2、商品的CRUD操作(document CRUD操作)
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1、簡單的集羣管理
(1)快速檢查集羣的健康狀況
es提供了一套api,叫做cat api,可以查看es中各種各樣的數據
GET /_cat/health?v
epoch timestamp cluster status node.total node.data shards pri relo init unassign pending_tasks max_task_wait_time active_shards_percent
1488006741 15:12:21 elasticsearch yellow 1 1 1 1 0 0 1 0 - 50.0%
epoch timestamp cluster status node.total node.data shards pri relo init unassign pending_tasks max_task_wait_time active_shards_percent
1488007113 15:18:33 elasticsearch green 2 2 2 1 0 0 0 0 - 100.0%
epoch timestamp cluster status node.total node.data shards pri relo init unassign pending_tasks max_task_wait_time active_shards_percent
1488007216 15:20:16 elasticsearch yellow 1 1 1 1 0 0 1 0 - 50.0%
如何快速瞭解集羣的健康狀況?green、yellow、red?
green:每個索引的primary shard和replica shard都是active狀態的
yellow:每個索引的primary shard都是active狀態的,但是部分replica shard不是active狀態,處於不可用的狀態
red:不是所有索引的primary shard都是active狀態的,部分索引有數據丟失了
爲什麼現在會處於一個yellow狀態?
我們現在就一個筆記本電腦,就啓動了一個es進程,相當於就只有一個node。現在es中有一個index,就是kibana自己內置建立的index。由於默認的配置是給每個index分配5個primary shard和5個replica shard,而且primary shard和replica shard不能在同一臺機器上(爲了容錯)。現在kibana自己建立的index是1個primary shard和1個replica shard。當前就一個node,所以只有1個primary shard被分配了和啓動了,但是一個replica shard沒有第二臺機器去啓動。
做一個小實驗:此時只要啓動第二個es進程,就會在es集羣中有2個node,然後那1個replica shard就會自動分配過去,然後cluster status就會變成green狀態。
(2)快速查看集羣中有哪些索引
GET /_cat/indices?v
health status index uuid pri rep docs.count docs.deleted store.size pri.store.size
yellow open .kibana rUm9n9wMRQCCrRDEhqneBg 1 1 1 0 3.1kb 3.1kb
(3)簡單的索引操作
創建索引:PUT /test_index?pretty
health status index uuid pri rep docs.count docs.deleted store.size pri.store.size
yellow open test_index XmS9DTAtSkSZSwWhhGEKkQ 5 1 0 0 650b 650b
yellow open .kibana rUm9n9wMRQCCrRDEhqneBg 1 1 1 0 3.1kb 3.1kb
刪除索引:DELETE /test_index?pretty
health status index uuid pri rep docs.count docs.deleted store.size pri.store.size
yellow open .kibana rUm9n9wMRQCCrRDEhqneBg 1 1 1 0 3.1kb 3.1kb
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2、商品的CRUD操作
(1)新增商品:新增文檔,建立索引
PUT /index/type/id
{
"json數據"
}
PUT /ecommerce/product/1
{
"name" : "gaolujie yagao",
"desc" : "gaoxiao meibai",
"price" : 30,
"producer" : "gaolujie producer",
"tags": [ "meibai", "fangzhu" ]
}
{
"_index": "ecommerce",
"_type": "product",
"_id": "1",
"_version": 1,
"result": "created",
"_shards": {
"total": 2,
"successful": 1,
"failed": 0
},
"created": true
}
PUT /ecommerce/product/2
{
"name" : "jiajieshi yagao",
"desc" : "youxiao fangzhu",
"price" : 25,
"producer" : "jiajieshi producer",
"tags": [ "fangzhu" ]
}
PUT /ecommerce/product/3
{
"name" : "zhonghua yagao",
"desc" : "caoben zhiwu",
"price" : 40,
"producer" : "zhonghua producer",
"tags": [ "qingxin" ]
}
es會自動建立index和type,不需要提前創建,而且es默認會對document每個field都建立倒排索引,讓其可以被搜索
(2)查詢商品:檢索文檔
GET /index/type/id
GET /ecommerce/product/1
{
"_index": "ecommerce",
"_type": "product",
"_id": "1",
"_version": 1,
"found": true,
"_source": {
"name": "gaolujie yagao",
"desc": "gaoxiao meibai",
"price": 30,
"producer": "gaolujie producer",
"tags": [
"meibai",
"fangzhu"
]
}
}
(3)修改商品:替換文檔
PUT /ecommerce/product/1
{
"name" : "jiaqiangban gaolujie yagao",
"desc" : "gaoxiao meibai",
"price" : 30,
"producer" : "gaolujie producer",
"tags": [ "meibai", "fangzhu" ]
}
{
"_index": "ecommerce",
"_type": "product",
"_id": "1",
"_version": 1,
"result": "created",
"_shards": {
"total": 2,
"successful": 1,
"failed": 0
},
"created": true
}
{
"_index": "ecommerce",
"_type": "product",
"_id": "1",
"_version": 2,
"result": "updated",
"_shards": {
"total": 2,
"successful": 1,
"failed": 0
},
"created": false
}
PUT /ecommerce/product/1
{
"name" : "jiaqiangban gaolujie yagao"
}
替換方式有一個不好,即使必須帶上所有的field,才能去進行信息的修改
(4)修改商品:更新文檔
POST /ecommerce/product/1/_update
{
"doc": {
"name": "jiaqiangban gaolujie yagao"
}
}
{
"_index": "ecommerce",
"_type": "product",
"_id": "1",
"_version": 8,
"result": "updated",
"_shards": {
"total": 2,
"successful": 1,
"failed": 0
}
}
我的風格,其實有選擇的情況下,不太喜歡念ppt,或者照着文檔做,或者直接粘貼寫好的代碼,儘量是純手敲代碼
(5)刪除商品:刪除文檔
DELETE /ecommerce/product/1
{
"found": true,
"_index": "ecommerce",
"_type": "product",
"_id": "1",
"_version": 9,
"result": "deleted",
"_shards": {
"total": 2,
"successful": 1,
"failed": 0
}
}
{
"_index": "ecommerce",
"_type": "product",
"_id": "1",
"found": false
}