WSO2BAM REST流輸入到BAM / Cassandra； 無法使用配置單元查詢獲取EVENT_KS數據？

Question

該問題的背景本質上是Sachini Jayasekara @ WSO2 撰寫的一篇文章，該文章稱為《 將不同的報告框架與WSO2業務活動監視器一起使用》 。 我或多或少地完全一樣，只是使用REST API定義數據流並調用REST WS API將數據推送到BAM中。 然后使用HIVE查詢獲取數據。 但是，似乎我錯過了一些東西，因為未顯示屬性數據。 因此查詢。

當前使用通過基於Perl的守護程序調用的REST api。 這將使用以下流定義和有效負載來調用REST API：

{
  "name":"currentcostRealtime2.stream",
  "version": "1.0.6",
  "nickName": "Currentcost Realtime",
  "description": "This is the Currentcost realtime stream",
  "payloadData":[
    {
      "name":"sensor",
      "type":"INT"
    },
    {
      "name":"temp",
      "type":"FLOAT"
    },
    {
      "name":"timestamp",
      "type":"STRING"
    },
    {
      "name":"watt",
      "type":"INT"
    }
  ]
}

..和有效載荷定義..

[
 {
   "payloadData" : [SENSOR, TEMP, "TIMESTAMP", WATT] ,
 }
]

我應該注意，有效載荷在提交之前已被字符串替換； 例如，提交的實際有效負載如下所示：

[
 {
   "payloadData" : [1, 18.7, "2014-06-15 16:15:56", 1] ,
 }
]

查詢執行沒有明顯問題，但是我現在在BAM中遇到了HIVE查詢問題，這使我可以輸入條目，但不能輸出值。 例如，現在嘗試執行以下HIVE查詢：

CREATE TABLE IF NOT EXISTS CurrentCostDataTemp ( sensor INT, temp FLOAT, ts TIMESTAMP, watt INT ) 
STORED BY 'org.apache.hadoop.hive.cassandra.CassandraStorageHandler'
WITH SERDEPROPERTIES ( "cassandra.host" = "127.0.0.1",
    "cassandra.port" = "9160",
    "cassandra.ks.name" = "EVENT_KS",
    "cassandra.ks.username" = "admin",
    "cassandra.ks.password" = "admin",
    "cassandra.cf.name" = "currentcostRealtime2_stream",
    "cassandra.columns.mapping" = "payload_sensor, payload_temp, payload_timestamp, payload_watt" );

select * from CurrentCostDataTemp;                                  

..但這僅給出以下內容（請參見下面的特定圖片）-例如，沒有顯示的屬性級別數據。 但是，很明顯，有給定的EVENT_KS條目輸出了4行..所以問題是我如何引用數據以提取值，或者還有其他我不知道的事情？

key sensor  temp    ts  watt
1402816273765::192.168.1.106::9443::52              
1402815283659::192.168.1.106::9443::51              
1402815238323::192.168.1.106::9443::49              
1402815280532::192.168.1.106::9443::50              

通過使用Cqlsh檢查已驗證數據在Cassandra中-參見此處：

cqlsh:EVENT_KS> select * from "currentcostRealtime_stream";

 key                                    | Description                             | Name                       | Nick_Name            | StreamId                         | Timestamp     | Version | meta_ipAdd | payload_sensor | payload_temp | payload_timestamp   | payload_watt
----------------------------------------+-----------------------------------------+----------------------------+----------------------+----------------------------------+---------------+---------+------------+----------------+--------------+---------------------+--------------
 1402815283659::192.168.1.106::9443::51 | This is the Currentcost realtime stream | currentcostRealtime.stream | Currentcost Realtime | currentcostRealtime.stream:1.0.5 | 1402815283659 |   1.0.5 |       null |              1 |         18.7 | 2014-06-15 14:54:43 |            1
 1402815238323::192.168.1.106::9443::49 | This is the Currentcost realtime stream | currentcostRealtime.stream | Currentcost Realtime | currentcostRealtime.stream:1.0.5 | 1402815238323 |   1.0.5 |       null |              1 |         18.7 | 2014-06-15 14:53:58 |            1
 1402815280532::192.168.1.106::9443::50 | This is the Currentcost realtime stream | currentcostRealtime.stream | Currentcost Realtime | currentcostRealtime.stream:1.0.5 | 1402815280532 |   1.0.5 |       null |              1 |         18.7 | 2014-06-15 14:54:40 |            1
 1402816273765::192.168.1.106::9443::52 | This is the Currentcost realtime stream | currentcostRealtime.stream | Currentcost Realtime | currentcostRealtime.stream:1.0.5 | 1402816273765 |   1.0.5 |       null |              1 |         18.7 | 2014-06-15 15:11:13 |            1

(4 rows)

cqlsh:EVENT_KS>

很可能只是我所監督的一個小問題，但是如果其他人看到了這個問題並且也可以做出回應，那將是一個很大的問題。

在外部將遠程表定義添加到MySQL DB時，將創建表和所有表，但似乎問題在於要獲取EVENT_KS表本身中的屬性數據，並通過HIVE腳本創建和訪問該屬性數據。

提前致謝！

/約根

[更新-19日星期四-已解決]可以解決此問題，並提供了一些提示。 下面的代碼現在可以正常工作了，這很好..非常感謝您抽出寶貴的時間來回復大家。

drop table CurrentCostDataTemp10;
drop table CurrentCostDataTemp_Summary10;

CREATE EXTERNAL TABLE IF NOT EXISTS CurrentCostDataTemp10 ( messageRowID STRING, payload_sensor INT, messageTimestamp BIGINT, payload_temp FLOAT, payload_timestamp BIGINT, payload_timestampmysql STRING, payload_watt INT ) 
STORED BY 'org.apache.hadoop.hive.cassandra.CassandraStorageHandler'
WITH SERDEPROPERTIES ( "cassandra.host" = "127.0.0.1",
  "cassandra.port" = "9160",
  "cassandra.ks.name" = "EVENT_KS",
  "cassandra.ks.username" = "<USER>",
  "cassandra.ks.password" = "<PASSWORD>",
  "cassandra.cf.name" = "currentcostsimple5_stream",
  "cassandra.columns.mapping" = ":key, payload_sensor, Timestamp, payload_temp, payload_timestamp, payload_timestampmysql, payload_watt" );

CREATE EXTERNAL TABLE IF NOT EXISTS CurrentCostDataTemp_Summary10 ( messageRowID STRING, payload_sensor INT, messageTimestamp BIGINT, payload_temp FLOAT, payload_timestamp BIGINT, payload_timestampmysql STRING, payload_watt INT ) 
STORED BY 'org.wso2.carbon.hadoop.hive.jdbc.storage.JDBCStorageHandler'
TBLPROPERTIES (
  'mapred.jdbc.driver.class' = 'com.mysql.jdbc.Driver',
  'mapred.jdbc.url' = 'jdbc:mysql://127.0.0.1:8889/currentcost' ,
  'mapred.jdbc.username' = '<USER>',
  'mapred.jdbc.password' = '<PASSWORD>',
  'hive.jdbc.update.on.duplicate'= 'true',
  'hive.jdbc.primary.key.fields' = 'messageRowID',
  'hive.jdbc.table.create.query' = 'CREATE TABLE CurrentCostDataTemp1 ( messageRowID VARCHAR(100) NOT NULL PRIMARY KEY, payload_sensor TINYINT(4), messageTimestamp BIGINT, payload_temp FLOAT, payload_timestamp BIGINT, payload_timestampmysql DATETIME, payload_watt INT ) ');

insert overwrite table CurrentCostDataTemp_Summary10 select messageRowID, payload_sensor, messageTimestamp, payload_temp, payload_timestamp, payload_timestampmysql, payload_watt FROM CurrentCostDataTemp10;

將不同的報告框架與WSO2業務活動監視器配合使用。 薩基尼·賈亞塞卡拉

Answer 1

嘗試如下更改腳本的第一行。

如果不存在，則創建EXTERNAL表CurrentCostDataTemp（ key STRING ，傳感器INT，溫度FLOAT，ts TIMESTAMP，瓦特INT）

（如果出現錯誤，請刪除key STRING部分。）

注意：如果您已經創建了DROP TABLE CurrentCostDataTemp ，則可能需要在運行之前運行它。

Answer 2

我已將您的查詢修改如下。 請嘗試一下。

CREATE external TABLE IF NOT EXISTS CurrentCostDataTemp ( key string, sensor INT, temp FLOAT, ts TIMESTAMP, watt INT ) 
STORED BY 'org.apache.hadoop.hive.cassandra.CassandraStorageHandler'
WITH SERDEPROPERTIES ( "cassandra.host" = "127.0.0.1",
    "cassandra.port" = "9160",
    "cassandra.ks.name" = "EVENT_KS",
    "cassandra.ks.username" = "admin",
    "cassandra.ks.password" = "admin",
    "cassandra.cf.name" = "currentcostRealtime2_stream",
    "cassandra.columns.mapping" = ":key,payload_sensor, payload_temp, payload_timestamp, payload_watt" );

select * from CurrentCostDataTemp;