我在模式注册表中有 3 个不同的主题和 3 个 Avro 文件,我想流式传输这些主题并将它们连接在一起并将它们写入一个主题。问题是我要加入的键与我将数据写入每个主题的键不同。
假设我们有这 3 个 Avro 文件:
Alarm:
{
"type" : "record",
"name" : "Alarm",
"namespace" : "com.kafkastream.schema.avro",
"fields" : [ {
"name" : "alarm_id",
"type" : "string",
"doc" : "Unique identifier of the alarm."
}, {
"name" : "ne_id",
"type" : "string",
"doc" : "Unique identifier of the network element ID that produces the alarm."
}, {
"name" : "start_time",
"type" : "long",
"doc" : "is the timestamp when the alarm was generated."
}, {
"name" : "severity",
"type" : [ "null", "string" ],
"doc" : "The severity field is the default severity associated to the alarm ",
"default" : null
}]
}
事件:
{
"type" : "record",
"name" : "Incident",
"namespace" : "com.kafkastream.schema.avro",
"fields" : [ {
"name" : "incident_id",
"type" : "string",
"doc" : "Unique identifier of the incident."
}, {
"name" : "incident_type",
"type" : [ "null", "string" ],
"doc" : "Categorization of the incident e.g. Network fault, network at risk, customer impact, etc",
"default" : null
}, {
"name" : "alarm_source_id",
"type" : "string",
"doc" : "Respective Alarm"
}, {
"name" : "start_time",
"type" : "long",
"doc" : "is the timestamp when the incident was generated on the node."
}, {
"name" : "ne_id",
"type" : "string",
"doc" : "ID of specific network element."
}]
}
维护:
{
"type" : "record",
"name" : "Maintenance",
"namespace" : "com.kafkastream.schema.avro",
"fields" : [ {
"name" : "maintenance_id",
"type" : "string",
"doc" : "The message number is the unique ID for every maintenance"
}, {
"name" : "ne_id",
"type" : "string",
"doc" : "The NE ID is the network element ID on which the maintenance is done."
}, {
"name" : "start_time",
"type" : "long",
"doc" : "The timestamp when the maintenance start."
}, {
"name" : "end_time",
"type" : "long",
"doc" : "The timestamp when the maintenance start."
}]
}
对于这些 Avro,我的 Kafka 中有 3 个主题(比如alarm_raw、incident_raw、maintenance_raw),每当我想写入这些主题时,我都会使用 ne_id 作为键(因此主题由 ne_id 分区)。现在我想加入这3个主题并获得一条新记录并将其写入一个新主题。问题是我想根据alarm_id和alarm_source_id加入警报和事件,并根据ne_id加入警报和维护。我想避免创建新主题并重新分配新密钥。无论如何,我在加入时指定了密钥吗?