cassandra大表读写timeout的配置解决

程序异常如下：Caused by: com.datastax.driver.core.exceptions.WriteTimeoutException: Cassandra timeout during write query at consistency LOCAL_ONE (1 replica were required but only 0 acknowledged the write)

原因很显然是coordinator，就是node没有及时响应写完成

解决方法无外乎，减少数据量，提高超时时间

在cassandra.yaml里

# How long the coordinator should wait for writes to complete
write_request_timeout_in_ms: 2000
# How long the coordinator should wait for counter writes to complete
counter_write_request_timeout_in_ms: 5000

将这2项都调大，默认是2s和5s

调整后，重启节点生效

ps auwx | grep cassandra
sudo kill pid
bin/cassandra