chenBright opened a new pull request, #1818:
URL: https://github.com/apache/incubator-brpc/pull/1818
使用Channel::Init("http://hostname";,
options)时，会在hostname2ip中通过gethostbyname_r获取dns的节点信息。如果hostname在dns中配置了很多节点，hostname2ip会因为aux_buf长度不够导致调用失败，从而导致Channel::Init失败。
解决方法：参考DomainNamingService获取节点信息的方法，当gethostbyname_r返回ERANGE，表示aux_buf长度不足时，将aux_buf长度增大一倍，重新调用gethostbyname_r获取节点信息，直到获取成功为止。
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