国内时一些delete操作会报错 pool error Timeout waiting for idle object

白天稳定运行，晚上0点14分开始报错，请问如何解决？
```
Caused by: org.springframework.jdbc.CannotGetJdbcConnectionException: Could not get JDBC Connection; nested exception is org.apache.commons.dbcp.SQLNestedException: Cannot get a connection, pool error Timeout waiting for idle object
at org.springframework.jdbc.datasource.DataSourceUtils.getConnection(DataSourceUtils.java:80)

2019-09-12 07:38:23.261 [DubboServerHandler-127.0.0.1:2380-thread-50] WARN com.alibaba.otter.node.etl.load.LoadTask - WARN ## Task future processId[460759] canceled
```

因每天夜里0点10分会清理数据库中7天访问日志sql如下
```sql
delete from `logs_house_hits_hot` where created_at < '2019-09-03'
```
然后在node row_select会持续出现
```sql
delete from `logs_house_hits_hot` where `id` = ?
- PairId: 3 , TableId: 12 , EventType : D , Time : 1568218204000
- Consistency : , Mode :
```
Channel配置如下
Pipeline配置如下

Start with the reported Spring JDBC/DBCP stack trace, the scheduled SQL cleanup, and the node row_select delete events; review the Channel and Pipeline configurations shown in the issue. Done means identifying why the pool times out during nightly log deletion and documenting a verified fix or configuration change.

Written by the indexing model from the issue text.