</name>
<value>1.0</value>
<description>The score factor for new pages added due to a link from
another host relative to the referencing page's score. Scoring plugins
may use this value to affect initial scores of external links.
</description>
</property>
<property>
<name>db.score.link.internal</name>
<value>1.0</value>
<description>The score factor for pages added due to a link from the
same host, relative to the referencing page's score. Scoring plugins
may use this value to affect initial scores of internal links.
</description>
</property>
<property>
<name>db.score.count.filtered</name>
<value>false</value>
<description>The score value passed to newly discovered pages is
calculated as a fraction of the original page score divided by the
number of outlinks. If this option is false, only the outlinks that passed
URLFilters will count, if it's true then all outlinks will count.
</description>
</property>
<property>
<name>db.max.outlinks.per.page</name>
<value>100</value>
<description>The maximum number of outlinks that we'll process for a page.
If this value is nonnegative (>=0), at most db.max.outlinks.per.page outlinks
will be processed for a page; otherwise, all outlinks will be processed.
</description>
</property>
<property>
<name>db.max.outlink.length</name>
<value>4096</value>
<description>
The maximum length in characters accepted for outlinks before
applying URL normalizers and filters. If this value is
nonnegative (>=0), only URLs with a length in characters less or
equal than db.max.outlink.length are accepted and then passed to
URL normalizers and filters. Doing the length check beforehand
avoids that normalizers or filters hang up on overlong URLs.
Note: this property is only used to check URLs found as outlinks
and redirects, but not for injected URLs.
</description>
</property>
<property>
<name>db.parsemeta.to.crawldb</name>
<value></value>
<description>Comma-separated list of parse metadata keys to transfer to the crawldb (NUTCH-779).
Assuming for instance that the languageidentifier plugin is enabled, setting the value to 'lang'
will copy both the key 'lang' and its value to the corresponding entry in the crawldb.
</description>
</property>
<property>
<name>db.fetch.retry.max</name>
<value>3</value>
<description>The maximum number of times a url that has encountered
recoverable errors is generated for fetch.</description>
</property>
<property>
<name>db.signature.class</name>
<value>org.apache.nutch.crawl.MD5Signature</value>
<description>The default implementation of a page signature. Signatures
created with this implementation will be used for duplicate detection
and removal.</description>
</property>
<property>
<name>db.signature.text_profile.min_token_len</name>
<value>2</value>
<description>Minimum token length to be included in the signature.
</description>
</property>
<property>
<name>db.signature.text_profile.quant_rate</name>
<value>0.01</value>
<description>Profile frequencies will be rounded down to a multiple of
QUANT = (int)(QUANT_RATE * maxFreq), where maxFreq is a maximum token
frequency. If maxFreq > 1 then QUANT will be at least 2, which means that
for longer texts tokens with frequency 1 will always be discarded.
</description>
</property>
<property>
<name>db.stats.score.quantiles</name>
<value>.01,.05,.1,.2,.25,.3,.4,.5,.6,.7,.75,.8,.9,.95,.99</value>
<description>
Quantiles of the distribution of CrawlDatum scores shown in the
CrawlDb statistics (command `readdb -stats'). Comma-separated
list of floating point numbers.
</description>
</property>
<!-- linkdb properties -->
<property>
<name>linkdb.max.inlinks</name>
<value>10000</value>
<description>Maximum number of Inlinks per URL to be kept in LinkDb.
If "invertlinks" finds more inlinks than this number, only the first
N inlinks will be stored, and the rest will be discarded.
</description>
</property>
<property>
<name>linkdb.ignore.internal.links</name>
<value>true</value>
<description>If true, when adding new links to a page, links from
the same host are ignored. This is an effective way to limit the
size of the link database, keeping only the highest quality
links.
</description>
</property>
<property>
<name>linkdb.ignore.external.links</name>
<value>false</value>
<description>If true, when adding new links to a page, links from
the a different host are ignored.
</description>
</property>
<property>
<name>linkdb.max.anchor.length</name>
<value>100</value>
<description>
The maximum number of characters permitted for anchor texts stored
in LinkDb.
</description>
</property>
<!-- generate properties -->
<property>
<name>generate.max.count</name>
<value>-1</value>
<description>The maximum number of urls in a single
fetchlist. -1 if unlimited. The urls are counted according
to the value of the parameter generate.count.mode.
</description>
</property>
<property>
<name>generate.count.mode</name>
<value>host</value>
<description>Determines how the URLs are counted for generate.max.count.
Default value is 'host' but can be 'domain'. Note that we do not count
per IP in the new version of the Generator.
</description>
</property>
<property>
<name>generate.update.crawldb</name>
<value>false</value>
<description>For highly-concurrent environments, where several
generate/fetch/update cycles may overlap, setting this to true ensures
that generate will create different fetchlists even without intervening
updatedb-s, at the cost of running an additional job to update CrawlDB.
If false, running generate twice without intervening updatedb will
generate identical fetchlists. See also crawl.gen.delay which defines
how long items already generated are blocked.</description>
</property>
<property>
<name>generate.min.score</name>
<value>0</value>
<description>Select only entries with a score larger than
generate.min.score.</description>
</property>
<property>
<name>generate.min.interval</name>
<value>-1</value>
<description>Select only entries with a retry interval lower than
generate.min.interval. A value of -1 disables this check.</description>
</property>
<property>
<name>generate.hostdb</name>
<value></value>
<description>Path to HostDB, required for the generate.max.count.expr
and generate.fetch.delay.expr properties.
See https://issues.apache.org/jira/browse/NUTCH-2368</description>
</property>
<property>
<name>generate.fetch.delay.expr</name>
<value></value>
<description>Controls variable fetcher.server.delay via a Jexl expression and
HostDB information. It allows you to alter fetch delay based on HostDB data.
See https://issues.apache.org/jira/browse/NUTCH-2368</description>
</property>
<property>
<name>generate.max.count.expr</name>
<value></value>
<description>Controls variable generate.max.count via a Jexl expression and
HostDB information. It allows you to alter maxCount based on HostDB data.
See https://issues.apache.org/jira/browse/NUTCH-2368</description>
</property>
<property>
<name>generate.restrict.status</name>
<value></value>
<description>Select only entries of this status, see
https://issues.apache.org/jira/browse/NUTCH-1248</description>
</property>
<!-- urlpartitioner properties -->
<property>
<name>partition.url.mode</name>
<value>byHost</value>
<description>Determines how to partition URLs. Default value is 'byHost',
also takes 'byDomain' or 'byIP'.
</description>
</property>
<property>
<name>crawl.gen.delay</name>
<value>604800000</value>
<description>
This value, expressed in milliseconds, defines how long we should keep the lock on records
in CrawlDb that were just selected for fetching. If these records are not updated
in the meantime, the lock is canceled, i.e. they become eligible for selecting again.
Default value of this is 7 days (604800000 ms). If generate.update.crawldb is false
the property crawl.gen.delay has no effect.
</description>
</property>
<!-- fetcher properties -->
<property>
<name>fetcher.server.delay</name>
<value>5.0</value>
<description>The number of seconds the fetcher will delay between
successive requests to the same server. Note that this might get
overridden by a Crawl-Delay from a robots.txt and is used ONLY if
fetcher.threads.per.queue is set to 1.
</description>
</property>
<property>
<name>fetcher.server.min.delay</name>
<value>0.0</value>
<description>The minimum number of seconds the fetcher will delay between
successive requests to the same server. This value is applicable ONLY
if fetcher.threads.per.queue is greater than 1 (i.e. the host blocking
is turned off).</description>
</property>
<property>
<name>fetcher.max.crawl.delay</name>
<value>30</value>
<description>
If the Crawl-Delay in robots.txt is set to greater than this value (in
seconds) then the fetcher will skip this page, generating an error report.
If set to -1 the fetcher will never skip such pages and will wait the
amount of time retrieved from robots.txt Crawl-Delay, however long that
might be.
</description>
</property>
<property>
<name>fetcher.threads.fetch</name>
<value>10</value>
<description>The number of FetcherThreads the fetcher should use.
This is also determines the maximum number of requests that are
made at once (each FetcherThread handles one connection). The total
number of threads running in distributed mode will be the number of
fetcher threads * number of nodes as fetcher has one map task per node.
</description>
</property>
<property>
<name>fetcher.threads.per.queue</name>
<value>1</value>
<description>This number is the maximum number of threads that
should be allowed to access a queue at one time. Setting it to
a value > 1 will cause the Crawl-Delay value from robots.txt to
be ignored and the value of fetcher.server.min.delay to be used
as a delay between successive requests to the same server instead
of fetcher.server.delay.
</description>
</property>
<property>
<name>fetcher.queue.mode</name>
<value>byHost</value>
<description>Determines how to put URLs into queues. Default value
is 'byHost', also takes 'byDomain' or 'byIP'. Crawl delays are
implemented on the level of fetcher queues.
</description>
</property>
<property>
<name>fetcher.verbose</name>
<value>false</value>
<description>If true, fetcher will log more verbosely.</description>
</property>
<property>
<name>http.log.exceptions.suppress.stack</name>
<value>java.net.UnknownHostException,java.net.NoRouteToHostException</value>
<description>Comma-separated list of exceptions not shown with full
stack trace in logs of fetcher and HTTP protocol implementations.
The logs may shrink in size significantly, e.g., when for a large
unrestriced web crawl unknown hosts are logged shortly without full
stack trace. The full class name of the exception class (extending
Throwable) including the package path must be specified.</description>
</property>
<property>
<name>fetcher.parse</name>
<value>false</value>
<description>If true, fetcher will parse content. Default is false, which means
that a separate parsing step is required after fetching is finished.</description>
</property>
<property>
<name>fetcher.store.content</name>
<value>true</value>
<description>If true, fetcher will store content.</description>
</property>
<property>
<name>fetcher.signature</name>
<value>false</value>
<description>If true, fetcher will generate the signature for
successfully fetched documents even if the content is not parsed by
fetcher (see property fetcher.parse). Default is false, which means
that the signature is calculated when parsing either by the fetcher
or during the parsing step. Note that a non-parsing fetcher can
only generate signatures based on the binary content and not on the
textual content. An appropriate signature class should be chosen
(see property db.signature.class).
</description>
</property>
<property>
<name>fetcher.timelimit.mins</name>
<value>-1</value>
<description>This is the number of minutes allocated to the fetching.
Once this value is reached, any remaining entry from the input URL list is skipped
and all active queues are emptied. The default value of -1 deactivates the time limit.
</description>
</property>
<property>
<name>fetcher.max.exceptions.per.queue</name>
<value>-1</value>
<description>The maximum number of protocol-level exceptions (e.g. timeouts) per
host (or IP) queue. Once this value is reached, any remaining entries from this
queue are purged, effectively stopping the fetching from this host/IP. The default
value of -1 deactivates this limit.
</description>
</property>
<property>
<name>fetcher.throughput.threshold.pages</name>
<value>-1</value>
<description>The threshold of minimum pages per second. If the fetcher downloads less
pages per second than the configured threshold, the fetcher stops, preventing slow queue's
from stalling the throughput. This threshold must be an integer. This can be useful when
fetcher.timelimit.mins is hard to determine. The default value of -1 disables this check.
</description>
</property>
<property>
<name>fetcher.throughput.threshold.retries</name>
<value>5</value>
<description>The number of times the fetcher.throughput.threshold.pages is allowed to be exceeded.
This settings prevents accidental slow downs from immediately killing the fetcher thread.
</description>
</property>
<property>
<name>fetcher.throughput.threshold.check.after</name>
<value>5</value>
<description>The number of minutes after which the throughput check is enabled.</description>
</property>
<property>
<name>fetcher.threads.timeout.divisor</name>
<value>2</value>
<description>(EXPERT)The thread time-out divisor to use. By default threads have a time-out
value of mapreduce.task.timeout / 2. Increase this setting if the fetcher waits too
long before killing hanged threads. Be careful, a too high setting (+8) will most likely kill the
fetcher threads prematurely.
</description>
</property>
<property>
<name>fetcher.queue.depth.multiplier</name>
<value>50</value>
<description>(EXPERT)The fetcher buffers the incoming URLs into queues based on the [host|domain|IP]
(see param fetcher.queue.mode). The depth of the queue is the number of threads times the value of this parameter.
A large value requires more memory but can improve the performance of the fetch when the order of the URLS in the fetch list
is not optimal.
</description>
</property>
<property>
<name>fetcher.follow.outlinks.depth</name>
<value>-1</value>
<description>(EXPERT)When fetcher.parse is true and this value is greater than 0 the fetcher will extract outlinks
and follow until the desired depth is reached. A value of 1 means all generated pages are fetched and their first degree
outlinks are fetched and parsed too. Be careful, this feature is in itself agnostic of the state of the CrawlDB and does not
know about already fetched pages. A setting larger than 2 will most likely fetch home pages twice in the same fetch cycle.
It is highly recommended to set db.ignore.external.links to true to restrict the outlink follower to URL's within the same
domain. When disabled (false) the feature is likely to follow duplicates even when depth=1.
A value of -1 of 0 disables this feature.
</description>
</property>
<property>
<name>fetcher.follow.outlinks.num.links</name>
<value>4</value>
<description>(EXPERT)The number of outlinks to follow when fetcher.follow.outlinks.depth is enabled. Be careful, this can multiply
the total number of pages to fetch. This works with fetcher.follow.outlinks.depth.divisor, by default settings the followed outlinks
at depth 1 is 8, not 4.
</description>
</property>
<property>
<name>fetcher.follow.outlinks.depth.divisor</name>
<value>2</value>
<description>(EXPERT)The divisor of fetcher.follow.outlinks.num.links per fetcher.follow.outlinks.depth. This decreases the number
of outlinks to follow by increasing depth. The formula used is: outlinks = floor(divisor / depth * num.links). This prevents
exponential growth of the fetch list.
</description>
</property>
<property>
<name>fetcher.follow.outlinks.ignore.external</name>
<value>true</value>
<description>Whether to ignore or follow external links. Set db.ignore.external.links to false and this to true to store outlinks
in the output but not follow them. If db.ignore.external.links is true this directive is ignored.
</description>
</property>
<property>
<name>fetcher.bandwidth.target</name>
<value>-1</value>
<description>Target bandwidth in kilobits per sec for each mapper instance. This is used to adjust the number of
fetching threads automatically (up to fetcher.maxNum.threads). A value of -1 deactivates the functionality, in which case
the number of fetching threads is fixed (see fetcher.threads.fetch).</description>
</property>
<property>
<name>fetcher.maxNum.threads</name>
<value>25</value>
<description>Max number of fetch threads allowed when using fetcher.bandwidth.target. Defaults to fetcher.threads.fetch if unspecified or
set to a value lower than it. </description>
</property>
<property>
<name>fetcher.bandwidth.target.check.everyNSecs</name>
<value>30</value>
<description>(EXPERT) Value in seconds which determines how frequently we should reassess the optimal number of fetch threads when using
fetcher.bandwidth.target. Defaults to 30 and must be at least 1.</description>
</property>
<property>
<name>fetcher.store.robotstxt</name>
<value>false</value>
<description>If true (and fetcher.store.content is also true),
fetcher will store the robots.txt response content and status for
debugging or archival purposes. The robots.txt is added to the
content/ folder of the fetched segment.
</description>
</property>
<property>
<name>fetcher.publisher</name>
<value>false</value>
<description>Set this value to true if you want to use an implementation of the Publisher/Subscriber model. Make sure to set corresponding
Publisher implementation specific properties</description>
</property>
<property>
<name>fetcher.filter.urls</name>
<value>false</value>
<description>Whether fetcher will filter URLs (with the configured URL filters).</description>
</property>
<property>
<name>fetcher.normalize.urls</name>
<value>false</value>
<description>Whether fetcher will normalize URLs (with the configured URL normalizers).</description>
</property>
<property>
<name>http.redirect.max</name>
<value>0</value>
<description>The maximum number of redirects the fetcher will follow when
trying to fetch a page. If set to negative or 0, fetcher won't immediately
follow redirected URLs, instead it will record them for later fetching.
</description>
</property>
<property>
<name>http.redirect.max.exceeded.skip</name>
<value>false</value>
<description>
Whether to skip the last URL in a redirect chain when when redirects
are followed (http.redirect.max > 0) and the maximum number of redirects
in a chain is exceeded (redirect_count > http.redirect.max).
If not skipped the redirect target URLs are stored as `linked`
and fetched in one of the following cycles. See also NUTCH-2748.
</description>
</property>
<!-- any23 plugin properties -->
<property>
<name>any23.extractors</name>
<value>html-microdata</value>
<description>Comma-separated list of Any23 extractors (a list of extractors is available here: http://any23.apache.org/getting-started.html)</description>
</property>
<property>
<name>any23.content_types</name>
<value>text/html,application/xhtml+xml</value>
<description>Comma-separated list of content-types onto which Any23 extractors should be applied (see http://www.iana.org/assignments/media-types/). If empty, all content-types are supported.</description>
</property>
<!-- moreindexingfilter plugin properties -->
<property>
<name>moreIndexingFilter.indexMimeTypeParts</name>
<value>true</value>
<description>Determines whether the index-more plugin will split the mime-type
in sub parts, this requires the type field to be multi valued. Set to true for backward
compatibility. False will not split the mime-type.
</description>
</property>
<property>
<name>moreIndexingFilter.mapMimeTypes</name>
<value>false</value>
<description>Determines whether MIME-type mapping is enabled. It takes a
plain text file with mapped MIME-types. With it the user can map both
application/xhtml+xml and text/html to the same target MIME-type so it
can be treated equally in an index. See conf/contenttype-mapping.txt.
</description>
</property>
<property>
<name>moreIndexingFilter.mapMimeTypes.field</name>
<value></value>
<description>It's used if moreIndexingFilter.mapMimeTypes is true. Indicates the field
where the mapped MIME-type must be written. If it's empty or unset, the content of the field "type"
will be replaced by the mapped MIME-type.
</description>
</property>
<!-- AnchorIndexing filter plugin properties -->
<property>
<name>anchorIndexingFilter.deduplicate</name>
<value>false</value>
<description>With this enabled the indexer will case-insensitive deduplicate anchors
before indexing. This prevents possible hundreds or thousands of identical anchors for
a given page to be indexed but will affect the search scoring (i.e. tf=1.0f).
</description>
</property>
<!-- indexingfilter plugin properties -->
<property>
<name>indexingfilter.order</name>
<value></value>
<description>The order by which index filters are applied.
If empty, all available index filters (as dictated by properties
plugin-includes and plugin-excludes above) are loaded and applied in system
defined order. If not empty, only named filters are loaded and applied
in given order. For example, if this property has value:
org.apache.nutch.indexer.basic.BasicIndexingFilter org.apache.nutch.indexer.more.MoreIndexingFilter
then BasicIndexingFilter is applied first, and MoreIndexingFilter second.
Filter ordering might have impact on result if one filter depends on output of
another filter.
</description>
</property>
<property>
<name>indexer.score.power</name>
<value>0.5</value>
<description>Determines the power of link analyis scores. Each
pages's boost is set to <i>score<sup>scorePower</sup></i> where
<i>score</i> is its link analysis score and <i>scorePower</i> is the
value of this parameter. This is compiled into indexes, so, when
this is changed, pages must be re-indexed for it to take
effect.</description>
</property>
<property>
<name>indexer.max.title.length</name>
<value>100</value>
<description>The maximum number of characters of a title that are indexed. A value of -1 disables this check.
</description>
</property>
<property>
<name>indexer.max.content.length</name>
<value>-1</value>
<description>The maximum number of characters of a content that are indexed.
Content beyond the limit is truncated. A value of -1 disables this check.
</description>
</property>
<property>
<name>indexer.add.domain</name>
<value>false</value>
<description>Whether to add the domain field to a NutchDocument.</description>
</property>
<property>
<name>indexer.skip.notmodified</name>
<value>false</value>
<description>Whether the indexer will skip records with a db_notmodified status.
</description>
</property>
<property>
<name>indexer.delete.robots.noindex</name>
<value>false</value>
<description>Whether the indexer will delete documents marked by robots=noindex
</description>
</property>
<property>
<name>indexer.delete.skipped.by.indexingfilter</name>
<value>false</value>
<description>Whether the indexer will delete documents that were skipped by indexing filters
</description>
</property>
<property>
<name>indexer.indexwriters.file</name>
<value>index-writers.xml</value>
<description>The configuration file for index writers.</description>
</property>
<!-- Exchanges properties -->
<property>
<name>exchanges.exchanges.file</name>
<value>exchanges.xml</value>
<description>The configuration file used by the Exchange component.</description>
</property>
<!-- URL normalizer properties -->
<property>
<name>urlnormalizer.order</name>
<value>org.apache.nutch.net.urlnormalizer.basic.BasicURLNormalizer org.apache.nutch.net.urlnormalizer.regex.RegexURLNormalizer</value>
<description>Order in which normalizers will run. If any of these isn't
activated it will be silently skipped. If other normalizers not on the
list are activated, they will run in random order after the ones
specified here are run.
</description>
</property>
<property>
<name>urlnormalizer.regex.file</name>
<value>regex-normalize.xml</value>
<description>Name of the config file used by the RegexUrlNormalizer class.
</description>
</property>
<property>
<name>urlnormalizer.loop.count</name>
<value>1</value>
<description>Optionally loop through normalizers several times, to make
sure that all transformations have been performed.
</description>
</property>
<property>
<name>urlnormalizer.basic.host.idn</name>
<value></value>
<description>Let urlnormalizer-basic
(org.apache.nutch.net.urlnormalizer.basic.BasicURLNormalizer)
normalize Internationalized Domain Names (IDNs). Possible values
are: `toAscii` - convert the Unicode form to the ASCII (Punycode)
representation, `toUnicode` - convert ASCII (Punycode) to Unicode,
or if left empty no normalization of IDNs is performed.
</description>
</property>
<property>
<name>urlnormalizer.basic.host.trim-trailing-dot</name>
<value>false</value>
<description>urlnormalizer-basic: Trim a trailing dot in host names:
`https://example.org./` is normalized to `https://example.org/`.
</description>
</property>
<!-- mime properties -->
<!--
<property>
<name>mime.types.file</name>
<value>tika-mimetypes.xml</value>
<description>Name of file in CLASSPATH containing filename extension and
magic sequence to mime types mapping information. Overrides the default Tika config
if specified.
</description>
</property>
-->
<property>
<name>mime.type.magic</name>
<value>true</value>
<description>Defines if the mime content type detector uses magic resolution.
</description>
</property>
<!-- plugin properties -->
<property>
<name>plugin.folders</name>
<value>plugins</value>
<description>Directories where nutch plugins are located. Each
element may be a relative or absolute path. If absolute, it is used
as is. If relative, it is searched for on the classpath.</description>
</property>
<property>
<name>plugin.auto-activation</name>
<value>true</value>
<description>Defines if some plugins that are not activated regarding
the plugin.includes and plugin.excludes properties must be automatically
activated if they are needed by some active plugins.
</description>
</property>
<property>
<name>plugin.includes</name>
<value>protocol-http|urlfilter-(regex|validator)|parse-(html|tika)|index-(basic|anchor)|indexer-solr|scoring-opic|urlnormalizer-(pass|regex|basic)</value>
<description>Regular expression naming plugin directory names to
include. Any plugin not matching this expression is excluded.
By default Nutch includes plugins to crawl HTML and various other
document formats via HTTP/HTTPS and indexing the crawled content
into Solr. More plugins are available to support more indexing
backends, to fetch ftp:// and file:// URLs, for focused crawling,
and many other use cases.
</description>
</property>
<property>
<name>plugin.excludes</name>
<value></value>
<description>Regular expression naming plugin directory names to exclude.
</description>
</property>
<property>
<name>urlmeta.tags</name>
<value></value>
<description>
To be used in conjunction with features introduced in NUTCH-655, which allows
for custom metatags to be injected alongside your crawl URLs. Specifying those
custom tags here will allow for their propagation into a pages outlinks, as
well as allow for them to be included as part of an index.
Values should be comma-delimited. ("tag1,tag2,tag3") Do not pad the tags with
white-space at their boundaries, if you are using anything earlier than Hadoop-0.21.
</description>
</property>
<!-- parser properties -->
<property>
<name>parse.plugin.file</name>
<value>parse-plugins.xml</value>
<description>The name of the file that defines the associations between
content-types and parsers.</description>
</property>
<property>
<name>parser.character.encoding.default</name>
<value>windows-1252</value>
<description>The character encoding to fall back to when no other information
is available</description>
</property>
<property>
<name>encodingdetector.charset.min.confidence</name>
<value>-1</value>
<description>A integer between 0-100 indicating minimum confidence value
for charset auto-detection. Any negative value disables auto-detection.
</description>
</property>
<property>
<name>parser.caching.forbidden.policy</name>
<value>content</value>
<description>If a site (or a page) requests through its robot metatags
that it should not be shown as cached content, apply this policy. Currently
three keywords are recognized: "none" ignores any "noarchive" directives.
"content" doesn't show the content, but shows summaries (snippets).
"all" doesn't show either content or summaries.</description>
</property>
<property>
<name>parser.html.impl</name>
<value>neko</value>
<description>HTML Parser implementation. Currently the following keywords
are recognized: "neko" uses NekoHTML, "tagsoup" uses TagSoup.
</description>
</property>
<property>
<name>parser.html.form.use_action</name>
<value>false</value>
<description>If true, HTML parser will collect URLs from form action
attributes. This may lead to undesirable behavior (submitting empty
forms during next fetch cycle). If false, form action attribute will
be ignored.</description>
</property>
<property>
<name>parser.html.outlinks.ignore_tags</name>
<value></value>
<description>Comma separated list of HTML tags, from which outlinks
shouldn't be extracted. Nutch takes links from: a, area, form, frame,
iframe, script, link, img. If you add any of those tags here, it
won't be taken. Default is empty list. Probably reasonable value
for most people would be "img,script,link".</description>
</property>
<property>
<name>parser.html.outlinks.htmlnode_metadata_name</name>
<value></value>
<description>if not empty, the source nodename of a found outlink will
be set in the metadata with this name into the outlink</description>
</property>
<property>
<name>parser.html.line.separators</name>
<value>article,aside,blockquote,canvas,dd,div,dl,dt,fieldset,figcaption,figure,footer,form,h1,h2,h3,h4,h5,h6,header,hr,li,main,nav,noscript,ol,output,p,pre,section,table,tfoot,ul,video</value>
<description>Comma separated list of HTML tags. Newline will be added to the
parsed text after these tages.
The default list above are the block-level HTML elements.
Tags must be in lower case.
To disable this feature, leave the list empty.</description>
</property>
<property>
<name>htmlparsefilter.order</name>
<value></value>
<description>The order by which HTMLParse filters are applied.
If empty, all available HTMLParse filters (as dictated by properties
plugin-includes and plugin-excludes above) are loaded and applied in system
defined order. If not empty, only named filters are loaded and applied
in given order.
HTMLParse filter ordering MAY have an impact
on end result, as some filters could rely on the metadata generated by a previous filter.
</description>
</property>
<property>
<name>parsefilter.naivebayes.trainfile</name>
<value>naivebayes-train.txt</value>
<description>Set the name of the file to be used for Naive Bayes training. The format will be:
Each line contains two tab separated parts
There are two columns/parts:
1. "1" or "0", "1" for relevant and "0" for irrelevant documents.
2. Text (text that will be used for training)
Each row will be considered a new "document" for the classifier.
CAUTION: Set the parser.timeout to -1 or a bigger value than 30, when using this classifier.
</description>
</property>
<property>
<name>parsefilter.naivebayes.wordlist</name>
<value>naivebayes-wordlist.txt</value>
<description>Put the name of the file you want to be used as a list of
important words to be matched in the url for the model filter. The format should be one word per line.
</description>
</property>
<property>
<name>parser.timeout</name>
<value>30</value>
<description>Timeout in seconds for the parsing of a document, otherwise treats it as an exception and
moves on the the following documents. This parameter is applied to any Parser implementation.
Set to -1 to deactivate, bearing in mind that this could cause
the parsing to crash because of a very long or corrupted document.
</description>
</property>
<property>
<name>parse.filter.urls</name>
<value>true</value>
<description>Whether the parser will filter URLs (with the configured URL filters).</description>
</property>
<property>
<name>parse.normalize.urls</name>
<value>true</value>
<description>Whether the parser will normalize URLs (with the configured URL normalizers).</description>
</property>
<property>
<name>parser.skip.truncated</name>
<value>true</value>
<description>Boolean value for whether we should skip parsing for truncated documents. By default this
property is activated due to extremely high levels of CPU which parsing can sometimes take.
</description>
</property>
<property>
<name>parser.store.text</name>
<value>true</value>
<description>If true (default value), parser will store parse text (parse_text directory within the segment).</description>
</property>
<!--
<property>
<name>tika.htmlmapper.classname</name>
<value>org.apache.tika.parser.html.IdentityHtmlMapper</value>
<description>Classname of Tika HTMLMapper to use. Influences the elements included in the DOM and hence
the behavior of the HTMLParseFilters.
</description>
</property>
-->
<property>
<name>tika.config.file</name>
<value>tika-config.xml</value>
<description>Nutch-specific Tika config file</description>
</property>
<property>
<name>tika.uppercase.element.names</name>
<value>true</value>
<description>Determines whether TikaParser should uppercase the element name while generating the DOM
for a page, as done by Neko (used per default by parse-html)(see NUTCH-1592).
</description>
</property>
<property>
<name>tika.extractor</name>
<value>none</value>
<description>
Which text extraction algorithm to use. Valid values are: boilerpipe or none.
</description>
</property>
<property>
<name>tika.extractor.boilerpipe.algorithm</name>
<value>ArticleExtractor</value>
<description>
Which Boilerpipe algorithm to use. Valid values are: DefaultExtractor, ArticleExtractor
or CanolaExtractor.
</description>
</property>
<property>
<name>tika.extractor.boilerpipe.mime.types</name>
<value>text/html,application/xhtml+xml</value>
<description>
Comma-separated list of MIME types accepted for Boilerpipe extraction,
documents of other MIME types are not passed to the Boilerpipe extractor.
</description>
</property>
<property>
<name>tika.parse.embedded</name>
<value>true</value>
<description>
Whether parse-tika shall parse embedded documents (even recursively).
</description>
</property>
<!-- urlfilter plugin properties -->
<property>
<name>urlfilter.domain.file</name>
<value>domain-urlfilter.txt</value>
<description>Name of file on CLASSPATH containing either top level domains or
hostnames used by urlfilter-domain (DomainURLFilter) plugin.</description>
</property>
<property>
<name>urlfilter.regex.file</name>
<value>regex-urlfilter.txt</value>
<description>Name of file on CLASSPATH containing regular expressions
used by urlfilter-regex (RegexURLFilter) plugin.</description>
</property>
<property>
<name>urlfilter.automaton.file</name>
<value>automaton-urlfilter.txt</value>
<description>Name of file on CLASSPATH containing regular expressions
used by urlfilter-automaton (AutomatonURLFilter) plugin.</description>
</property>
<property>
<name>urlfilter.prefix.file</name>
<value>prefix-urlfilter.txt</value>
<description>Name of file on CLASSPATH containing url prefixes
used by urlfilter-prefix (PrefixURLFilter) plugin.</description>
</property>
<property>
<name>urlfilter.suffix.file</name>
<value>suffix-urlfilter.txt</value>
<description>Name of file on CLASSPATH containing url suffixes
used by urlfilter-suffix (SuffixURLFilter) plugin.</description>
</property>
<property>
<name>urlfilter.fast.file</name>
<value>fast-urlfilter.txt</value>
<description>Name of file on CLASSPATH containing regular expressions
used by urlfilter-fast (FastURLFilter) plugin.</description>
</property>
<property>
<name>urlfilter.order</name>
<value></value>
<description>The order by which url filters are applied.
If empty, all available url filters (as dictated by properties
plugin-includes and plugin-excludes above) are loaded and applied in system
defined order. If not empty, only named filters are loaded and applied
in given order. For example, if this property has value:
org.apache.nutch.urlfilter.regex.RegexURLFilter org.apache.nutch.urlfilter.prefix.PrefixURLFilter
then RegexURLFilter is applied first, and PrefixURLFilter second.
Since all filters are AND'ed, filter ordering does not have impact
on end result, but it may have performance implication, depending
on relative expensiveness of filters.
</description>
</property>
<!-- scoring filters properties -->
<property>
<name>scoring.filter.order</name>
<value></value>
<description>The order in which scoring filters are applied. This
may be left empty (in which case all available scoring filters will
be applied in system defined order), or a space separated list of
implementation classes.
</description>
</property>
<!-- scoring-depth properties
Add 'scoring-depth' to the list of active plugins
in the parameter 'plugin.includes' in order to use it.
-->
<property>
<name>scoring.depth.max</name>
<value>1000</value>
<description>Max depth value from seed allowed by default.
Can be overridden on a per-seed basis by specifying "_maxdepth_=VALUE"
as a seed metadata. This plugin adds a "_depth_" metadatum to the pages
to track the distance from the seed it was found from.
The depth is used to prioritise URLs in the generation step so that
shallower pages are fetched first.
</description>
</property>
<!-- scoring similarity properties
Add scoring-similarity to the list of active plugins
in the parameter 'plugin.includes' in order to use it.
For more detailed information on the working of this filter
visit https://wiki.apache.org/nutch/SimilarityScoringFilter-->
<property>
<name>scoring.similarity.model</name>
<value>cosine</value>
<description>The type of similarity metric to use. Eg - cosine (which is, currently, the only available model).
Please make sure to set the model specific properties for the scoring to function properly.
Description of these properties can be found on the wiki.
</description>
</property>
<property>
<name>scoring.similarity.ngrams</name>
<value>1,1</value>
<description>Specifies the min 'n' and max 'n' in ngrams as comma-separated.
If one value is specified as 'n', it will be used for both the min 'n' and max 'n' in ngrams.
</description>
</property>
<property>
<name>cosine.goldstandard.file</name>
<value>goldstandard.txt</value>
<description>Path to the gold standard file which contains all the relevant text and terms,
pertaining to the domain.
</description>
</property>
<property>
<name>scoring.similarity.stopword.file</name>
<value>stopwords.txt</value>
<description>Name of the stopword text file. The user can specify a custom list of stop words
in a text file. Each new stopword should be on a new line.
</description>
</property>
<!-- scoring filter orphan properties -->
<property>
<name>scoring.orphan.mark.gone.after</name>
<value>2592000</value>
<description>Time in seconds after which orphaned
pages are marked as gone. Default is 30 days.
</description>
</property>
<property>
<name>scoring.orphan.mark.orphan.after</name>
<value>3456000</value>
<description>Time in seconds after which orphaned
pages are marked as gone. Default is 40 days.
</description>
</property>
<!-- language-identifier plugin properties -->
<property>
<name>lang.analyze.max.length</name>
<value>2048</value>
<description> The maximum number of bytes used to identify
the language (0 means full content analysis).
The larger is this value, the better is the analysis, but the
slowest it is.
</description>
</property>
<property>
<name>lang.extraction.policy</name>
<value>detect,identify</value>
<description>This determines when the plugin uses detection and
statistical identification mechanisms. The order in which the
detect and identify are written will determine the extraction
policy. Default case (detect,identify) means the plugin will
first try to extract language info from page headers and metadata,
if this is not successful it will try using tika language
identification. Possible values are:
detect
identify
detect,identify
identify,detect
</description>
</property>
<property>
<name>lang.identification.only.certain</name>
<value>false</value>
<description>If set to true with lang.extraction.policy containing identify,
the language code returned by Tika will be assigned to the document ONLY
if it is deemed certain by Tika.
</description>
</property>
<property>
<name>lang.index.languages</name>
<value></value>
<description>If not empty, should be a comma separated list of language codes.
Only documents with one of these language codes will be indexed.
"unknown" is a valid language code, will match documents where language
detection failed.
</description>
</property>
<!-- index-jexl-filter plugin properties -->
<property>
<name>index.jexl.filter</name>
<value></value>
<description> A JEXL expression. If it evaluates to false,
the document will not be indexed.
Available primitives in the JEXL context:
* status, fetchTime, modifiedTime, retries, interval, score, signature, url, text, title
Available objects in the JEXL context:
* httpStatus - contains majorCode, minorCode, message
* documentMeta, contentMeta, parseMeta - contain all the Metadata properties.
each property value is always an array of Strings (so if you expect one value, use [0])
* doc - contains all the NutchFields from the NutchDocument.
each property value is always an array of Objects.
</description>
</property>
<!-- index-static plugin properties -->
<property>
<name>index.static</name>
<value></value>
<description>
Used by plugin index-static to adds fields with static data at indexing time.
You can specify a comma-separated list of fieldname:fieldcontent per Nutch job.
Each fieldcontent can have multiple values separated by space, e.g.,
field1:value1.1 value1.2 value1.3,field2:value2.1 value2.2 ...
It can be useful when collections can't be created by URL patterns,
like in subcollection, but on a job-basis.
</description>
</property>
<property>
<name>index.static.fieldsep</name>
<value>,</value>
<description>
Used by plugin index-static to parse the property index.static. Default: comma.
This delimiter is used to separate individual field specifications in the property.
</description>
</property>
<property>
<name>index.static.keysep</name>
<value>:</value>
<description>
Used by plugin index-static to parse the property index.static. Default: colon.
This delimiter is used to separate the field name from the field value in the field specification.
</description>
</property>
<property>
<name>index.static.valuesep</name>
<value> </value>
<description>
Used by plugin index-static to parse the property index.static. Default: space.
This delimiter is used to separate multiple field values in the value setting of the field specification.
</description>
</property>
<!-- index-metadata plugin properties -->
<property>
<name>index.parse.md</name>
<value>metatag.description,metatag.keywords</value>
<description>
Comma-separated list of keys to be taken from the parse metadata to generate fields.
Can be used e.g. for 'description' or 'keywords' provided that these values are generated
by a parser (see parse-metatags plugin)
</description>
</property>
<property>
<name>index.content.md</name>
<value></value>
<description>
Comma-separated list of keys to be taken from the content metadata to generate fields.
</description>
</property>
<property>
<name>index.db.md</name>
<value></value>
<description>
Comma-separated list of keys to be taken from the crawldb metadata to generate fields.
Can be used to index values propagated from the seeds with the plugin urlmeta
</description>
</property>
<property>
<name>index.metadata.separator</name>
<value></value>
<description>
Separator to use if you want to index multiple values for a given field. Leave empty to
treat each value as a single value.
</description>
</property>
<!-- index-geoip plugin properties -->
<property>
<name>index.geoip.usage</name>
<value>insightsService</value>
<description>
A string representing the information source to be used for GeoIP information
association. Either enter 'cityDatabase', 'connectionTypeDatabase',
'domainDatabase', 'ispDatabase' or 'insightsService'. If you wish to use any one of the
Database options, you should make one of GeoIP2-City.mmdb, GeoIP2-Connection-Type.mmdb,
GeoIP2-Domain.mmdb or GeoIP2-ISP.mmdb files respectively available on the classpath and
available at runtime.
</description>
</property>
<property>
<name>index.geoip.userid</name>
<value></value>
<description>
The userId associated with the GeoIP2 Precision Services account.
</description>
</property>
<property>
<name>index.geoip.licensekey</name>
<value></value>
<description>
The license key associated with the GeoIP2 Precision Services account.
</description>
</property>
<property>
<name>index.replace.regexp</name>
<value/>
<description>Allows indexing-time regexp replace manipulation of metadata fields.
The format of the property is a list of regexp replacements, one line per field being
modified. Include index-replace in your plugin.includes.
Example:
hostmatch=.*somedomain.com
fldname1=/regexp/replacement/flags
fldname2=/regexp/replacement/flags
Field names would be one of those from https://wiki.apache.org/nutch/IndexStructure.
See https://wiki.apache.org/nutch/IndexReplace for further details.
</description>
</property>
<!-- parse-metatags plugin properties -->
<property>
<name>metatags.names</name>
<value>description,keywords</value>
<description> Names of the metatags to extract, separated by ','.
Use '*' to extract all metatags. Prefixes the names with 'metatag.'
in the parse-metadata. For instance to index description and keywords,
you need to activate the plugin index-metadata and set the value of the
parameter 'index.parse.md' to 'metatag.description,metatag.keywords'.
</description>
</property>
<!-- Temporary Hadoop 0.17.x workaround. -->
<property>
<name>hadoop.job.history.user.location</name>
<value>${hadoop.log.dir}/history/user</value>
<description>Hadoop 0.17.x comes with a default setting to create
user logs inside the output path of the job. This breaks some
Hadoop classes, which expect the output to contain only
part-XXXXX files. This setting changes the output to a
subdirectory of the regular log directory.
</description>
</property>
<property>
<name>io.serializations</name>
<value>org.apache.hadoop.io.serializer.WritableSerialization,org.apache.hadoop.io.serializer.JavaSerialization</value>
<!-- org.apache.hadoop.io.serializer.avro.AvroSpecificSerialization,
org.apache.hadoop.io.serializer.avro.AvroReflectSerialization,
org.apache.hadoop.io.serializer.avro.AvroGenericSerialization, -->
<description>A list of serialization classes that can be used for
obtaining serializers and deserializers.</description>
</property>
<!-- linkrank scoring properties -->
<property>
<name>link.ignore.internal.host</name>
<value>true</value>
<description>Ignore outlinks to the same hostname.</description>
</property>
<property>
<name>link.ignore.internal.domain</name>
<value>true</value>
<description>Ignore outlinks to the same domain.</description>
</property>
<property>
<name>link.ignore.limit.page</name>
<value>true</value>
<description>Limit to only a single outlink to the same page.</description>
</property>
<property>
<name>link.ignore.limit.domain</name>
<value>true</value>
<description>Limit to only a single outlink to the same domain.</description>
</property>
<property>
<name>link.analyze.num.iterations</name>
<value>10</value>
<description>The number of LinkRank iterations to run.</description>
</property>
<property>
<name>link.analyze.initial.score</name>
<value>1.0f</value>
<description>The initial score.</description>
</property>
<property>
<name>link.analyze.damping.factor</name>
<value>0.85f</value>
<description>The damping factor.</description>
</property>
<property>
<name>link.delete.gone</name>
<value>false</value>
<description>Whether to delete gone pages from the web graph.</description>
</property>
<property>
<name>link.loops.depth</name>
<value>2</value>
<description>The depth for the loops algorithm.</description>
</property>
<property>
<name>link.score.updater.clear.score</name>
<value>0.0f</value>
<description>The default score for URL's that are not in the web graph.</description>
</property>
<property>
<name>mapreduce.fileoutputcommitter.marksuccessfuljobs</name>
<value>false</value>
<description>Hadoop >= 0.21 generates SUCCESS files in the output which can crash
the readers. This should not be an issue once Nutch is ported to the new MapReduce API
but for now this parameter should prevent such cases.
</description>
</property>
<!-- subcollection properties -->
<property>
<name>subcollection.default.fieldname</name>
<value>subcollection</value>
<description>
The default field name for the subcollections.
</description>
</property>
<property>
<name>subcollection.case.insensitive</name>
<value>false</value>
<description>
Whether the URL prefixes are to be treated case insensitive.
</description>
</property>
<!-- Headings plugin properties -->
<property>
<name>headings</name>
<value>h1,h2</value>
<description>Comma separated list of headings to retrieve from the document</description>
</property>
<property>
<name>headings.multivalued</name>
<value>false</value>
<description>Whether to support multivalued headings.</description>
</property>
<!-- mimetype-filter plugin properties -->
<property>
<name>mimetype.filter.file</name>
<value>mimetype-filter.txt</value>
<description>
The configuration file for the mimetype-filter plugin. This file contains
the rules used to allow or deny the indexing of certain documents.
</description>
</property>
<!-- plugin properties that applies to lib-selenium, protocol-selenium,
protocol-interactiveselenium, lib-htmlunit, protocol-htmlunit -->
<property>
<name>page.load.delay</name>
<value>3</value>
<description>
The delay in seconds to use when loading a page with htmlunit or selenium.
</description>
</property>
<property>
<name>take.screenshot</name>
<value>false</value>
<description>
Boolean property determining whether the protocol-htmlunit
WebDriver should capture a screenshot of the URL. If set to
true remember to define the 'screenshot.location'
property as this determines the location screenshots should be
persisted to on HDFS. If that property is not set, screenshots
are simply discarded.
</description>
</property>
<property>
<name>screenshot.location</name>
<value></value>
<description>
The location on disk where a URL screenshot should be saved
to if the 'take.screenshot' property is set to true.
By default this is null, in this case screenshots held in memory
are simply discarded.
</description>
</property>
<!-- lib-htmlunit plugin properties; applies to protocol-htmlunit -->
<property>
<name>htmlunit.enable.javascript</name>
<value>true</value>
<description>
A Boolean value representing if javascript should
be enabled or disabled when using htmlunit. The default value is enabled.
</description>
</property>
<property>
<name>htmlunit.javascript.timeout</name>
<value>3500</value>
<description>
The timeout in milliseconds when loading javascript with lib-htmlunit. This
setting is used by protocol-htmlunit since they depending on
lib-htmlunit for fetching.
</description>
</property>
<property>
<name>htmlunit.enable.css</name>
<value>false</value>
<description>
A Boolean value representing if CSS should
be enabled or disabled when using htmlunit. The default value is disabled.
</description>
</property>
<!-- protocol-selenium plugin properties -->
<property>
<name>selenium.driver</name>
<value>firefox</value>
<description>
A String value representing the flavour of Selenium
WebDriver() to use. Currently the following options
exist - 'firefox', 'chrome', 'safari', 'opera' and 'remote'.
If 'remote' is used it is essential to also set correct properties for
'selenium.hub.port', 'selenium.hub.path', 'selenium.hub.host',
'selenium.hub.protocol', 'selenium.grid.driver', 'selenium.grid.binary'
and 'selenium.enable.headless'.
</description>
</property>
<property>
<name>selenium.hub.port</name>
<value>4444</value>
<description>Selenium Hub Location connection port</description>
</property>
<property>
<name>selenium.hub.path</name>
<value>/wd/hub</value>
<description>Selenium Hub Location connection path</description>
</property>
<property>
<name>selenium.hub.host</name>
<value>localhost</value>
<description>Selenium Hub Location connection host</description>
</property>
<property>
<name>selenium.hub.protocol</name>
<value>http</value>
<description>Selenium Hub Location connection protocol</description>
</property>
<property>
<name>selenium.grid.driver</name>
<value>firefox</value>
<description>A String value representing the flavour of Selenium
WebDriver() used on the selenium grid. We must set `selenium.driver` to `remote` first.
Currently the following options
exist - 'firefox', 'chrome', 'random' </description>
</property>
<property>
<name>selenium.grid.binary</name>
<value></value>
<description>A String value representing the path to the browser binary
location for each node
</description>
</property>
<!-- headless options for Firefox and Chrome-->
<property>
<name>selenium.enable.headless</name>
<value>false</value>
<description>A Boolean value representing the headless option
for Firefix and Chrome drivers
</description>
</property>
<!-- selenium firefox configuration;
applies to protocol-selenium and protocol-interactiveselenium plugins -->
<property>
<name>selenium.firefox.allowed.hosts</name>
<value>localhost</value>
<description>A String value representing the allowed hosts preference
according to the operating system hosts file (Example - /etc/hosts in Unix).
Currently this option exist for - 'firefox' </description>
</property>
<property>
<name>selenium.firefox.binary.timeout</name>
<value>45</value>
<description>A Long value representing the timeout value
for firefox to be available for command execution. The value is in seconds.
Currently this option exist for - 'firefox' </description>
</property>
<property>
<name>selenium.firefox.enable.flash</name>
<value>false</value>
<description>A Boolean value representing if flash should
be enabled or disabled. The default value is disabled.
Currently this option exist for - 'firefox' </description>
</property>
<property>
<name>selenium.firefox.load.image</name>
<value>1</value>
<description>An Integer value representing the restriction on
loading images. The default value is no restriction i.e. load all images.
Other options are:
1: Load all images, regardless of origin
2: Block all images
3: Prevent third-party images from loading
Currently this option exist for - 'firefox' </description>
</property>
<property>
<name>selenium.firefox.load.stylesheet</name>
<value>1</value>
<description>An Integer value representing the restriction on
loading stylesheet. The default value is no restriction i.e. load
all stylesheet.
Other options are:
1: Load all stylesheet
2: Block all stylesheet
Currently this option exist for - 'firefox' </description>
</property>
<!-- selenium chrome configurations -->
<property>
<name>webdriver.chrome.driver</name>
<value>/root/chromedriver</value>
<description>The path to the ChromeDriver binary</description>
</property>
<!-- end of selenium chrome configurations -->
<!-- protocol-interactiveselenium configuration -->
<property>
<name>interactiveselenium.handlers</name>
<value>DefaultHandler</value>
<description>
A comma separated list of Selenium handlers that should be run for a given
URL. The DefaultHandler causes the same functionality as protocol-selenium.
Custom handlers can be implemented in the plugin package and included here.
</description>
</property>
<property>
<name>store.http.request</name>
<value>false</value>
<description>
Store the raw request made by Nutch, required to use the CommonCrawlDataDumper
tool for the WARC format.
</description>
</property>
<property>
<name>store.http.headers</name>
<value>false</value>
<description>
Store the raw headers received by Nutch from the server, required to use the
CommonCrawlDataDumper tool for the WARC format.
</description>
</property>
<!-- index-links plugin -->
<property>
<name>index.links.outlinks.host.ignore</name>
<value>false</value>
<description>
Ignore outlinks that point out to the same host as the URL being indexed.
By default all outlinks are indexed. If db.ignore.internal.links is true (default
value), this setting does nothing since the internal links are already
ignored.
</description>
</property>
<property>
<name>index.links.inlinks.host.ignore</name>
<value>false</value>
<description>
Ignore inlinks coming from the same host as the URL being indexed. By default
all inlinks are indexed. If db.ignore.internal.links is true (default
value), this setting does nothing since the internal links are already
ignored.
</description>
</property>
<property>
<name>index.links.hosts.only</name>
<value>false</value>
<description>
This force the index-links plugin to only index the host portion of the inlinks
or outlinks.
</description>
</property>
<!-- HostDB settings -->
<property>
<name>hostdb.recheck.interval</name>
<value>86400000</value>
<description>
Interval between rechecks in milliseconds. Default is one week. Recheck
interval is multiplied by the number of DNS lookup failures for a given
host.
</description>
</property>
<property>
<name>hostdb.purge.failed.hosts.threshold</name>
<value>3</value>
<description>
If hosts have more failed DNS lookups than this threshold, they are
removed from the HostDB. Hosts can, of course, return if they are still
present in the CrawlDB.
</description>
</property>
<property>
<name>hostdb.num.resolvers.threads</name>
<value>25</value>
<description>
Number of resolver threads per reducer. Make sure your DNS resolver is
capable of handling this value multiplied by the number of reducers.
</description>
</property>
<property>
<name>hostdb.check.failed</name>
<value>true</value>
<description>
True if hosts for which DNS lookup failed are eligible for recheck. If
false, hosts that failed DNS lookup more than 0 times are not eligible
for DNS lookup.
</description>
</property>
<property>
<name>hostdb.check.new</name>
<value>true</value>
<description>
True if newly discovered hosts eligible for DNS lookup check. If false,
hosts that are just added to the HostDB are not eligible for DNS lookup.
</description>
</property>
<property>
<name>hostdb.check.known</name>
<value>true</value>
<description>
True if newly already known hosts eligible for DNS lookup check. If false,
known hosts are not eligible for DNS lookup.
</description>
</property>
<property>
<name>hostdb.force.check</name>
<value>false</value>
<description>
If true hosts are checked regardless of their respective recheck
intervals or status.
</description>
</property>
<property>
<name>hostdb.url.filter</name>
<value>false</value>
<description>
Whether the records are to be passed through configured filters.
</description>
</property>
<property>
<name>hostdb.url.normalize</name>
<value>false</value>
<description>
Whether the records are to be passed through configured normalizers.
</description>
</property>
<property>
<name>hostdb.numeric.fields</name>
<value>_rs_</value>
<description>
Comma-separated list of CrawlDatum metadata fields for which aggregations are needed.
</description>
</property>
<property>
<name>hostdb.string.fields</name>
<value>Content-Type</value>
<description>
Comma-separated list of CrawlDatum metadata fields for which sums are needed.
</description>
</property>
<property>
<name>hostdb.percentiles</name>
<value>50,75,95,99</value>
<description>
Comma-separated list of percentiles that must be calculated for all numeric
field aggregations. Host metadata will contain fields for each percentile.
</description>
</property>
<!-- publisher properties
Do not forget to add the name of your publisher implementation
in plugin.includes ex- publish-rabbitmq -->
<property>
<name>publisher.queue.type</name>
<value></value>
<description>
Choose the type of Queue being used (ex - RabbitMQ, ActiveMq, Kafka, etc).
Currently there exists an implemtation for RabbitMQ producer.
</description>
</property>
<property>
<name>publisher.order</name>
<value></value>
<description>
The order in which the publisher queues would be loaded
</description>
</property>
<!-- RabbitMQ publisher properties -->
<property>
<name>rabbitmq.publisher.server.uri</name>
<value>amqp://guest:guest@localhost:5672/</value>
<description>
URI with connection parameters in the form
amqp://username:password@hostname:port/virtualHost
where:
username is the username for RabbitMQ server.
password is the password for RabbitMQ server.
hostname is where the RabbitMQ server is running.
port is where the RabbitMQ server is listening.
virtualHost is where where the exchange is and the user has access.
</description>
</property>
<property>
<name>rabbitmq.publisher.binding</name>
<value>false</value>
<description>
Whether the relationship between an exchange and a queue is created
automatically. Default "false".
NOTE: Binding between exchanges is not supported.
</description>
</property>
<property>
<name>rabbitmq.publisher.binding.arguments</name>
<value></value>
<description>
Arguments used in binding. It must have the form key1=value1,key2=value2.
This value is only used when the exchange's type is headers and
the value of 'rabbitmq.publisher.binding' property is true. In other cases
is ignored.
</description>
</property>
<property>
<name>rabbitmq.publisher.exchange.name</name>
<value></value>
<description>
Name for the exchange where the messages will be sent. Default "".
</description>
</property>
<property>
<name>rabbitmq.publisher.exchange.options</name>
<value>type=direct,durable=true</value>
<description>
Options used when the exchange is created.
Only used when the value of 'rabbitmq.publisher.binding' property is true.
Default "type=direct,durable=true".
</description>
</property>
<property>
<name>rabbitmq.publisher.queue.name</name>
<value>nutch.events.queue</value>
<description>
Name of the queue used to create the binding. Default "nutch.queue".
Only used when the value of 'rabbitmq.publisher.binding' property is true.
</description>
</property>
<property>
<name>rabbitmq.publisher.queue.options</name>
<value>durable=true,exclusive=false,auto-delete=false</value>
<description>
Options used when the queue is created.
Only used when the value of 'rabbitmq.publisher.binding' property is true.
Default "durable=true,exclusive=false,auto-delete=false".
It must have the form
durable={durable},exclusive={exclusive},auto-delete={auto-delete},arguments={arguments}
where:
durable is true or false
exclusive is true or false
auto-delete is true or false
arguments must be the for {key1:value1;key2:value2}
</description>
</property>
<property>
<name>rabbitmq.publisher.routingkey</name>
<value></value>
<description>
The routing key used to publish messages to specific queues.
It is only used when the exchange type is "topic" or "direct". Default
is the value of 'rabbitmq.publisher.queue.name' property.
</description>
</property>
<property>
<name>rabbitmq.publisher.headers.static</name>
<value></value>
<description>
Headers to add to each message. It must have the form key1=value1,key2=value2.
</description>
</property>
<!-- sitemap properties -->
<property>
<name>sitemap.strict.parsing</name>
<value>true</value>
<description>
If true (default) the Sitemap parser rejects URLs not sharing the same
prefix with the sitemap: a sitemap `http://example.com/catalog/sitemap.xml'
may only contain URLs starting with `http://example.com/catalog/'.
All other URLs are skipped. If false the parser will allow any URLs contained
in the sitemap.
</description>
</property>
<property>
<name>sitemap.url.filter</name>
<value>true</value>
<description>
Filter URLs from sitemaps.
</description>
</property>
<property>
<name>sitemap.url.normalize</name>
<value>true</value>
<description>
Normalize URLs from sitemaps.
</description>
</property>
<property>
<name>sitemap.url.default.sitemap.xml</name>
<value>true</value>
<description>
Always try &lt;host&gt;/sitemap.xml root even if no sitemap
is announced in /robots.txt.
</description>
</property>
<property>
<name>sitemap.url.overwrite.existing</name>
<value>false</value>
<description>
If true, the record's existing modified time, interval and score are
overwritten by the information in the sitemap. WARNING: overwriting
these values may have unexpected effects on what is crawled. Use this
only if you can trust the sitemap and if the values in the sitemap do
fit with your crawler configuration.
</description>
</property>
<property>
<name>sitemap.redir.max</name>
<value>3</value>
<description>
Maximum number of redirects to follow.
</description>
</property>
<property>
<name>sitemap.size.max</name>
<value>52428800</value>
<description>
Maximum sitemap size in bytes.
</description>
</property>
</configuration>