ShardingTaskExecutorPoolMaxSize
Maximum number of outbound connections each TaskExecutor connection pool can open to any given mongod instance. The maximum possible connections to any given host across all TaskExecutor pools is
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连接池最大大小，默认没有限制
对于 mongod 最大连接控制：ShardingTaskExecutorPoolMaxSize * taskExecutorPoolSize
ShardingTaskExecutorPoolMinSize
Minimum number of outbound connections each TaskExecutor connection pool can open to any given mongod instance.
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连接池最小大小，默认为 1
taskExecutorPoolSize
The number of Task Executor connection pools to use for a given mongos. The parameter has a minimum value of 4 and a maximum value of 64.
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任务池大小，默认是 cpu 核数
ShardingTaskExecutorPoolMaxConnecting
Maximum number of simultaneous initiating connections (including pending connections in setup/refresh state) each TaskExecutor connection pool can have to a mongod instance. You can set this parameter to control the rate at which mongos adds connections to a mongod instance.
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并发进行初始连接的数量，默认没有限制，该值保持在 ShardingTaskExecutorPoolMaxSize 以下
ShardingTaskExecutorPoolRefreshRequirementMS
Maximum time the mongos waits before attempting to heartbeat a resting connection in the pool.
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连接池保活心跳的间隔时间，默认 1 分钟
ShardingTaskExecutorPoolRefreshTimeoutMS
Maximum time the mongos waits for a heartbeat before timing out the heartbeat
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连接池保活心跳的超时时间，默认 20 秒
ShardingTaskExecutorPoolHostTimeoutMS
Maximum time that mongos goes without communication to a host before mongos drops all connections to the host.
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空闲时间阈值，默认 30 秒，当 mongos 与 mongod 在指定时间内没有交互时会释放连接。
参考文档
https://docs.mongodb.com/v3.4/reference/parameters/#param.ShardingTaskExecutorPoolMaxSize
作者简介：
华为云专家唐章卓
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