host_pool:python库可跟踪远程主机状态，并将主机标记为失败

host_pool 跟踪远程主机列表的通用接口，以允许从发生故障的远程主机自动退避。 pool = host_pool.HostPool(['servera','serverb']) endpoint = pool.get() pool.success(endpoint) endpoint = pool.get() pool.failed(endpoint)