solr与lucene
Solr最显著的特点就是其分布式，不然的话跟Lucene也就没多大区别了，那么什么时候我们会用到分布式搜索呢？那就是当索引过多的时候，多到了在一台服务器上存放时会因此而影响到搜索速度，这个时候就可以考虑将索引划分成多个分片，搜索时在多个分片上进行搜索，最后将多个搜索结果进行合并。接下来，我们将在一台服务器上使用solr-3.6.0为例来体验一下Solr的分布式搜索特性。在一台服务器上，我们将创建两个端口不一样的Solr服务，以此来模拟其分布式搜索功能。
将apache-solr-3.6.0解压到/usr/local目录下，步骤为：
1、做一个拷贝
cd apache-solr-3.6.0
cp -r example example7574
2、改变example7574端口号为7574
perl -pi -e s/8983/7574/g example7574/etc/jetty.xmlexample7574/exampledocs/post.sh
3、启动端口为8983的jetty服务
cd example
java -server -jar start.jar
4、启动端口为7574的jetty服务
cd example7574
java -server -jar start.jar
5、为端口为8983的服务创建索引
cd example/exampledocs
./post.sh *.xml
6、为端口为7574的服务创建索引
cd http://www.iyunv.com/example7574/exampledocs
./post.sh *.xml
7、通过浏览器或curl命令来进行分布式搜索
curl ‘http://localhost:8983/solr/select?shards=localhost:8983/solr,localhost:7574/solr&indent=true&q=ipod+solr’
搜索结果如下（共4条结果）：
0
87
true
ipod solr
localhost:8983/solr,localhost:7574/solr
IW-02
iPod & iPod Mini USB 2.0 Cable
Belkin
electronics
connector
car power adapter for iPod, white
2.0
11.5
11.50,USD
1
false
37.7752,-122.4232
2006-02-14T23:55:59Z
F8V7067-APL-KIT
Belkin Mobile Power Cord for iPod w/ Dock
Belkin
electronics
connector
car power adapter, white
4.0
19.95
19.95,USD
1
false
45.17614,-93.87341
2005-08-01T16:30:25Z
SOLR1000
Solr, the Enterprise Search Server
Apache Software Foundation
software
search
Advanced Full-Text Search Capabilities using Lucene
Optimized for High Volume Web Traffic
Standards Based Open Interfaces – XML and HTTP
Comprehensive HTML Administration Interfaces
Scalability – Efficient Replication to other Solr Search Servers
Flexible and Adaptable with XML configuration and Schema
Good unicode support: h茅llo (hello with an accent over the e)
0.0
0,USD
10
true
2006-01-17T00:00:00Z
MA147LL/A
Apple 60 GB iPod with Video Playback Black
Apple Computer Inc.
electronics
music
iTunes, Podcasts, Audiobooks
Stores up to 15,000 songs, 25,000 photos, or 150 hours of video
2.5-inch, 320×240 color TFT LCD display with LED backlight
Up to 20 hours of battery life
Plays AAC, MP3, WAV, AIFF, Audible, Apple Lossless, H.264 video
Notes, Calendar, Phone book, Hold button, Date display, Photo wallet, Built-in games, JPEG photo playback, Upgradeable firmware, USB 2.0 compatibility, Playback speed control, Rechargeable capability, Battery level indication
earbud headphones, USB cable
5.5
399.0
399.00,USD
10
true
37.7752,-100.0232
2005-10-12T08:00:00Z
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