cassandra大表讀寫timeout的配置解決

程序異常如下：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)

原因很顯然是coordinator，就是node沒有及時響應寫完成

解決方法無外乎，減少數據量，提高超時時間

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

將這2項都調大，默認是2s和5s

調整后，重啟節點生效

ps auwx | grep cassandra
sudo kill pid
bin/cassandra