Question

我正在尝试将数据从Postgresql服务器迁移到elasticsearch。 postgres数据为JSONB格式。在上河时，出现以下错误。

 [INFO ][logstash.agent ] Successfully started Logstash API endpoint {:port=>9600}
 [2019-01-07T14:22:34,625][INFO ][logstash.inputs.jdbc ] (0.128981s) SELECT to_json(details) from inventory.retailer_products1 limit 1
 [2019-01-07T14:22:35,099][WARN ][logstash.inputs.jdbc ] Exception when executing JDBC query {:exception=>#<Sequel::DatabaseError: Java::OrgLogstash::MissingConverterException: Missing Converter handling for full class name=org.postgresql.util.PGobject, simple name=PGobject>}
 [2019-01-07T14:22:36,568][INFO ][logstash.pipeline ] Pipeline has terminated {:pipeline_id=>"main", :thread=>"#<Thread:0x6067806f run>"}

我认为logstash无法识别JSON数据类型。

下面是我的logstash conf文件

    input {
        jdbc {
            jdbc_connection_string => "jdbc:postgresql://localhost:5432/mydb"
            jdbc_user => "postgres"
            jdbc_password => "password"
            jdbc_validate_connection => true
            jdbc_driver_library => "/home/dell5/Downloads/postgresql-9.4.1208.jar"
            jdbc_driver_class => "org.postgresql.Driver"
            statement => "SELECT to_json(details) from inventory.retailer_products1 limit 1"
        }
    }

filter{
    json{
        source => "to_json"
    }
}

output {
    elasticsearch {
        index => "products-retailer"
        document_type => "mapping-retailer"
        hosts => "localhost"
        }
        stdout{}
    }

为此我定义的映射如下

{
"products-retailer": {
    "mappings": {
        "mapping-retailer": {
            "dynamic": "false",
                "properties": {
                    "category": {
                        "type": "keyword"
                    },
                    "id": {
                        "type": "keyword"
                    },
                   "products": {
                        "type": "nested",
                        "properties": {
                                "barcode": {
                                    "type": "text"
                                },
                                "batchno": {
                                    "type": "text"
                                },
                                "desc": {
                                    "type": "text"
                                },
                                "expirydate": {
                                    "type": "date",
                                    "format": "YYYY-MM-DD"
                                },
                                "imageurl": {
                                    "type": "text"
                                },
                                "manufaturedate": {
                                    "type": "date",
                                    "format": "YYYY-MM-DD"
                                },
                                "mrp": {
                                    "type": "text"
                                },
                                "name": {
                                    "type": "text",
                                    "fields": {
                                        "ngrams": {
                                            "type": "text",
                                            "analyzer": "autocomplete"
                                        }
                                    }
                                },
                                "openingstock": {
                                    "type": "text"
                                },
                                "price": {
                                    "type": "text"
                                },
                                "purchaseprice": {
                                    "type": "text"
                                },
                                "sku": {
                                     "type": "text"
                                },
                                "unit": {
                                    "type": "text"
                                }
                            }
                        },
                        "retailerid": {
                            "type": "keyword"
                        },
                        "subcategory": {
                            "type": "keyword"
                        }
                    }
                }
            }
        }
    }

postgres列中的示例数据如下。它嵌套了我在elasticsearch映射中定义的json。

{
    "id": "",
    "Category": "Bread and Biscuits",
    "products": {
        "MRP": "45",
        "SKU": "BREAD-1",
        "Desc": "Brown Bread",
        "Name": "Brown Bread",
        "Unit": "Packets",
        "Brand": "Britannia",
        "Price": "40",
        "BarCode": "1234567890",
        "BatchNo": "456789",
        "ImageUrl": "buscuits.jpeg",
        "ExpiryDate": "2019-06-01",
        "OpeningStock": "56789",
        "PurchasePrice": "30",
        "ManufactureDate": "2018-11-01"
    },
    "RetailerId": "1",
    "SubCategory": "Bread"
}

请建议我在这里缺少什么，如果这样做是正确的方法。

我正在使用Elasticsearch 6.5.1。 PostgreSQL 9.5。

Answer 1

我今天遇到了相同的错误，看来Logstash无法转换Postgres json或jsonb数据字段（PgObject）。

我将对象字段转换为TEXT数据类型，它停止对我大喊大叫并开始提取数据。至于索引是否正确，还有待观察。

如果我有更好的主意，那么我将更新我的回答，如果这是正确的方法。

Answer 2

PGObject不具有转换来自to_json方法的json的功能。使用内部转换将jsonobject转换为这样的文本。

从清单.retailer_products1限制1中选择to_json（details）:: text。

现在您可以在logstash中解析json字符串。

无法将JSON从PostgreSQL插入elasticsearch。得到错误-“执行JDBC查询时发生异常”

2 个答案: