Redisearch 安装

RediSearch是Redis的一个模块，提供查询、二次索引和全文搜索功能。 要使用RediSearch，首先要在Redis数据上声明索引。 然后可以使用research查询语言查询该数据。

RediSearch使用压缩的倒置索引，以较低的内存占用率进行快速索引。

重点：redis版本要安装6.0以上，这里安装的是 6.0.16 版本。

源码编译

Attaching some useful links:

https://github.com/RediSearch/RediSearch

https://redis.io/docs/stack/search/quick_start/#download-and-running-binaries

# 下载源码
git clone --recursive https://github.com/RediSearch/RediSearch.git
cd RediSearch

## On Linux:

make setup

#Next, build:

make build

# 编译完成后，生成so文件如下
root@ubuntu-x64_02:/opt/RediSearch# find . -name "*.so"
./bin/linux-x64-release/search/redisearch.so
./bin/linux-x64-release/search/example_extension/libexample_extension.so

启动服务

Next, run Redis with RediSearch:

# 将redisearch.so复制到bin目录，如下：
root@ubuntu-x64_02:/opt/RediSearch# ls -lth /usr/local/redis/bin/
total 58M
-rwxr-xr-x 1 root  root  5.2M Jul  2 04:48 redisearch.so
-rwxr-x--- 1 redis redis 3.6K Jul  2 04:43 redis-trib.rb
-rwxr-x--- 1 redis redis  11M Jul  2 04:43 redis-server
-rwxr-x--- 1 redis redis  11M Jul  2 04:43 redis-sentinel
-rwxr-x--- 1 redis redis 6.0M Jul  2 04:43 redis-cli
-rwxr-x--- 1 redis redis  11M Jul  2 04:43 redis-check-rdb
-rwxr-x--- 1 redis redis  11M Jul  2 04:43 redis-check-aof
-rwxr-x--- 1 redis redis 5.6M Jul  2 04:43 redis-benchmark
-rwxr-x--- 1 redis redis  735 Jul  2 04:43 mkreleasehdr.sh 

# 启动redis集群，所以节点都带参数--loadmodule
su - redis -c "/usr/local/redis/bin/redis-server /etc/redis7001.conf --loadmodule /usr/local/redis/bin/redisearch.so 2>&1 >/dev/null & "
su - redis -c "/usr/local/redis/bin/redis-server /etc/redis7002.conf --loadmodule /usr/local/redis/bin/redisearch.so 2>&1 >/dev/null & "
su - redis -c "/usr/local/redis/bin/redis-server /etc/redis7003.conf --loadmodule /usr/local/redis/bin/redisearch.so 2>&1 >/dev/null & "
su - redis -c "/usr/local/redis/bin/redis-server /etc/redis7004.conf --loadmodule /usr/local/redis/bin/redisearch.so 2>&1 >/dev/null & "
su - redis -c "/usr/local/redis/bin/redis-server /etc/redis7005.conf --loadmodule /usr/local/redis/bin/redisearch.so 2>&1 >/dev/null & "
su - redis -c "/usr/local/redis/bin/redis-server /etc/redis7006.conf --loadmodule /usr/local/redis/bin/redisearch.so 2>&1 >/dev/null & "


# 所有节点启动完毕
root@ubuntu-x64_02:/opt/RediSearch# ps -ef |grep redis 
redis     1949     1  0 22:19 ?        00:00:00 /usr/local/redis/bin/redis-server 192.168.88.12:7001 [cluster]
redis     1960     1  0 22:20 ?        00:00:00 /usr/local/redis/bin/redis-server 192.168.88.12:7002 [cluster]
redis     1971     1  0 22:20 ?        00:00:00 /usr/local/redis/bin/redis-server 192.168.88.12:7003 [cluster]
redis     1982     1  0 22:20 ?        00:00:00 /usr/local/redis/bin/redis-server 192.168.88.12:7004 [cluster]
redis     1986     1  0 22:20 ?        00:00:00 /usr/local/redis/bin/redis-server 192.168.88.12:7005 [cluster]
redis     1995     1  0 22:20 ?        00:00:00 /usr/local/redis/bin/redis-server 192.168.88.12:7006 [cluster]
root      2017  1778  0 22:20 pts/0    00:00:00 grep --color=auto redis

# 集群 正常
192.168.88.12:7001> cluster info
cluster_state:ok
cluster_slots_assigned:16384
cluster_slots_ok:16384
cluster_slots_pfail:0
cluster_slots_fail:0
cluster_known_nodes:6
cluster_size:3
cluster_current_epoch:9
cluster_my_epoch:7
cluster_stats_messages_ping_sent:220
cluster_stats_messages_pong_sent:211
cluster_stats_messages_sent:431
cluster_stats_messages_ping_received:211
cluster_stats_messages_pong_received:217
cluster_stats_messages_received:428


# 节点状态
192.168.88.12:7001> cluster nodes
17018ec96fc120ab7f825667bbe06659c66b58e5 192.168.88.12:7003@17003 slave d280ca1005ebe99a6ec0151c6d94a6df4ac5d760 0 1657118079000 9 connected
0f8cd36ed85993fb1be158880da6569af26e4d11 192.168.88.12:7005@17005 master - 0 1657118079542 8 connected 5461-10922
695367779b622b28d336dbd18f1b7e97cbb150ed 192.168.88.12:7004@17004 master - 0 1657118079843 7 connected 0-5460
d280ca1005ebe99a6ec0151c6d94a6df4ac5d760 192.168.88.12:7006@17006 master - 0 1657118079000 9 connected 10923-16383
3a6618836169c30c709085fdde22d0a518e190c6 192.168.88.12:7001@17001 myself,slave 695367779b622b28d336dbd18f1b7e97cbb150ed 0 1657118078000 7 connected
6aa10de17bd3fca80515385728d688d6b3837616 192.168.88.12:7002@17002 slave 0f8cd36ed85993fb1be158880da6569af26e4d11 0 1657118079000 8 connected

创建索引

Creating an index with fields and weights (default weight is 1.0)

# Creating an index
192.168.88.12:7006> FT.CREATE myIdx ON HASH PREFIX 1 doc: SCHEMA title TEXT WEIGHT 5.0 body TEXT url TEXT
OK
192.168.88.12:7006> 


# Adding documents to the index
192.168.88.12:7006>  hset doc:1 title "hello world" body "lorem ipsum" url "http://redis.io"
-> Redirected to slot [5105] located at 192.168.88.12:7004
(integer) 0
192.168.88.12:7004> 

# 搜索索引
192.168.88.12:7004> FT.SEARCH myIdx "hello world" LIMIT 0 10
-> Redirected to slot [13033] located at 192.168.88.12:7006
1) (integer) 0
192.168.88.12:7006>

在集群模式下可以成功加载readsearch.so模块，但搜索不会自动分发，导致创建好了索引，搜索不到文档，这个需要企业版支持，文档说了reresearch有一个分布式集群版本，可以扩展到数百台服务器上的数十亿个文档。 目前，分布式reresearch已经成为Redis企业云和Redis企业软件的一部分。

社区版支持

如果是社区版的 Redis 集群怎么支持readsearch呢？ 看文档发现可以在编译指定OSS版本。 参考如下文档 ：

安装详细文档参考如下：
https://redis.io/docs/stack/search/development/

make build # compile and link
COORD=1|oss|rlec # build coordinator (1|oss: Open Source, rlec: Enterprise)

在编译时指定为 OSS 版本
make build COORD=oss will build OSS RediSearch Coordinator

RSCoodinator版本参考下面文档
https://github.com/RediSearch/RSCoordinator

## 安装 OSS 2.2.9 版本，和最新的企业版本保持一致！！！！
git clone -b v2.2.9 --recursive https://github.com/RediSearch/RediSearch.git

make setup

make build COORD=oss

# 编译完成后把 module-oss.so 复制到 bin 目录下面
redisearch.so # 是主从的
module-oss.so # 是集群的

# 配置文件加上,所有节点都加上
loadmodule /usr/local/redis/bin/module-oss.so OSS_GLOBAL_PASSWORD <redis密码>

# 查看版本
192.168.88.12:7004> info Modules 
# Modules
module:name=search,ver=20209,api=1,filters=0,usedby=[],using=[],options=[]

RSCoordinator是一个附加模块，支持通过reresearch进行可伸缩的分布式搜索。

使用OSS版本可以在社区版集群模式下分发搜索。