hive xml serDe:表为空 [英] hive xml serDe : table is empty

问题描述

我想将xml数据存储到hive表中，XML数据:

I want to store xml data into hive table, XML data :

<servicestatuslist>
   <recordcount>1266</recordcount> 
     <servicestatus id="435680">
     <status_text>/: 61%used(9714MB/15975MB) (<80%) : OK</status_text> 
     <display_name>/ Disk Usage</display_name> 
     <host_name>zabbix.vshodc.com</host_name> 
     </servicestatus>
</servicestatuslist>

我已将 jar 文件添加到路径

I have added jar file to path

hive> add jar /home/cloudera/HiveJars/hivexmlserde-1.0.5.1.jar ;    
Added /home/cloudera/HiveJars/hivexmlserde-1.0.5.1.jar to class path
Added resource: /home/cloudera/HiveJars/hivexmlserde-1.0.5.1.jar

我写了一个 hive serDe 查询:

I have written a hive serDe query:

 create table xml_AIR(id STRING, status_text STRING,display_name STRING ,host_name STRING)
    row format serde 'com.ibm.spss.hive.serde2.xml.XmlSerDe'
    with serdeproperties(
    "column.xpath.id"="/servicestatus/@id",
    "column.xpath.status_text"="/servicestatus/status_text/text()",
    "column.xpath.display_name"="/servicestatus/display_name/text()",
    "column.xpath.host_name"="/servicestatus/host_name/text()"
    )
    stored as
    inputformat 'com.ibm.spss.hive.serde2.xml.XmlInputFormat'
    outputformat 'org.apache.hadoop.hive.ql.io.IgnoreKeyTextOutputFormat'
    LOCATION  '/user/cloudera/input/air.xml'
    tblproperties(
    "xmlinput.start"="<servicestatus",
    "xmlinput.end"="</servicestatus>"
    );
    OK
    Time taken: 1.609 seconds

当我发出 select 命令时，它没有显示表的数据:

When I issued select command , it didn't show the table's data:

hive> select * from xml_AIR;       
OK
Time taken: 3.0 seconds

上面的代码有什么问题?请帮忙.

What's wrong in the above code? Please help.

推荐答案

我在处理 XML Serde 时遇到了同样的问题.经过一番努力，我通过单独使用加载数据"语句并避免在CREATE"语句中添加LOCATION"属性来修复它.以下是我的 XML 数据.

I came out through the same Problem when dealing with XML Serde. After some struggle, I fixed it by using the "Load data" statement separately and avoiding addition of "LOCATION" property in "CREATE" statement. the following is my XML data.

<record customer_id="0000-JTALA">
        <income>200000</income>     
        <demographics>
            <gender>F</gender>
            <agecat>1</agecat>
            <edcat>1</edcat>
            <jobcat>2</jobcat>
            <empcat>2</empcat>
            <retire>0</retire>
            <jobsat>1</jobsat>
            <marital>1</marital>
            <spousedcat>1</spousedcat>
            <residecat>4</residecat>
            <homeown>0</homeown>
            <hometype>2</hometype>
            <addresscat>2</addresscat>
        </demographics>
        <financial>
            <income>18</income>
            <creddebt>1.003392</creddebt>
            <othdebt>2.740608</othdebt>
            <default>0</default>
        </financial>
    </record>

CREATE TABLE 语句:

CREATE TABLE xml_bank(customer_id STRING, income BIGINT, demographics map<string,string>, financial map<string,string>)
ROW FORMAT SERDE 'com.ibm.spss.hive.serde2.xml.XmlSerDe'
WITH SERDEPROPERTIES (
"column.xpath.customer_id"="/record/@customer_id",
"column.xpath.income"="/record/income/text()",
"column.xpath.demographics"="/record/demographics/*",
"column.xpath.financial"="/record/financial/*"
)
STORED AS
INPUTFORMAT 'com.ibm.spss.hive.serde2.xml.XmlInputFormat'
OUTPUTFORMAT 'org.apache.hadoop.hive.ql.io.IgnoreKeyTextOutputFormat'
TBLPROPERTIES (
"xmlinput.start"="<record customer",
"xmlinput.end"="</record>"
);

创建查询结果:

OK
Time taken: 0.925 seconds
hive>

对于上面的 create 语句，我使用下面的LOAD DATA"语句将包含在 XML 文件中的数据加载到上面创建的表中.

for the above create statement, I used the following "LOAD DATA" statement to load the data contained in an XML file in to the above created table.

hive> load data local inpath '/home/mahesh/hive_input_datasets/XMLdata/XMLdatafile.xml' overwrite into table xml_bank6;

加载查询结果:

Copying data from file:/home/mahesh/hive_input_datasets/XMLdata/XMLdatafile.xml
Copying file: file:/home/mahesh/hive_input_datasets/XMLdata/XMLdatafile.xml
Loading data to table default.xml_bank6
Table default.xml_bank6 stats: [num_partitions: 0, num_files: 1, num_rows: 0, total_size: 500, raw_data_size: 0]
OK
Time taken: 0.879 seconds
hive>

最后，

hive> select * from xml_bank6;
OK
0000-JTALA  200000  {"empcat":"2","jobcat":"2","residecat":"4","retire":"0","hometype":"2","addresscat":"2","homeown":"0","spousedcat":"1","gender":"F","jobsat":"1","edcat":"1","marital":"1","agecat":"1"}    {"default":"0","income":"18","othdebt":"2.740608","creddebt":"1.003392"}
Time taken: 0.149 seconds, Fetched: 1 row(s)
hive>

在上面的查询中，我建议将 "xmlinput.start" 的值设为 "<servicestatus id"，而不是 "<servicestatus"，因为 XML 开始标记采用 <servicestatus id="some data"> 模式.我相信这对您有帮助.

And in the above query i would suggest the value for "xmlinput.start" as "<servicestatus id", instead of "<servicestatus",because the XML start tag is in the pattern <servicestatus id="some data">.I believe this would be helpful for you.

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