WSO2BAM REST流输入到BAM / Cassandra； 无法使用配置单元查询获取EVENT_KS数据？

Question

该问题的背景本质上是Sachini Jayasekara @ WSO2 撰写的一篇文章，该文章称为《 将不同的报告框架与WSO2业务活动监视器一起使用》 。 我或多或少地完全一样，只是使用REST API定义数据流并调用REST WS API将数据推送到BAM中。 然后使用HIVE查询获取数据。 但是，似乎我错过了一些东西，因为未显示属性数据。 因此查询。

当前使用通过基于Perl的守护程序调用的REST api。 这将使用以下流定义和有效负载来调用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"
    }
  ]
}

..和有效载荷定义..

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

我应该注意，有效载荷在提交之前已被字符串替换； 例如，提交的实际有效负载如下所示：

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

查询执行没有明显问题，但是我现在在BAM中遇到了HIVE查询问题，这使我可以输入条目，但不能输出值。 例如，现在尝试执行以下HIVE查询：

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;                                  

..但这仅给出以下内容（请参见下面的特定图片）-例如，没有显示的属性级别数据。 但是，很明显，有给定的EVENT_KS条目输出了4行..所以问题是我如何引用数据以提取值，或者还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              

通过使用Cqlsh检查已验证数据在Cassandra中-参见此处：

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>

很可能只是我所监督的一个小问题，但是如果其他人看到了这个问题并且也可以做出回应，那将是一个很大的问题。

在外部将远程表定义添加到MySQL DB时，将创建表和所有表，但似乎问题在于要获取EVENT_KS表本身中的属性数据，并通过HIVE脚本创建和访问该属性数据。

提前致谢！

/约根

[更新-19日星期四-已解决]可以解决此问题，并提供了一些提示。 下面的代码现在可以正常工作了，这很好..非常感谢您抽出宝贵的时间来回复大家。

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;

将不同的报告框架与WSO2业务活动监视器配合使用。 萨基尼·贾亚塞卡拉

Answer 1

尝试如下更改脚本的第一行。

如果不存在，则创建EXTERNAL表CurrentCostDataTemp（ key STRING ，传感器INT，温度FLOAT，ts TIMESTAMP，瓦特INT）

（如果出现错误，请删除key STRING部分。）

注意：如果您已经创建了DROP TABLE CurrentCostDataTemp ，则可能需要在运行之前运行它。

Answer 2

我已将您的查询修改如下。 请尝试一下。

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;