如何以自定义方式从主题还原全局存储?

时间:2019-01-03 10:46:55

标签: apache-kafka apache-kafka-streams

假设我从主题获取数据后正在将数据存储在Globalstore中时进行一些自定义处理,即我正在根据message的值创建自定义密钥。在本地删除状态后,它将以相同的方式再次恢复Globalstore吗?

override def process(key: String, value: String): Unit = {
logger.info("telephonyUsersProcessorCounter = "+telephonyUsersProcessorCounter)
telephonyUsersProcessorCounter  = telephonyUsersProcessorCounter +1
val telKey = processKey(key)
if (telKey.isDefined) {
  val telValue = processValue(value)

  if(telValue.isDefined ){

    StreamConstants.teleStore.get.put(telKey.get,telValue.get)
    val compositeKeyForNumber = telValue.get.enterpriseId + telValue.get.phoneNumber
    val compositeKeyForDeviceName =  telValue.get.enterpriseId +telValue.get.deviceName
    val compositeKeyForNumberAndDeviceName =  telValue.get.enterpriseId +telValue.get.phoneNumber+telValue.get.deviceName
    val telCompositeKeyForNumber =  StreamConstants.teleStore.get.get(compositeKeyForNumber)
    val telCompositeKeyForDeviceName =  StreamConstants.teleStore.get.get(compositeKeyForDeviceName)
    val telCompositeKeyForNumberAndDeviceName =  StreamConstants.teleStore.get.get(compositeKeyForNumberAndDeviceName)

    if(null !=telCompositeKeyForNumber ){
      if(telCompositeKeyForNumber.dateCreated.toLong < telValue.get.dateCreated.toLong){
        StreamConstants.teleStore.get.put(compositeKeyForNumber,telValue.get)
      }
    }else {
      StreamConstants.teleStore.get.put(compositeKeyForNumber,telValue.get)
    }

    if(null != telCompositeKeyForDeviceName){
      if(telCompositeKeyForDeviceName.dateCreated.toLong < telValue.get.dateCreated.toLong){
        StreamConstants.teleStore.get.put(compositeKeyForDeviceName,telValue.get)
      }
    }else {
      StreamConstants.teleStore.get.put(compositeKeyForDeviceName,telValue.get)
    }

    if(null != telCompositeKeyForNumberAndDeviceName){
      if(telCompositeKeyForNumberAndDeviceName.dateCreated.toLong < telValue.get.dateCreated.toLong){
        StreamConstants.teleStore.get.put(compositeKeyForNumberAndDeviceName,telValue.get)
      }
    }else {
      StreamConstants.teleStore.get.put(compositeKeyForNumberAndDeviceName,telValue.get)
    }
    context.forward(telKey.get, telValue.get.toJson.toString())
    context.forward(compositeKeyForNumber, telValue.get.toJson.toString())
    context.forward(compositeKeyForDeviceName, telValue.get.toJson.toString())
    context.forward(compositeKeyForNumberAndDeviceName, telValue.get.toJson.toString())

  }else {

    StreamConstants.teleStore.get.put(telKey.get,null)
    context.forward(telKey.get,null)
  }

}

}

使用消息值中的数据创建自定义键,而不是使用主题中的直接键。假设我已删除本地Global存储。从紧凑主题还原此商店时会发生什么?

1 个答案:

答案 0 :(得分:0)

在还原时,来自changelog主题的数据按原样放入全局存储,而跳过任何自定义处理器逻辑。这是一个已知问题:https://issues.apache.org/jira/browse/KAFKA-4963