Question

我正在使用logstash创建从elasticsearch到crate.io的管道。以下是配置。

input{
 elasticsearch {
   hosts => "<host_name>:9200"
   index => "index1"
   query => '{ "size":10,"query": {"match_all": {} } }'
   }
}
filter{
    if!([bench_pose][M_Body_t]) {
            mutate{
                    add_field => {"[bench_pose][M_Body_t]" => null}
            }
    }
    if!([bench_pose][M_Jaw_t]) {
            mutate{
                    add_field => {"[bench_pose][M_Jaw_t]" => null}
            }
    }
}
output{
 jdbc {
       driver_class => "io.crate.client.jdbc.CrateDriver"
       driver_auto_commit => false
       driver_jar_path => "/etc/crate/crate-jdbc-standalone-1.12.3.jar"
       connection_string => "crate://<host_ip>:4300"
       statement => ["INSERT INTO table_name(path,bench_pose_m_Body_t,bench_pose_m_jaw_t) VALUES(?,?,?)",'path','%{[bench_pose][M_Body_t]}','%{[bench_pose][M_Jaw_t]}']
   }
}

来源有一个字段＆＃39; bench_pose＆＃39;它是OBJECT数据类型，bench_pose下的字段M_Body_t和M_Jaw_t的类型为DOUBLE。这些字段在源和目标中都是NULLable。此字段在源中的少数文档中具有空值。即使目标表具有NULLable字段，当insert语句遇到具有null值的文档时，也会抛出以下错误。

JDBC - Exception. Not retrying. {:exception=>java.sql.SQLException: Validation failed for bench_pose_m_body_t: 'null' cannot be cast to type double

如果我删除过滤器插件，则会抛出如下错误。

JDBC - Exception. Not retrying. {:exception=>java.sql.SQLException: Validation failed for bench_pose_m_body_t: '%{[bench_pose][M_Body_t]}' cannot be cast to type double

如果我在插入中硬编码空值并在crate sql上运行查询，它会正确执行。如何解析logstash中这些字段中的空值？

Answer 1

您需要将INSERT语句更改为：

   statement => ["INSERT INTO table_name(path,benc‌h_pose_m_Body_t,bench‌_pose_m_jaw_t) VALUES(?,TRY_CAST(? as double),TRY_CAST(? as double))",'path','%{[bench_pose][M_Body_t]}','%{[bench_pose][M_Jaw_t]}']

TRY_CAST将返回null，而不是在类型转换不兼容的情况下抛出错误。

java.sql.SQLException：<field_name>的验证失败：＆＃39; null＆＃39;不能强制转换为double类型

1 个答案: