我有一个树节点cassandra集群。
当我从java客户端请求大量数据时，服务器端会出现以下警告：

WARN SELECT * FROM [...] time 789 msec - slow timeout 500 msec/cross-node
 WARN SELECT * FROM [...] time 947 msec - slow timeout 500 msec/cross-node
 WARN SELECT * FROM [...] time 1027 msec - slow timeout 500 msec/cross-node
 WARN SELECT * FROM [...] time 819 msec - slow timeout 500 msec/cross-node

客户端，我以以下异常结束：
java.util.concurrent.executionexception异常：
com.datastax.driver.core.exceptions.transportexception:
[/x.y.z.a:9042]连接已关闭
我的服务器配置yaml如下：

# How long the coordinator should wait for read operations to complete

 read_request_timeout_in_ms: 5000
 # How long the coordinator should wait for seq or index scans to complete
 range_request_timeout_in_ms: 10000
 # 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
 # How long a coordinator should continue to retry a CAS operation
 # that contends with other proposals for the same row
 cas_contention_timeout_in_ms: 1000
 # How long the coordinator should wait for truncates to complete
 # (This can be much longer, because unless auto_snapshot is disabled
 # we need to flush first so we can snapshot before removing the data.)
 truncate_request_timeout_in_ms: 60000
 # The default timeout for other, miscellaneous operations
 request_timeout_in_ms: 10000

我找不到任何“500毫秒”超时的参考。那我怎么调整这个超时？在查询大量分区/数据时，是否有避免以异常结束的选项？
作为补充说明，我使用future以异步方式检索数据：

import com.datastax.driver.core.ResultSetFuture;