這期內容當中小編將會給大家帶來有關heka從kalka中讀取數據的示例分析，文章內容豐富且以專業的角度為大家分析和敘述，閱讀完這篇文章希望大家可以有所收獲。

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heka從kalka中讀取數據。

配置：

[hekad]
maxprocs = 2

[KafkaInputExample]
type = "KafkaInput"
topic = "test"
addrs = ["localhost:9092"]

[RstEncoder]

[LogOutput]
message_matcher = "TRUE"
encoder = "RstEncoder"

上述配置只有從kalfka中讀取數據并顯示到console，寫到kalfka中數據，

結果

:Timestamp: 2016-07-21 09:39:46.342093657 +0000 UTC
:Type: heka.kafka
:Hostname: master
:Pid: 0
:Uuid: 501b0a0e-63a9-4eee-b9ca-ab572c17d273
:Logger: KafkaInputExample
:Payload: {"msg":"Start Request","event":"artemis.web.ensure-running1","userid":"12","extra":{"workspace-id":"cN907xLngi"},"time":"2015-05-06T    20:40:05.509926234Z","severity":1}
:EnvVersion: 
:Severity: 7
:Fields:
    | name:"Key" type:bytes value:
    | name:"Topic" type:string value:"test"
    | name:"Partition" type:integer value:0
    | name:"Offset" type:integer value:8

讀取出來的數據放到了payload中，而fileds中存放了讀取kalkfa中的一些信息。那么可以使用jsondecoder進行解析。

[hekad]
maxprocs = 2

[KafkaInputExample]
type = "KafkaInput"
topic = "test"
addrs = ["localhost:9092"]
decoder="JsonDecoder"

[JsonDecoder]
type = "SandboxDecoder"
filename = "lua_decoders/json.lua"

        [JsonDecoder.config]
        type = "artemis"
        payload_keep = true
        map_fields = true
        Severity = "severity"

[RstEncoder]

[LogOutput]
message_matcher = "TRUE"
encoder = "RstEncoder"

結果如下：

:Timestamp: 2016-07-21 09:42:34 +0000 UTC
:Type: artemis
:Hostname: master
:Pid: 0
:Uuid: 3965285c-70ac-4069-a1a3-a9bcf518d3e8
:Logger: KafkaInputExample
:Payload: {"msg":"Start Request","event":"artemis.web.ensure-running2","userid":"11","extra":{"workspace-id":"cN907xLngi"},"time":"2015-05-06T    20:40:05.509926234Z","severity":1}
:EnvVersion: 
:Severity: 1
:Fields:
    | name:"time" type:string value:"2015-05-06T    20:40:05.509926234Z"
    | name:"msg" type:string value:"Start Request"
    | name:"userid" type:string value:"11"
    | name:"event" type:string value:"artemis.web.ensure-running2"
    | name:"extra.workspace-id" type:string value:"cN907xLngi"

經過decoder解析之后，fileds發生了改變，但是我們可以看到Logger顯示的還是KafkaInputExample，說明數據不是decoder產生，而是Input產生，只不過使用了decoder進行了解析，重寫改寫了fields而已。

接下來，把數據錄入都es中吧。
[hekad]
maxprocs = 2

[KafkaInputExample]
type = "KafkaInput"
topic = "test"
addrs = ["localhost:9092"]
decoder="JsonDecoder"

[JsonDecoder]
type = "SandboxDecoder"
filename = "lua_decoders/json.lua"

        [JsonDecoder.config]
        type = "artemis"
        payload_keep = true
        map_fields = true
        Severity = "severity"

[ESJsonEncoder]
index = "%{Type}-%{%Y.%m.%d}"
es_index_from_timestamp = true
type_name = "%{Type}"
    [ESJsonEncoder.field_mappings]
    Timestamp = "@timestamp"
    Severity = "level"

[ElasticSearchOutput]
message_matcher = "TRUE"
encoder = "ESJsonEncoder"
flush_interval = 1

導入到es中，也需要json，所以使用ESJsonEncoder，同時指定索引名字和類型。執行結果如下，

可以看到，除了heka中元數據field之外，還有JsonDecoder生成field啊，其實是截取JsonDecoder中的fields屬性中拿出。注意，Payload不解析。

:Fields:
    | name:"time" type:string value:"2015-05-06T    20:40:05.509926234Z"
    | name:"msg" type:string value:"Start Request"
    | name:"userid" type:string value:"11"
    | name:"event" type:string value:"artemis.web.ensure-running2"
    | name:"extra.workspace-id" type:string value:"cN907xLngi"

這些field當然隨著數據不同而不同，那么稱之為dynamic fileds。

入es的時候，可以指定提取哪些dynamic fields，

fields=["Timestamp","Uuid","Type","Logger","Pid","Hostname","DynamicFields"]
dynamic_fields=["msg","userid"]

只要使用dynamic_fileds，就必須要在fields中指定DynamicFields。

如果沒有dynamic_fileds，那么fields只能列舉幾個固定的屬性，參照官方文檔即可。

完成的列子：

[hekad]
maxprocs = 2

[KafkaInputExample]
type = "KafkaInput"
topic = "test"
addrs = ["localhost:9092"]
decoder="JsonDecoder"

[JsonDecoder]
type = "SandboxDecoder"
[hekad]
maxprocs = 2

[KafkaInputExample]
type = "KafkaInput"
topic = "test"
addrs = ["localhost:9092"]
decoder="JsonDecoder"

[JsonDecoder]
type = "SandboxDecoder"
filename = "lua_decoders/json.lua"

        [JsonDecoder.config]
        type = "artemis"
        payload_keep = true
        map_fields = true
        Severity = "severity"

[ESJsonEncoder]
index = "%{Type}-%{%Y.%m.%d}"
es_index_from_timestamp = true
type_name = "%{Type}"
fields=["Timestamp","Uuid","Type","Logger","Pid","Hostname","DynamicFields"]
dynamic_fields=["msg","userid"]

raw_bytes_fields=["Payload"]
    [ESJsonEncoder.field_mappings]
    Timestamp = "@timestamp"
    Severity = "level"

[ElasticSearchOutput]
message_matcher = "TRUE"
encoder = "ESJsonEncoder"
flush_interval = 1

結果如下，

上述就是小編為大家分享的heka從kalka中讀取數據的示例分析了，如果剛好有類似的疑惑，不妨參照上述分析進行理解。如果想知道更多相關知識，歡迎關注創新互聯行業資訊頻道。