suclogger commented on issue #386: 4.3事务消息回查功能 URL: https://github.com/apache/rocketmq/issues/386#issuecomment-409488407 代码实现是在每次查询时取同一producerGroup下可用producer回查，极端情况producer异常退出channel任然被broker持有导致回查失败，下一次回查会路由到不同producer上。可以观察broker端是否有类似“Check transaction failed because invoke producer exception”的错误日志来确认是否请求到了异常的channel上。 另外最好贴一下你的相关代码实现和配置，最好有日志输出便于大家分析。
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