问题描述
我想读取事务的元数据(Kafka 0.11.0.1 支持)，以便我可以确定特定事务 ID 的事务是否已提交.目前我正在从 _transactional_state 主题获取键和值，但它采用某种编码格式.以下是我在轮询 __transaction_state 主题时收到的一些相同的键/值:键 = 10000000mmm，值 = +' )
I want to read meta data for transaction (which is supported in Kafka 0.11.0.1) so that I can figure out that whether the transaction for a particular transactional ID has been committed or not. Currently I am getting the key and value from _transactional_state topic but it is in some encoded format.Below are some same key/value I received when I polled __transaction_state topic:key = 10000000mmm, value = � �����+'���������)
推荐答案
您可以在 kafka/tools/DumpLogSegments.scala 文件中查看 TransactionLogMessageParser 类的源代码为一个例子.它使用 TransactionLog 类中的 readTxnRecordValue 函数.该函数的第一个参数可以通过同一个类的 readTxnRecordKey 函数获取.
You can look to source code of TransactionLogMessageParser class inside kafka/tools/DumpLogSegments.scala file as an example. It uses readTxnRecordValue function from TransactionLog class. The first argument for this function could be retrieved via readTxnRecordKey function of the same class.
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