Elasticsearch与MongoDB 数据同步及分布式集群搭建（一）

Elasticsearch通过River可以与多种数据源Wikipedia, MongoDB, CouchDB, RabbitMQ, RSS, Sofa, JDBC, FileSystem,Dropbox等同步，公司的业务是用 MongoDB，今天测试环境虚拟机上配置了一下Elasticsearch 与 MongoDB的同步，作个大概的过程记录，主要利用richardwilly98 / elasticsearch-river-mongodb。

River通过读取mongodb的oplog来同步数据，oplog这个表来使集群中的不同机器数据同步的，可以保证es里面的数据和mongodb里面的是一样的，所以Mongdb必须是个集群才能拥有oplog.注意：该插件只支持集群环境下的mongodb，因为集群环境下的mongodb才有oplog这个

Elasticsearch 和 MongoDB需要安装对应的版本才能实现同步，我这里用了最新的Elasticsearch 1.4.2 和 MongoDB 3.0.0,相应的版本要求参考下表

elasticsearch-mongodb

 

MongDB是一个副本集的集群，具体副本集集群的搭建不详细写了，Elasticsearch的安装配置也省略。

1.安装elasticsearch-river-mongodb

# ./elasticsearch-1.4.4/bin/plugin -install elasticsearch/elasticsearch-mapper-attachments/2.4.1# ./elasticsearch-1.4.4/bin/plugin -i com.github.richardwilly98.elasticsearch/elasticsearch-river-mongodb/2.0.5

2.建立river

curl -XPUT "http://10.253.1.70:9200/_river/threads_mongo_river/_meta"</span> -d'{  "type": "mongodb",  "mongodb": {     "servers":    [      { "host": "10.253.1.71", "port": 27017}    ],    "db": "threads",     "collection": "threads",     "gridfs": false  },   "index": {     "name": "test",     "type": "threads"  }}'

这里只是简单的配置了建立连接的MongoDB以及相应的db,collection对于的elasticsearch index和type，还有详细的配置没有使用到，比如options等，具体根据业务可以配置，下面是一份详细的配置样例:

$ curl -XPUT "localhost:9200/_river/${es.river.name}/_meta" -d '{  "type": "mongodb",  "mongodb": {     "servers":    [      { "host": ${mongo.instance1.host}, "port": ${mongo.instance1.port} },      { "host": ${mongo.instance2.host}, "port": ${mongo.instance2.port} }    ],    "options": {       "secondary_read_preference" : true,       "drop_collection": ${mongo.drop.collection},       "exclude_fields": ${mongo.exclude.fields},      "include_fields": ${mongo.include.fields},      "include_collection": ${mongo.include.collection},      "import_all_collections": ${mongo.import.all.collections},      "initial_timestamp": {        "script_type": ${mongo.initial.timestamp.script.type},        "script": ${mongo.initial.timestamp.script}      },      "skip_initial_import" : ${mongo.skip.initial.import},      "store_statistics" : ${mongo.store.statistics},    },    "credentials":    [      { "db": "local", "user": ${mongo.local.user}, "password": ${mongo.local.password} },      { "db": "admin", "user": ${mongo.db.user}, "password": ${mongo.db.password} }    ],    "db": ${mongo.db.name},     "collection": ${mongo.collection.name},     "gridfs": ${mongo.is.gridfs.collection},    "filter": ${mongo.filter}  },   "index": {     "name": ${es.index.name},     "throttle_size": ${es.throttle.size},    "bulk_size": ${es.bulk.size},    "type": ${es.type.name}    "bulk": {      "actions": ${es.bulk.actions},      "size": ${es.bulk.size},      "concurrent_requests": ${es.bulk.concurrent.requests},      "flush_interval": ${es.bulk.flush.interval}    }  }}'

一些配置项的解释如下,具体可以查看github的wiki:

• db为同步的数据库名，
• host mongodb的ip地址（默认为localhost）
• port mongodb的端口
• collection 要同步的表名
• fields 要同步的字段名（用逗号隔开，默认全部）
• gridfs 是否是gridfs文件（如果collection是gridfs的话就设置成true）
• local_db_user local数据库的用户名（没有的话不用写）
• local_db_password local数据库的密码（没有的话不用写）
• db_user 要同步的数据库的密码（没有的话不用写）
• db_password 要同步的数据库的密码（没有的话不用写）
• name 索引名（不能之前存在）
• type 类型
• bulk_size 批量添加的最大数
• bulk_timeout 批量添加的超时时间

3.测试是否成功
我测试的库中数据较少，所以就直接都查出来看看是否能查出来吧

$ curl -XGET "http://10.253.1.70:9200/test/threads/_search" -d '{    "took": 20,    "timed_out": false,    "_shards": {        "total": 5,        "successful": 5,        "failed": 0    },    "hits": {        "total": 4,        "max_score": 1,        "hits": [            {                "_index": "test",                "_type": "threads",                "_id": "54fa32b22c44cf67cb6a9d1b",                "_score": 1,                "_source": {                    "_id": "54fa32b22c44cf67cb6a9d1b",                    "title": "where is my car",                    "content": "ask yourself"                }            },            {                "_index": "test",                "_type": "threads",                "_id": "54fa2f5c2c44cf67cb6a9d19",                "_score": 1,                "_source": {                    "_id": "54fa2f5c2c44cf67cb6a9d19",                    "title": "this is title",                    "content": "what is the fuck"                }            },            {                "_index": "test",                "_type": "threads",                "_id": "54fa2f892c44cf67cb6a9d1a",                "_score": 1,                "_source": {                    "_id": "54fa2f892c44cf67cb6a9d1a",                    "title": "are you ok",                    "content": "yes,i am ok"                }            },            {                "_index": "test",                "_type": "threads",                "_id": "54fa49ccc104e2264e02deea",                "_score": 1,                "_source": {                    "_id": "54fa49ccc104e2264e02deea",                    "title": "hello word",                    "content": "hello hello haha"                }            }        ]    }}

看来数据已经同步过来了，然后在MongoDB 添加一条记录，执行同样的操作查找对于的记录或者 total已经+1那么同步完成了。