題記

Elaticsearch的原理明白了以後，手頭有很多不同型別的資料，如:
1）單條資料，如程式中自己構造的JSON格式資料；
2）符合Elasticsearch索引規範的批量資料；
3）日誌檔案，格式*.log;
4）結構化資料，儲存在mysql、oracle等關係型資料庫中；
5）非結構化資料，儲存在mongo中；
如何將這些資料匯入到Elasticsearch中呢？接下來，本文將逐個介紹。

1、單條索引匯入elasticsearch

該方法類似mysql的insert 語句，用於插入一條資料。

[root@yang json_input]# curl -XPUT 'http://192.168.1.1:9200/blog/article/1' -d '
 

> {
> "title":"New version of Elasticsearch released!",
> "content":"Version 1.0 released today!",
> "tags":["announce","elasticsearch","release"]
> }'

結果檢視如下所示：

[root@yang json_input]# curl -XGET 'http://192.168.1.1:9200/blog/article/1?pretty'
{
  "_index" : "blog",
  "_type" : "article"
 
,
  "_id" : "1",
  "_version" : 1,
  "found" : true,
  "_source" : {
  "title" : "New version of Elasticsearch released!",
  "content" : "Version 1.0 released today!",
  "tags" : [ "announce", "elasticsearch", "release" ]
  }
}

圖形化顯示如下：

2、批量索引匯入到 elasticsearch。

（1）索引結構對映

類似於SQL建立模式描述資料，Mapping控制並定義結構。

[root@yang json_input]# cat mapping.json
{
"book" : {
"_all": {
"enabled": false
},
"properties" : {
"author" : {
"type" : "string"
},
"characters" : {
"type" : "string"
},
"copies" : {
"type" : "long",
"ignore_malformed" : false
},
"otitle" : {
"type" : "string"
},
"tags" : {
"type" : "string"
},
"title" : {
"type" : "string"
},
"year" : {
"type" : "long",
"ignore_malformed" : false,
"index" : "analyzed"
},
"available" : {
"type" : "boolean"
}
}
}
}
[root@yang json_input]# curl -XPUT 'http://110.0.11.120:9200/library/book/_mapping' -d @mapping.json
{"acknowledged":true}

（2）批量索引，將構造好的JSON資訊和資料匯入elasticsearch

Elasticsearch可以合併多個請求至單個包中，而這些包可以單個請求的形式傳送。如此，可以將多個操作結合起來：

1）在索引中增加或更換現有文件（index）；
2）從索引中移除文件（delete）；
3）當索引中不存在其他文件定義時，在索引中增加新文件（create)。

為了獲得較高的處理效率，選擇這樣的請求格式。它假定，請求的每一行包含描述操作說明的JSON物件，第二行為JSON物件本身。

可以把第一行看做資訊行，第二行行為資料行。唯一的例外是Delete操作，它只包含資訊行。

舉例如下：

[root@yang json_input]# cat documents_03.json
{ "index": {"_index": "library", "_type": "book", "_id": "1"}}
{ "title": "All Quiet on the Western Front","otitle": "Im Westen nichts Neues","author": "Erich Maria Remarque","year": 1929,"characters": ["Paul Bäumer", "Albert Kropp", "Haie Westhus", "Fredrich Müller", "Stanislaus Katczinsky", "Tjaden"],"tags": ["novel"],"copies": 1, "available": true, "section" : 3}
{ "index": {"_index": "library", "_type": "book", "_id": "2"}}
{ "title": "Catch-22","author": "Joseph Heller","year": 1961,"characters": ["John Yossarian", "Captain Aardvark", "Chaplain Tappman", "Colonel Cathcart", "Doctor Daneeka"],"tags": ["novel"],"copies": 6, "available" : false, "section" : 1}
{ "index": {"_index": "library", "_type": "book", "_id": "3"}}
{ "title": "The Complete Sherlock Holmes","author": "Arthur Conan Doyle","year": 1936,"characters": ["Sherlock Holmes","Dr. Watson", "G. Lestrade"],"tags": [],"copies": 0, "available" : false, "section" : 12}
{ "index": {"_index": "library", "_type": "book", "_id": "4"}}
{ "title": "Crime and Punishment","otitle": "Преступлéние и наказáние","author": "Fyodor Dostoevsky","year": 1886,"characters": ["Raskolnikov", "Sofia Semyonovna Marmeladova"],"tags": [],"copies": 0, "available" : true}

為了執行批量請求，Elasticsearch提供了_bulk端點，形式是/_bulk，或者是/index_name/_bulk, 甚至是/index_name/type_name/_bulk。

Elasticsearch會返回每個操作的具體的資訊，因此對於大批量的請求，響應也是巨大的。

3）執行結果如下所示：

[root@yang json_input]# curl -s -XPOST '10.0.1.30:9200/_bulk' --data-binary @documents_03.json
{"took":150,"errors":false,"items":[{"index":{"_index":"library","_type":"book","_id":"1","_version":1,"_shards":{"total":2,"successful":1,"failed":0},"status":201}},{"index":{"_index":"library","_type":"book","_id":"2","_version":1,"_shards":{"total":2,"successful":1,"failed":0},"status":201}},{"index":{"_index":"library","_type":"book","_id":"3","_version":1,"_shards":{"total":2,"successful":1,"failed":0},"status":201}},{"index":{"_index":"library","_type":"book","_id":"4","_version":1,"_shards":{"total":2,"successful":1,"failed":0},"status":201}}]}

執行結果如下圖所示：

3、使用Logstash將 log檔案匯入elasticsearch

以下以專案實戰的 MprobeDebug.log匯入到ES中。

[[email protected] logstash_conf]# tail -f MrobeDebug.log
[DEBUG][2015-07-23 23:59:58,138] : After CurProbe.Update()....lineNo:233, function:main
[DEBUG][2015-07-23 23:59:58,594] : lineNo:960, function:MNetworker::MessageTranslator, revoke nMsgRes = m_MsgPool.PeekMessage(CurMsg);
[DEBUG][2015-07-23 23:59:58,608] : ProbeTaskType_FTP lineNo:148, function:TempProbe::Update
........

核心配置檔案要求如下：

[[email protected] logstash_conf]# cat three.conf
input {
file {
path=> "/opt/logstash/bin/logstash_conf/MrobeDebug.log"
type=>"ttlog"
}
}

output {
elasticsearch {
hosts => "110.10.11.120:9200"
index => "tt_index"
}
stdout { codec => json_lines }
}

匯入結果如下：
合計匯入資料：200414條。

4、從Mysql/Oracle關係型資料庫向Elasticsearch匯入資料

5、從MongoDB非關係型資料庫向Elasticsearch匯入資料

使用外掛：mongo-connector
1）mongo與副本整合員連線
2）初始化副本集配置
3）Mongo與ES同步操作

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