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https://issues.apache.org/jira/browse/TS-4461?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15299166#comment-15299166
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Susan Hinrichs commented on TS-4461:
------------------------------------
Did a packet capture. Looks like we are getting some TCP keepalive messages
from the clients, so the other end of the socket must be active which explains
why the connections are still in established state.
Turned on debug for net_queue, and ATS things the active_queue and
keep_alive_queue sizes are 0. So we must either be not adding connections to
the queues. Or removing connections from the queues and not really closing
them.
I'm running the experiments again with http2 and spdy disabled. It should be
easy enough to replicate this in a dev environment with a client program that
doesn't close.
> Not closing client connections
> ------------------------------
>
> Key: TS-4461
> URL: https://issues.apache.org/jira/browse/TS-4461
> Project: Traffic Server
> Issue Type: Bug
> Components: Core
> Affects Versions: 6.2.0
> Reporter: Bryan Call
> Assignee: Susan Hinrichs
> Priority: Blocker
> Fix For: 7.0.0
>
>
> Looks like we are not closing client connections correctly on the 6.2.x
> branch. After taking a server our of rotation for awhile.
> {code}
> [bcall@l28 ~]$ ss -s
> Total: 18212 (kernel 18329)
> TCP: 18122 (estab 17141, closed 123, orphaned 4, synrecv 0, timewait
> 123/0), ports 152
> {code}
> in traffic top:
> {code}
> CLIENT ORIGIN SERVER
> Requests 1.8 Head Bytes 492.0 Requests 1.8 Head Bytes 345.7
> Req/Conn 1.0 Body Bytes 0.0 Req/Conn 1.0 Body Bytes 0.0
> New Conn 1.8 Avg Size 269.0 New Conn 1.8 Avg Size 189.0
> Curr Conn 0.0 Net (bits) 3.9K Curr Conn 0.0 Net (bits)
> 2.8K
> Active Con 6.6M Resp (ms) 0.8
> Dynamic KA 0.0
> {code}
> Looks like it is happening on the client connections to TLS ports (ip of the
> server removed):
> {code}
> [bcall@l28 ~]$ ss -tn | grep 'XXX:44[3-4]' | wc -l
> 12434
> {code}
> And not on the non-TLS ports
> {code}
> [bcall@l28 ~]$ ss -tn | grep 'XXX:8' | wc -l
> 0
> {code}
> Count of the fd for the traffic_server process:
> {code}
> [bcall@l28 ~]$ sudo ls -l /proc/$(pidof traffic_server)/fd | wc -l
> 18127
> {code}
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