I use
<bool name="overwriteDupes">true</bool>
and a different field than ID to control duplication. This is about
bibliographic data coming from different sources with different IDs
which may have the same content...
I attached solrconfig.xml if you want to take a look.
Thanks a lot!
Markus
Markus Jelsma schrieb:
What's your solrconfig? No deduplication is overwritesDedupes = false and signature field is other than doc ID field (unique)
-----Original message-----
From: Markus Fischer <i...@flyingfischer.ch>
Sent: Thu 13-05-2010 17:01
To: solr-user@lucene.apache.org;
Subject: Config issue for deduplication
I am trying to configure automatic deduplication for SOLR 1.4 in Vufind.
I followed:
http://wiki.apache.org/solr/Deduplication
Actually nothing happens. All records are being imported without any
deduplication.
What am I missing?
Thanks
Markus
I did:
- create a duplicated set of records, only shifted their ID by a fixed
number
---
solrconfig.xml
<requestHandler name="/update" class="solr.XmlUpdateRequestHandler" >
<lst name="defaults">
<str name="update.processor">dedupe</str>
</lst>
</requestHandler>
<updateRequestProcessorChain name="dedupe">
<processor
class="org.apache.solr.update.processor.SignatureUpdateProcessorFactory">
<bool name="enabled">true</bool>
<bool name="overwriteDupes">true</bool>
<str name="signatureField">dedupeHash</str>
<str name="fields">reference,issn</str>
<str
name="signatureClass">org.apache.solr.update.processor.Lookup3Signature</str>
</processor>
<processor class="solr.LogUpdateProcessorFactory" />
<processor class="solr.RunUpdateProcessorFactory" />
</updateRequestProcessorChain>
---
In schema.xml I added the field
<field name="dedupeHash" type="string" stored="true" indexed="true"
multiValued="false" />
--
If I look at the created field "dedupeHash" it seems to be empty...!?
<?xml version="1.0" encoding="UTF-8" ?>
<!--
Licensed to the Apache Software Foundation (ASF) under one or more
contributor license agreements. See the NOTICE file distributed with
this work for additional information regarding copyright ownership.
The ASF licenses this file to You under the Apache License, Version 2.0
(the "License"); you may not use this file except in compliance with
the License. You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
-->
<config>
<!-- Set this to 'false' if you want solr to continue working after it has
encountered an severe configuration error. In a production environment,
you may want solr to keep working even if one handler is mis-configured.
You may also set this to false using by setting the system property:
-Dsolr.abortOnConfigurationError=false
-->
<abortOnConfigurationError>${solr.abortOnConfigurationError:false}</abortOnConfigurationError>
<!-- Used to specify an alternate directory to hold all index data
other than the default ./data under the Solr home.
If replication is in use, this should match the replication configuration. -->
<dataDir>${solr.solr.home:./solr}/biblio</dataDir>
<indexDefaults>
<!-- Values here affect all index writers and act as a default unless overridden. -->
<useCompoundFile>false</useCompoundFile>
<mergeFactor>10</mergeFactor>
<!--
If both ramBufferSizeMB and maxBufferedDocs is set, then Lucene will flush based on whichever limit is hit first.
-->
<!--<maxBufferedDocs>1000</maxBufferedDocs>-->
<!-- Tell Lucene when to flush documents to disk.
Giving Lucene more memory for indexing means faster indexing at the cost of more RAM
If both ramBufferSizeMB and maxBufferedDocs is set, then Lucene will flush based on whichever limit is hit first.
-->
<ramBufferSizeMB>32</ramBufferSizeMB>
<maxMergeDocs>2147483647</maxMergeDocs>
<maxFieldLength>10000</maxFieldLength>
<writeLockTimeout>1000</writeLockTimeout>
<commitLockTimeout>10000</commitLockTimeout>
<!--
Expert: Turn on Lucene's auto commit capability.
TODO: Add recommendations on why you would want to do this.
NOTE: Despite the name, this value does not have any relation to Solr's autoCommit functionality
-->
<!--<luceneAutoCommit>false</luceneAutoCommit>-->
<!--
Expert:
The Merge Policy in Lucene controls how merging is handled by Lucene. The default in 2.3 is the LogByteSizeMergePolicy, previous
versions used LogDocMergePolicy.
LogByteSizeMergePolicy chooses segments to merge based on their size. The Lucene 2.2 default, LogDocMergePolicy chose when
to merge based on number of documents
Other implementations of MergePolicy must have a no-argument constructor
-->
<!--<mergePolicy>org.apache.lucene.index.LogByteSizeMergePolicy</mergePolicy>-->
<!--
Expert:
The Merge Scheduler in Lucene controls how merges are performed. The ConcurrentMergeScheduler (Lucene 2.3 default)
can perform merges in the background using separate threads. The SerialMergeScheduler (Lucene 2.2 default) does not.
-->
<!--<mergeScheduler>org.apache.lucene.index.ConcurrentMergeScheduler</mergeScheduler>-->
<!--
This option specifies which Lucene LockFactory implementation to use.
single = SingleInstanceLockFactory - suggested for a read-only index
or when there is no possibility of another process trying
to modify the index.
native = NativeFSLockFactory
simple = SimpleFSLockFactory
(For backwards compatibility with Solr 1.2, 'simple' is the default
if not specified.)
-->
<lockType>single</lockType>
</indexDefaults>
<mainIndex>
<!-- options specific to the main on-disk lucene index -->
<useCompoundFile>false</useCompoundFile>
<ramBufferSizeMB>32</ramBufferSizeMB>
<mergeFactor>10</mergeFactor>
<!-- Deprecated -->
<!--<maxBufferedDocs>1000</maxBufferedDocs>-->
<maxMergeDocs>2147483647</maxMergeDocs>
<maxFieldLength>10000</maxFieldLength>
<!-- If true, unlock any held write or commit locks on startup.
This defeats the locking mechanism that allows multiple
processes to safely access a lucene index, and should be
used with care.
This is not needed if lock type is 'none' or 'single'
-->
<unlockOnStartup>false</unlockOnStartup>
<!--
Custom deletion policies can specified here. The class must
implement org.apache.lucene.index.IndexDeletionPolicy.
http://lucene.apache.org/java/2_3_2/api/org/apache/lucene/index/IndexDeletionPolicy.html
The standard Solr IndexDeletionPolicy implementation supports deleting
index commit points on number of commits, age of commit point and
optimized status.
The latest commit point should always be preserved regardless
of the criteria.
-->
<deletionPolicy class="solr.SolrDeletionPolicy">
<!-- Keep only optimized commit points -->
<str name="keepOptimizedOnly">false</str>
<!-- The maximum number of commit points to be kept -->
<str name="maxCommitsToKeep">1</str>
<!--
Delete all commit points once they have reached the given age.
Supports DateMathParser syntax e.g.
<str name="maxCommitAge">30MINUTES</str>
<str name="maxCommitAge">1DAY</str>
-->
</deletionPolicy>
</mainIndex>
<!-- Enables JMX if and only if an existing MBeanServer is found, use
this if you want to configure JMX through JVM parameters. Remove
this to disable exposing Solr configuration and statistics to JMX.
If you want to connect to a particular server, specify the agentId
e.g. <jmx agentId="myAgent" />
If you want to start a new MBeanServer, specify the serviceUrl
e.g <jmx serviceurl="service:jmx:rmi:///jndi/rmi://localhost:9999/solr" />
For more details see http://wiki.apache.org/solr/SolrJmx
-->
<jmx />
<!-- the default high-performance update handler -->
<updateHandler class="solr.DirectUpdateHandler2">
<!-- A prefix of "solr." for class names is an alias that
causes solr to search appropriate packages, including
org.apache.solr.(search|update|request|core|analysis)
-->
<!-- Perform a <commit/> automatically under certain conditions:
maxDocs - number of updates since last commit is greater than this
maxTime - oldest uncommited update (in ms) is this long ago
-->
<autoCommit>
<maxDocs>10000</maxDocs>
<maxTime>20000</maxTime>
</autoCommit>
<!-- The RunExecutableListener executes an external command.
exe - the name of the executable to run
dir - dir to use as the current working directory. default="."
wait - the calling thread waits until the executable returns. default="true"
args - the arguments to pass to the program. default=nothing
env - environment variables to set. default=nothing
-->
<!-- A postCommit event is fired after every commit or optimize command
<listener event="postCommit" class="solr.RunExecutableListener">
<str name="exe">solr/bin/snapshooter</str>
<str name="dir">.</str>
<bool name="wait">true</bool>
<arr name="args"> <str>arg1</str> <str>arg2</str> </arr>
<arr name="env"> <str>MYVAR=val1</str> </arr>
</listener>
-->
<!-- A postOptimize event is fired only after every optimize command, useful
in conjunction with index distribution to only distribute optimized indicies
<listener event="postOptimize" class="solr.RunExecutableListener">
<str name="exe">snapshooter</str>
<str name="dir">solr/bin</str>
<bool name="wait">true</bool>
</listener>
-->
</updateHandler>
<query>
<!-- Maximum number of clauses in a boolean query... can affect
range or prefix queries that expand to big boolean
queries. An exception is thrown if exceeded. -->
<maxBooleanClauses>1024</maxBooleanClauses>
<!-- Cache used by SolrIndexSearcher for filters (DocSets),
unordered sets of *all* documents that match a query.
When a new searcher is opened, its caches may be prepopulated
or "autowarmed" using data from caches in the old searcher.
autowarmCount is the number of items to prepopulate. For LRUCache,
the autowarmed items will be the most recently accessed items.
Parameters:
class - the SolrCache implementation (currently only LRUCache)
size - the maximum number of entries in the cache
initialSize - the initial capacity (number of entries) of
the cache. (seel java.util.HashMap)
autowarmCount - the number of entries to prepopulate from
and old cache.
-->
<filterCache
class="solr.FastLRUCache"
size="300000"
initialSize="300000"
autowarmCount="50000"/>
<!-- queryResultCache caches results of searches - ordered lists of
document ids (DocList) based on a query, a sort, and the range
of documents requested. -->
<queryResultCache
class="solr.LRUCache"
size="100000"
initialSize="100000"
autowarmCount="50000"/>
<!-- documentCache caches Lucene Document objects (the stored fields for each document).
Since Lucene internal document ids are transient, this cache will not be autowarmed. -->
<documentCache
class="solr.LRUCache"
size="50000"
initialSize="50000"
autowarmCount="10000"/>
<!-- If true, stored fields that are not requested will be loaded lazily.
This can result in a significant speed improvement if the usual case is to
not load all stored fields, especially if the skipped fields are large compressed
text fields.
-->
<enableLazyFieldLoading>true</enableLazyFieldLoading>
<!-- Example of a generic cache. These caches may be accessed by name
through SolrIndexSearcher.getCache(),cacheLookup(), and cacheInsert().
The purpose is to enable easy caching of user/application level data.
The regenerator argument should be specified as an implementation
of solr.search.CacheRegenerator if autowarming is desired. -->
<!--
<cache name="myUserCache"
class="solr.LRUCache"
size="4096"
initialSize="1024"
autowarmCount="1024"
regenerator="org.mycompany.mypackage.MyRegenerator"
/>
-->
<!-- An optimization that attempts to use a filter to satisfy a search.
If the requested sort does not include score, then the filterCache
will be checked for a filter matching the query. If found, the filter
will be used as the source of document ids, and then the sort will be
applied to that.
<useFilterForSortedQuery>true</useFilterForSortedQuery>
-->
<!-- An optimization for use with the queryResultCache. When a search
is requested, a superset of the requested number of document ids
are collected. For example, if a search for a particular query
requests matching documents 10 through 19, and queryWindowSize is 50,
then documents 0 through 49 will be collected and cached. Any further
requests in that range can be satisfied via the cache. -->
<queryResultWindowSize>50</queryResultWindowSize>
<!-- Maximum number of documents to cache for any entry in the
queryResultCache. -->
<queryResultMaxDocsCached>200</queryResultMaxDocsCached>
<!-- This entry enables an int hash representation for filters (DocSets)
when the number of items in the set is less than maxSize. For smaller
sets, this representation is more memory efficient, more efficient to
iterate over, and faster to take intersections. -->
<HashDocSet maxSize="3000" loadFactor="0.75"/>
<!-- a newSearcher event is fired whenever a new searcher is being prepared
and there is a current searcher handling requests (aka registered). -->
<!-- QuerySenderListener takes an array of NamedList and executes a
local query request for each NamedList in sequence. -->
<listener event="newSearcher" class="solr.QuerySenderListener">
<arr name="queries">
<lst>
<str name="q">science art business engineering history</str>
<str name="start">0</str>
<str name="rows">10</str>
</lst>
</arr>
</listener>
<!-- a firstSearcher event is fired whenever a new searcher is being
prepared but there is no current registered searcher to handle
requests or to gain autowarming data from. -->
<listener event="firstSearcher" class="solr.QuerySenderListener">
<arr name="queries">
<lst>
<str name="q">science art business engineering history</str>
<str name="facet.field">format</str>
<str name="fq">format:book</str>
</lst>
</arr>
</listener>
<!-- If a search request comes in and there is no current registered searcher,
then immediately register the still warming searcher and use it. If
"false" then all requests will block until the first searcher is done
warming. -->
<useColdSearcher>false</useColdSearcher>
<!-- Maximum number of searchers that may be warming in the background
concurrently. An error is returned if this limit is exceeded. Recommend
1-2 for read-only slaves, higher for masters w/o cache warming. -->
<maxWarmingSearchers>2</maxWarmingSearchers>
</query>
<!--
Let the dispatch filter handler /select?qt=XXX
handleSelect=true will use consistent error handling for /select and /update
handleSelect=false will use solr1.1 style error formatting
-->
<requestDispatcher handleSelect="true" >
<!--Make sure your system has some authentication before enabling remote streaming! -->
<requestParsers enableRemoteStreaming="true" multipartUploadLimitInKB="2048000" />
<!-- Set HTTP caching related parameters (for proxy caches and clients).
To get the behaviour of Solr 1.2 (ie: no caching related headers)
use the never304="true" option and do not specify a value for
<cacheControl>
-->
<!-- <httpCaching never304="true"> -->
<httpCaching lastModifiedFrom="openTime"
etagSeed="Solr">
<!-- lastModFrom="openTime" is the default, the Last-Modified value
(and validation against If-Modified-Since requests) will all be
relative to when the current Searcher was opened.
You can change it to lastModFrom="dirLastMod" if you want the
value to exactly corrispond to when the physical index was last
modified.
etagSeed="..." is an option you can change to force the ETag
header (and validation against If-None-Match requests) to be
differnet even if the index has not changed (ie: when making
significant changes to your config file)
lastModifiedFrom and etagSeed are both ignored if you use the
never304="true" option.
-->
<!-- If you include a <cacheControl> directive, it will be used to
generate a Cache-Control header, as well as an Expires header
if the value contains "max-age="
By default, no Cache-Control header is generated.
You can use the <cacheControl> option even if you have set
never304="true"
-->
<!-- <cacheControl>max-age=30, public</cacheControl> -->
</httpCaching>
</requestDispatcher>
<!-- requestHandler plugins... incoming queries will be dispatched to the
correct handler based on the path or the qt (query type) param.
Names starting with a '/' are accessed with the a path equal to the
registered name. Names without a leading '/' are accessed with:
http://host/app/select?qt=name
If no qt is defined, the requestHandler that declares default="true"
will be used.
-->
<requestHandler name="standard" class="solr.StandardRequestHandler" default="true">
<!-- default values for query parameters -->
<lst name="defaults">
<str name="echoParams">explicit</str>
<!--
<int name="rows">10</int>
<str name="fl">*</str>
<str name="version">2.1</str>
-->
<str name="spellcheck.extendedResults">true</str>
<str name="spellcheck.onlyMorePopular">true</str>
<str name="spellcheck.count">20</str>
</lst>
<arr name="last-components">
<str>spellcheck</str>
</arr>
</requestHandler>
<!-- the following handler will be used for eligible dismax searches defined
in web/conf/searchspecs.yaml. Searches relying on advanced features
incompatible with dismax will be sent to the standard handler instead.
You can use this handler definition to set global Dismax settings
(i.e. mm / bf). If you need different settings for different types of
searches (i.e. Title vs. Author), you can also configure individual
settings in the searchspecs.yaml file.
-->
<requestHandler name="dismax" class="solr.SearchHandler">
<lst name="defaults">
<str name="defType">dismax</str>
<str name="echoParams">explicit</str>
<str name="spellcheck.extendedResults">true</str>
<str name="spellcheck.onlyMorePopular">true</str>
<str name="spellcheck.count">20</str>
</lst>
<arr name="last-components">
<str>spellcheck</str>
</arr>
</requestHandler>
<requestHandler name="morelikethis" class="solr.MoreLikeThisHandler">
<lst name="defaults">
<str name="mlt.fl">title,title_short,callnumber-label,topic,language,author,publishDate</str>
<str name="mlt.qf">
title^75
title_short^100
callnumber-label^400
topic^300
language^30
author^75
publishDate
</str>
<int name="mlt.mintf">1</int>
<int name="mlt.mindf">1</int>
<str name="mlt.boost">true</str>
<int name="mlt.count">5</int>
<int name="rows">5</int>
</lst>
</requestHandler>
<searchComponent name="spellcheck" class="org.apache.solr.handler.component.SpellCheckComponent">
<lst name="spellchecker">
<str name="name">default</str>
<str name="field">spellingShingle</str>
<str name="accuracy">0.75</str>
<str name="spellcheckIndexDir">./spellShingle</str>
<str name="queryAnalyzerFieldType">textSpellShingle</str>
<str name="buildOnOptimize">true</str>
</lst>
<lst name="spellchecker">
<str name="name">basicSpell</str>
<str name="field">spelling</str>
<str name="accuracy">0.75</str>
<str name="spellcheckIndexDir">./spellchecker</str>
<str name="queryAnalyzerFieldType">textSpell</str>
<str name="buildOnOptimize">true</str>
</lst>
</searchComponent>
<queryConverter name="queryConverter" class="org.apache.solr.spelling.SpellingQueryConverter"/>
<!--
Search components are registered to SolrCore and used by Search Handlers
By default, the following components are avaliable:
<searchComponent name="query" class="org.apache.solr.handler.component.QueryComponent" />
<searchComponent name="facet" class="org.apache.solr.handler.component.FacetComponent" />
<searchComponent name="mlt" class="org.apache.solr.handler.component.MoreLikeThisComponent" />
<searchComponent name="highlight" class="org.apache.solr.handler.component.HighlightComponent" />
<searchComponent name="stats" class="org.apache.solr.handler.component.StatsComponent" />
<searchComponent name="debug" class="org.apache.solr.handler.component.DebugComponent" />
If you register a searchComponent to one of the standard names, that will be used instead.
-->
<requestHandler name="/search" class="org.apache.solr.handler.component.SearchHandler">
<lst name="defaults">
<str name="echoParams">explicit</str>
</lst>
<!--
By default, this will register the following components:
<arr name="components">
<str>query</str>
<str>facet</str>
<str>mlt</str>
<str>highlight</str>
<str>debug</str>
</arr>
To insert handlers before or after the 'standard' components, use:
<arr name="first-components">
<str>first</str>
</arr>
<arr name="last-components">
<str>last</str>
</arr>
-->
<arr name="last-components">
<str>spellcheck</str>
<str>elevator</str>
</arr>
</requestHandler>
<searchComponent name="elevator" class="org.apache.solr.handler.component.QueryElevationComponent" >
<!-- pick a fieldType to analyze queries -->
<str name="queryFieldType">string</str>
<str name="config-file">elevate.xml</str>
</searchComponent>
<requestHandler name="/elevate" class="org.apache.solr.handler.component.SearchHandler" startup="lazy">
<lst name="defaults">
<str name="echoParams">explicit</str>
</lst>
<arr name="last-components">
<str>elevator</str>
</arr>
</requestHandler>
<!-- Update request handler.
Note: Since solr1.1 requestHandlers requires a valid content type header if posted in
the body. For example, curl now requires: -H 'Content-type:text/xml; charset=utf-8'
The response format differs from solr1.1 formatting and returns a standard error code.
To enable solr1.1 behavior, remove the /update handler or change its path
-->
<requestHandler name="/update" class="solr.XmlUpdateRequestHandler" />
<requestHandler name="/update" class="solr.XmlUpdateRequestHandler" >
<lst name="defaults">
<str name="update.processor">dedupe</str>
</lst>
</requestHandler>
<!-- An example dedup update processor that creates the "id" field on the fly
based on the hash code of some other fields. This example has overwriteDupes
set to false since we are using the id field as the signatureField and Solr
will maintain uniqueness based on that anyway. -->
<updateRequestProcessorChain name="dedupe">
<processor class="org.apache.solr.update.processor.SignatureUpdateProcessorFactory">
<bool name="enabled">true</bool>
<bool name="overwriteDupes">true</bool>
<str name="signatureField">dedupeHash</str>
<str name="fields">title</str>
<str name="signatureClass">org.apache.solr.update.processor.Lookup3Signature</str>
</processor>
<processor class="solr.LogUpdateProcessorFactory" />
<processor class="solr.RunUpdateProcessorFactory" />
</updateRequestProcessorChain>
<!--
Analysis request handler. Since Solr 1.3. Use to returnhow a document is analyzed. Useful
for debugging and as a token server for other types of applications
-->
<requestHandler name="/analysis" class="solr.AnalysisRequestHandler" />
<!-- CSV update handler, loaded on demand -->
<requestHandler name="/update/csv" class="solr.CSVRequestHandler" startup="lazy" />
<!--
Admin Handlers - This will register all the standard admin RequestHandlers. Adding
this single handler is equivolent to registering:
<requestHandler name="/admin/luke" class="org.apache.solr.handler.admin.LukeRequestHandler" />
<requestHandler name="/admin/system" class="org.apache.solr.handler.admin.SystemInfoHandler" />
<requestHandler name="/admin/plugins" class="org.apache.solr.handler.admin.PluginInfoHandler" />
<requestHandler name="/admin/threads" class="org.apache.solr.handler.admin.ThreadDumpHandler" />
<requestHandler name="/admin/properties" class="org.apache.solr.handler.admin.PropertiesRequestHandler" />
<requestHandler name="/admin/file" class="org.apache.solr.handler.admin.ShowFileRequestHandler" >
If you wish to hide files under ${solr.home}/conf, explicitly register the ShowFileRequestHandler using:
<requestHandler name="/admin/file" class="org.apache.solr.handler.admin.ShowFileRequestHandler" >
<lst name="invariants">
<str name="hidden">synonyms.txt</str>
<str name="hidden">anotherfile.txt</str>
</lst>
</requestHandler>
-->
<requestHandler name="/admin/" class="org.apache.solr.handler.admin.AdminHandlers" />
<!-- ping/healthcheck -->
<requestHandler name="/admin/ping" class="PingRequestHandler">
<lst name="defaults">
<str name="qt">standard</str>
<str name="q">solrpingquery</str>
<str name="echoParams">all</str>
</lst>
</requestHandler>
<!-- Echo the request contents back to the client -->
<requestHandler name="/debug/dump" class="solr.DumpRequestHandler" >
<lst name="defaults">
<str name="echoParams">explicit</str> <!-- for all params (including the default etc) use: 'all' -->
<str name="echoHandler">true</str>
</lst>
</requestHandler>
<highlighting>
<!-- Configure the standard fragmenter -->
<!-- This could most likely be commented out in the "default" case -->
<fragmenter name="gap" class="org.apache.solr.highlight.GapFragmenter" default="true">
<lst name="defaults">
<int name="hl.fragsize">100</int>
</lst>
</fragmenter>
<!-- A regular-expression-based fragmenter (f.i., for sentence extraction) -->
<fragmenter name="regex" class="org.apache.solr.highlight.RegexFragmenter">
<lst name="defaults">
<!-- slightly smaller fragsizes work better because of slop -->
<int name="hl.fragsize">70</int>
<!-- allow 50% slop on fragment sizes -->
<float name="hl.regex.slop">0.5</float>
<!-- a basic sentence pattern -->
<str name="hl.regex.pattern">[-\w ,/\n\"']{20,200}</str>
</lst>
</fragmenter>
<!-- Configure the standard formatter -->
<formatter name="html" class="org.apache.solr.highlight.HtmlFormatter" default="true">
<lst name="defaults">
<str name="hl.simple.pre"><![CDATA[<em>]]></str>
<str name="hl.simple.post"><![CDATA[</em>]]></str>
</lst>
</formatter>
</highlighting>
<!-- queryResponseWriter plugins... query responses will be written using the
writer specified by the 'wt' request parameter matching the name of a registered
writer.
The "default" writer is the default and will be used if 'wt' is not specified
in the request. XMLResponseWriter will be used if nothing is specified here.
The json, python, and ruby writers are also available by default.
<queryResponseWriter name="xml" class="org.apache.solr.request.XMLResponseWriter" default="true"/>
<queryResponseWriter name="json" class="org.apache.solr.request.JSONResponseWriter"/>
<queryResponseWriter name="python" class="org.apache.solr.request.PythonResponseWriter"/>
<queryResponseWriter name="ruby" class="org.apache.solr.request.RubyResponseWriter"/>
<queryResponseWriter name="php" class="org.apache.solr.request.PHPResponseWriter"/>
<queryResponseWriter name="phps" class="org.apache.solr.request.PHPSerializedResponseWriter"/>
<queryResponseWriter name="custom" class="com.example.MyResponseWriter"/>
-->
<!-- XSLT response writer transforms the XML output by any xslt file found
in Solr's conf/xslt directory. Changes to xslt files are checked for
every xsltCacheLifetimeSeconds.
-->
<queryResponseWriter name="xslt" class="org.apache.solr.request.XSLTResponseWriter">
<int name="xsltCacheLifetimeSeconds">5</int>
</queryResponseWriter>
<!-- config for the admin interface -->
<admin>
<defaultQuery>shakespeare</defaultQuery>
<!-- configure a healthcheck file for servers behind a loadbalancer
<healthcheck type="file">server-enabled</healthcheck>
-->
</admin>
</config>
