异常The channel is full or unexpected failure. The source will try again after 1000 ms
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Flume采集的控制台提示：
The channel is full or unexpected failure. The source will try again after 1000 ms
这个是因为当前被采集的文件过大，深层的原因是文件采集的速度和sink的速度没有匹配好。所以应该可以通过增大keep-alive的值解决：
#channel中最多缓存多少
a1.channels.c1.capacity = 5000
#channel一次最多吐给sink多少
a1.channels.c1.transactionCapacity = 2000
#event的活跃时间
a1.channels.c1.keep-alive = 10
或者写到HDFS使用压缩，可以通过压缩来节省空间和网络流量，但是会增加cpu的消耗。
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