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我有非常简单的设置。我有 etcd 3.3 服务器。我在 python (3.6) 中有代码，我安装了 etcd3 版本 0.10.0

import etcd3
data = etcd3.client(host='my.host.net', port=2379).get('/exesiting/key'))
print( data )

密钥存在，服务器地址正常。此代码随机失败并出现以下错误

failed: grpc._channel._Rendezvous: <_Rendezvous of RPC that terminated with:
        status = StatusCode.UNKNOWN
        details = "Failed to create subchannel"
        debug_error_string = "{"created":"@1557133790.170407000","description":"Failed to create subchannel","file":"src/core/ext/filters/client_channel/client_channel.cc","file_line":2715,"referenced_errors":[{"created":"@1557133790.170402000","description":"Empty update","file":"src/core/ext/filters/client_channel/lb_policy/pick_first/pick_first.cc","file_line":270}]}"

怎么了？我需要以某种方式清理连接吗？

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