1、bulk相當(dāng)于數(shù)據(jù)庫里的bash操作。

2、引入批量操作bulk，提高工作效率，你想啊，一批一批添加與一條一條添加，誰快?

3、bulk API可以幫助我們同時執(zhí)行多個請求

4、bulk的格式：

action：index/create/update/delete

metadata：_index,_type,_id

request body：_source(刪除操作不需要加request body)

{ action: { metadata }}

{ request body }

5、bulk里為什么不支持get呢？

　　答：批量操作，里面放get操作，沒啥用！所以，官方也不支持。

6、create 和index的區(qū)別

　　如果數(shù)據(jù)存在，使用create操作失敗，會提示文檔已經(jīng)存在，使用index則可以成功執(zhí)行。

7、bulk一次最大處理多少數(shù)據(jù)量？

　　bulk會把將要處理的數(shù)據(jù)載入內(nèi)存中，所以數(shù)據(jù)量是有限制的，最佳的數(shù)據(jù)量不是一個確定的數(shù)值，它取決于你的硬件，你的文檔大小以及復(fù)雜性，你的索引以及搜索的負(fù)載。

　　一般建議是1000-5000個文檔，如果你的文檔很大，可以適當(dāng)減少隊(duì)列，大小建議是5-15MB，默認(rèn)不能超過100M，可以在es的配置文件（即$ES_HOME下的config下的elasticsearch.yml）中。

elasticsearch-.yml（中文配置詳解）

　　來修改這個值http.max_content_length: 100mb【不建議修改，太大的話bulk也會慢】，

https://www.elastic.co/guide/en/elasticsearch/reference/2.4/modules-http.html

批量操作bulk例子

　（1）　比如，我這里，在$ES_HOME里，新建一文件，命名為request。（這里為什么命名為request，去看官網(wǎng)就是）在Linux里，有無后綴沒區(qū)別。

[hadoop@djt002 elasticsearch-2.4.3]$ pwd
/usr/local/elasticsearch/elasticsearch-2.4.3
[hadoop@djt002 elasticsearch-2.4.3]$ ll
total 56
drwxrwxr-x. 2 hadoop hadoop 4096 Feb 20 22:54 bin
drwxrwxr-x. 3 hadoop hadoop 4096 Feb 21 01:28 config
drwxrwxr-x. 3 hadoop hadoop 4096 Feb 20 22:59 data
drwxrwxr-x. 2 hadoop hadoop 4096 Feb 20 22:54 lib
-rw-rw-r--. 1 hadoop hadoop 11358 Aug 24 00:46 LICENSE.txt
drwxrwxr-x. 2 hadoop hadoop 4096 Feb 21 00:33 logs
drwxrwxr-x. 5 hadoop hadoop 4096 Dec 8 00:41 modules
-rw-rw-r--. 1 hadoop hadoop 150 Aug 24 00:46 NOTICE.txt
drwxrwxr-x. 2 hadoop hadoop 4096 Feb 20 22:59 plugins
-rw-rw-r--. 1 hadoop hadoop 8700 Aug 24 00:46 README.textile
[hadoop@djt002 elasticsearch-2.4.3]$ vim request
[hadoop@djt002 elasticsearch-2.4.3]$ more request
{"index":{"_index":"zhouls","_type":"emp","_id":"10"}}
{ "name":"jack", "age" :18}
{"index":{"_index":"zhouls","_type":"emp","_id":"11"}}
{"name":"tom", "age":27}
{"update":{"_index":"zhouls","_type":"emp", "_id":"2"}}
{"doc":{"age" :22}}
{"delete":{"_index":"zhouls","_type":"emp","_id":"1"}}
[hadoop@djt002 elasticsearch-2.4.3]$

或者

{ "index" : {"_index":"zhouls","_type":"emp","_id":"21"}}

{ "name" : "test21"}

例子：

{ "index" : { "_index" : "zhouls", "_type" : "type1", "_id" : "1" } }

{ "field1" : "value1" }

{ "index" : { "_index" : "zhouls", "_type" : "type1", "_id" : "2" } }

{ "field1" : "value1" }

{ "delete" : { "_index" : "zhouls", "_type" : "type1", "_id" : "2" } } 　　　　(刪除操作不需要加request body)

{ "create" : { "_index" : "zhouls", "_type" : "type1", "_id" : "3" } }

{ "field1" : "value3" }

{ "update" : {"_index" : "zhouls", "_type" : "type1","_id" : "1" } }

{ "doc" : {"field2" : "value2"} }

（2）使用文件的方式

　　vi requests

寫入批量操作語句。比如，下面

{"index":{"_index":"zhouls","_type":"emp","_id":"10"}}
{ "name":"jack", "age" :18}
{"index":{"_index":"zhouls","_type":"emp","_id":"11"}}
{"name":"tom", "age":27}
{"update":{"_index":"zhouls","_type":"emp", "_id":"2"}}
{"doc":{"age" :22}}
{"delete":{"_index":"zhouls","_type":"emp","_id":"1"}}

　　在$ES_HOME目錄下，執(zhí)行下面命令

　　curl -PUT '192.168.80.200:9200/_bulk' --data-binary @request;

或

　 curl -XPOST '192.168.80.200:9200/_bulk' --data-binary @request;

[hadoop@djt002 elasticsearch-2.4.3]$ curl -PUT '192.168.80.200:9200/_bulk' --data-binary @request;
{"took":123,"errors":true,"items":[{"index":{"_index":"zhouls","_type":"emp","_id":"10","_version":1,"_shards":{"total":2,"successful":1,"failed":0},"status":201}},{"index":{"_index":"zhouls","_type":"emp","_id":"11","_version":1,"_shards":{"total":2,"successful":1,"failed":0},"status":201}},{"update":{"_index":"zhouls","_type":"emp","_id":"2","status":404,"error":{"type":"document_missing_exception","reason":"[emp][2]: document missing","index":"zhouls","shard":"-1"}}},{"delete":{"_index":"zhouls","_type":"emp","_id":"1","_version":1,"_shards":{"total":2,"successful":1,"failed":0},"status":404,"found":false}}]}[hadoop@djt002 elasticsearch-2.4.3]$

之后，再查看下。

[hadoop@djt002 elasticsearch-2.4.3]$ curl -XGET 'http://192.168.80.200:9200/zhouls/emp/1?pretty'
{
"_index" : "zhouls",
"_type" : "emp",
"_id" : "1",
"found" : false
}
[hadoop@djt002 elasticsearch-2.4.3]$ curl -XGET 'http://192.168.80.200:9200/zhouls/emp/2?pretty'
{
"_index" : "zhouls",
"_type" : "emp",
"_id" : "2",
"found" : false
}
[hadoop@djt002 elasticsearch-2.4.3]$ curl -XGET 'http://192.168.80.200:9200/zhouls/emp/11?pretty'
{
"_index" : "zhouls",
"_type" : "emp",
"_id" : "11",
"_version" : 4,
"found" : true,
"_source" : {
"name" : "tom",
"age" : 27
}
}

[hadoop@djt002 elasticsearch-2.4.3]$ curl -XGET 'http://192.168.80.200:9200/zhouls/emp/10?pretty'
{
"_index" : "zhouls",
"_type" : "emp",
"_id" : "10",
"_version" : 4,
"found" : true,
"_source" : {
"name" : "jack",
"age" : 18
}
}

　　（3）bulk請求可以在URL中聲明/_index 或者/_index/_type

　　這個，自行去測試！

官網(wǎng)

https://www.elastic.co/guide/en/elasticsearch/reference/current/docs-bulk.html

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