[arvados] keepproxy's own loop blocks data upload

[Yongjian Guo]

Hi, Everyone,

When I install the system on our machine, I noticed the following problem:

My keep service has three items: one proxy and two disk. When I upload data
using arv, I noticed in the proxy debug message:

2017/09/06 08:32:01 DEBUG: [365a8581] Begin upload
0f1d6bcf55c34bed7f92a805d2d89bbf to https://keepproxy-arvados.code.cn:443
2017/09/06 08:32:01 DEBUG: [365a8581] Replicas remaining to write: 2 active
uploads: 1
2017/09/06 08:32:01 proxy loop detected (request has Via: "HTTP/1.0
keepproxy"): perhaps keepproxy is misidentified by gateway config as an
external client, or its keep_services record does not have
service_type=proxy?
2017/09/06 08:32:01 DEBUG: [365a8581] Upload
https://keepproxy-arvados.code.cn:443/0f1d6bcf55c34bed7f92a805d2d89bbf
error: 500 response: loop detected
2017/09/06 08:32:01 DEBUG: [365a8581] Replicas remaining to write: 2 active
uploads: 0
2017/09/06 08:32:01 DEBUG: [365a8581] Begin upload
0f1d6bcf55c34bed7f92a805d2d89bbf to https://keepproxy-arvados.code.cn:443
2017/09/06 08:32:01 DEBUG: [365a8581] Replicas remaining to write: 2 active
uploads: 1
2017/09/06 08:32:01 proxy loop detected (request has Via: "HTTP/1.0
keepproxy"): perhaps keepproxy is misidentified by gateway config as an
external client, or its keep_services record does not have
service_type=proxy?
2017/09/06 08:32:01 DEBUG: [365a8581] Upload
https://keepproxy-arvados.code.cn:443/0f1d6bcf55c34bed7f92a805d2d89bbf
error: 500 response: loop detected
2017/09/06 08:32:01 DEBUG: [365a8581] Replicas remaining to write: 2 active
uploads: 0
2017/09/06 08:32:01 DEBUG: [365a8581] Begin upload
0f1d6bcf55c34bed7f92a805d2d89bbf to https://keepproxy-arvados.code.cn:443
2017/09/06 08:32:01 DEBUG: [365a8581] Replicas remaining to write: 2 active
uploads: 1
2017/09/06 08:32:01 proxy loop detected (request has Via: "HTTP/1.0
keepproxy"): perhaps keepproxy is misidentified by gateway config as an
external client, or its keep_services record does not have
service_type=proxy?
2017/09/06 08:32:01 DEBUG: [365a8581] Upload
https://keepproxy-arvados.code.cn:443/0f1d6bcf55c34bed7f92a805d2d89bbf
error: 500 response: loop detected
2017/09/06 08:32:01 127.0.0.1:42488 PUT /0f1d6bcf55c34bed7f92a805d2d89bbf
413 12 2 0  Could not write sufficient replicas: [500] loop detected


It looks that the keepproxy keeps writing to itself. I checked the source
code and feel it is in the array  of WritableLocalRoots.

Do you know if there is a way to go around this problem?

Thanks,

Jason
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