该警告意味着在使用SQLite作为Airflow元数据库的情况下，不应该将解析进程数设置为2。可以通过在Airflow配置文件中为SQLite设置合适的并发连接数来解决此问题。

在Airflow配置文件（airflow.cfg）中，将以下注释行的值更改为所需的值：

The SqlAlchemy pool size is the maximum number of database connections

in the pool. 0 indicates no limit.

#sql_alchemy_pool_size = 5

The SqlAlchemy pool recycle is the number of seconds a connection

can be idle in the pool before it is invalidated. This defaults to -1.

#sql_alchemy_pool_recycle = 1800

将上述值更改为：

The SqlAlchemy pool size is the maximum number of database connections

in the pool. 0 indicates no limit.

sql_alchemy_pool_size = 20

The SqlAlchemy pool recycle is the number of seconds a connection

can be idle in the pool before it is invalidated. This defaults to -1.

sql_alchemy_pool_recycle = 1800

这将为SQLite设置20个并发连接，以防止解析进程数过多引发警告。