Solr Cookbook学习记录 - 第6,8,9章

第6章 改进solr的性能

1. Paging your results quickly，编辑solrconfig.xml：
<queryResultWindowSize>160</queryResultWindowSize>
<queryResultMaxDocsCached>160</queryResultMaxDocsCached>

2. 配置document缓存，编辑solrconfig.xml：
<documentCache class="solr.LRUCache"   size="2560"    initialSize="2560"/>

3. 配置query result缓存，编辑solrconfig.xml：
<queryResultCache    class="solr.LRUCache"   size="16000"    initialSize="16000"   autowarmCount="4000"/>

4. 配置filter缓存，编辑solrconfig.xml：
<filterCache    class="solr.FastLRUCache"   size="2000"    initialSize="2000"    autowarmCount="1000"/>

5. 。。。

第8章

1. 相似度查询
/select?q=cookbook second
&mm=2
&qf=name
&defType=edismax
&mlt=true
&mlt.fl=name&
&mlt.mintf=1
&mlt.mindf=1

2. 高亮显示
/select?q=name:book
&hl=true

3. 高亮显示指定的字段
/select?q=name:book
&hl=true
&hl.fl=name,description

4. 改变高亮显示词两边的html标签
/select?q=name:book
&hl=true
&hl.simple.pre=<b>
&hl.simple.post=</b>

5. 如何高亮显示长文本中的词
<field name="name" type="text" indexed="true" stored="true"  
	termVectors="true" 
	termPositions="true" 
	termOffsets="true" />

/select?q=name:book
&hl=true
&hl.useFastVectorHighlighter=true

6. 计算统计搜索结果
/select?q=name:book
&stats=true
&stats.field=price

7. 检查用户的拼写错误
/spell?q=name:(othar boak)

配置solrconfig.xml：
<searchComponent name="spellcheck" class="solr.SpellCheckComponent">
	<str name="queryAnalyzerFieldType">name</str>
	<lst name="spellchecker">
		<str name="name">direct</str>
		<str name="field">name</str>
		<str name="classname">solr.DirectSolrSpellChecker</str>
		<str name="buildOnCommit">true</str>
	</lst>
</searchComponent>

<requestHandler name="/spell" class="solr.SearchHandler" startup="lazy">
    <lst name="defaults">
        <str name="df">name</str>
        <str name="spellcheck.dictionary">direct</str>
        <str name="spellcheck">on</str>
        <str name="spellcheck.collate">true</str>
    </lst>
    <arr name="last-components"> 
        <str>spellcheck</str>
    </arr>
</requestHandler>

8. Using field value to group results
/select?q=*:*
&group=true
&group.field=category

9. More than a single document in a group
/select?q=*:*
&group=true
&group.field=category
&group.limit=10

10. Using queries to group results
/select?q=*:*
&group=true
&group.query=price: [20.0 TO 50.0]
&group.query=price:[1.0 TO 19.99]

11. Using function queries to group results
/select?q=*:*
&group=true
&group.func=geodist(geo,0.0,0.0)

第9章

1. How to deal with too many opened files
异常：java.io.FileNotFoundException: /use/share/solr/data/index/_1.fdx (Too many open files)

编辑/etc/security/limits.conf
solr soft nofile 32000
solr hard nofile 32000

Now let's add the following line to the .bash_profile file in the solr user home  directory: 
ulimit -n 32000

编辑solrconfig.xml
<mergeFactor>2</mergeFactor>

2. How to deal with out-of-memory problems
异常：SEVERE: java.lang.OutOfMemoryError: Java heap space
java –Xmx1024M –Xms512m –jar start.jar

Monitoring heap when an out-of-memory error occurs
java –jar –XX:+HeapDumpOnOutOfMemoryError –XX:HeapDumpPath=/var/log/dump/ start.jar

3. 诊断solr的问题
vmstat, dstat, and iostat
jconsole and jvisualvm

使用http://sematext.com/spm/index.html监测solr

还可以使用：
http://ganglia.sourceforge.net/
http://munin-monitoring.org/
http://www.zabbix.com/
http://www.cacti.net
http://newrelic.com/

4. 查询某分类下的产品数量（以牛奶开头的产品）
/select?q=*:*&rows=0
&facet=true
&facet.field=category
&facet.mincount=1
&facet.limit=5
&facet.prefix=牛奶

5. ???
/select?q=*:*&defType=edismax&fq={!term f=category}Books And Tutorials

6. 提交xml文档
curl 'http://localhost:8983/solr/update' --data-binary @data.xml -H 'Content-type:application/xml'

curl 'http://localhost:8983/solr/update?softCommit=true'

7. solrconfig.xml中配置autoCommit
<autoCommit>
    <maxTime>60000</maxTime>
    <openSearcher>false</openSearcher>
</autoCommit>

<autoSoftCommit>
    <maxTime>1000</maxTime>
</autoSoftCommit>

8. ???
/select?q=solr book
&defType=edismax
&mm=1
&qf=name^10000 description