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https://issues.apache.org/jira/browse/TS-4461?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15298965#comment-15298965
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Peter Chou commented on TS-4461:
--------------------------------
Just curious if you have the inactivity cop time-out set for 10-minutes or not
in your scenario? We experienced a similar issue with 6.1.1 in our lab testing
when ATS would become unresponsive to client requests under heavy load. After
the load was stopped, ATS continued to ignore client requests (single curl
requests) for > 1-hour. It seemed locked up with 0 active connections
internally, but approximately throttle-limit established connections reported
with 'netstat -na'. After we set inactivity-cop to 300-seconds from
86400-seconds it seemed to avoid the locked-up condition but resulted in
TS-4475 periodic core-dumps some time later (no load just sitting there). Do
you think our results fall under this issue?
> 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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