https://blog.csdn.net/qq_26502245/article/details/108510878

解决方法：
先将flume的JVM内存改为512M

capacity = 1000
transactionCapacity = 1000
keep-alive = 30

请求超时,导致发送event失败
解决：
设置request-timeout长一点，默认20秒

双层flume搭建过程中遇到的坑Avro source r1: Unable to process event batch.