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ll},"comments":22,"created_at":"2015-01-21T00:55:40Z","updated_at":"2016-09-21T14:41:40Z","closed_at":"2016-09-21T14:41:40Z","body":"At this moment, creating TCP connections are created lazily on first call of a Channel, and if the TCP connection goes down it isn't reconnected until a subsequent call. However, some users will want the TCP connection to be created and maintained during the lifetime of the Channel.\r\n\r\nThis \"constant connection\" behavior does not make as much sense when accessing a third party service, as the service may purposefully be disconnecting idle clients, but is very reasonable in low-latency, intra-datacenter communication.\r\n\r\nWe need an API to choose between those behaviors and to export failure information about the Channel. All of this is bundled together for the moment under the name \"health-checking API,\" but we can split it apart as it makes sense.\r\n\r\nThey are tied together for the moment because certain operations like \"wait until Channel is healthy\" assume that the channel will actively try to connect.\r\n\r\nSome notes from @louiscryan:\r\n> Do we want to canonicalize transport failure modes into an enum or are we\r\n> happy with a boolean indicating transient vs. durable. What failure modes\r\n> will we have\r\n>\r\n> - wire incompatability which can occur at any time and while is in theory\r\n> transient you may not want your application to continue working\r\n> - unreachable\r\n> - internal implementation error\r\n> - redirection. the addressed service has moved elsewhere\r\n"}}
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