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From "Rob Wilkerson" <r.d.wilker...@gmail.com>
Subject Re: [users@httpd] SOT: Subversion Connection to Apache Fails Mid-Stream
Date Mon, 21 Aug 2006 23:09:26 GMT
I'll take another look, but I don't recall seeing anything that looked
out of the ordinary.  I did a tcpdump while performing a commit and
that looked okay, too, I guess.  I have no idea what a lot of it
means, but here's the summary:

username [~]$ sudo /usr/sbin/tcpdump host balt-002494 and port 80 >>
~/tcpdump.out
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth0, link-type EN10MB (Ethernet), capture size 96 bytes
44502 packets captured
89010 packets received by filter
0 packets dropped by kernel

A tail on the output doesn't show anything that looks out of the
ordinary - at least not to a layman.  Just in case, though, I've
pasted it below:

18:54:35.173448 IP seprojects.mydomain.com.http >
balt-002494.mydomain.com.interactionweb: S 1002731913:1002731913(0)
ack 3899603588 win 5840 <mss 1460,nop,nop,sackOK>
18:54:35.176655 IP balt-002494.mydomain.com.interactionweb >
seprojects.mydomain.com.http: . ack 1 win 65535
18:54:35.176736 IP balt-002494.mydomain.com.interactionweb >
seprojects.mydomain.com.http: P 1:516(515) ack 1 win 65535
18:54:35.184612 IP seprojects.mydomain.com.http >
balt-002494.mydomain.com.interactionweb: . ack 516 win 6432
18:54:35.441586 IP seprojects.mydomain.com.http >
balt-002494.mydomain.com.interactionweb: P 1:306(305) ack 516 win 6432
18:54:35.441972 IP seprojects.mydomain.com.http >
balt-002494.mydomain.com.interactionweb: F 306:306(0) ack 516 win 6432
18:54:35.445499 IP balt-002494.mydomain.com.interactionweb >
seprojects.mydomain.com.http: F 516:516(0) ack 306 win 65230
18:54:35.445639 IP mydomain.sysalli.com.http >
balt-002494.mydomain.com.interactionweb: . ack 517 win 6432
18:54:35.445515 IP balt-002494.mydomain.com.interactionweb >
seprojects.mydomain.com.http: . ack 307 win 65230

Does it mean anything to you?

On 8/21/06, Joshua Slive <joshua@slive.ca> wrote:
> On 8/21/06, Rob Wilkerson <r.d.wilkerson@gmail.com> wrote:
> > I'll take a look at the forensics and the packet trace.  The server is
> > on a LAN - I don't believe there are any proxies involved, but I'm not
> > the guy who has to put together the servers.  I'm just the guy that
> > has to communicate with them.  I'll ask about that.  A tracert,
> > though, shows no hops between the client and the server.
> >
> > Subversion provides atomic commits so, although I see no evidence on
> > the server side, I assume that's because the commit process failed so
> > Subversion actually committed nothing.  And, to be honest, I can't be
> > completely sure the commit fails mid-stream, but I See a lot of
> > generated output indicating the process is doing what it's supposed to
> > (adding and removing files from the repository) and then the failure
> > message.  That's what leads me to think it's a mid-stream failure.  If
> > someone who knows more than I do (should be a lot of those people
> > about) can offer another suggestion, I'm all ears.
>
> Apache logs every request it receives.  So regardless of whether the
> commit transaction fails or not, there should be stuff in the apache
> access_log.  If there is not, it indicates that either apache didn't
> receive the request at all, or that the apache process serving the
> request crashed before it could do the logging.  In the latter case,
> you would usually see a segmentation fault signalled in the error log.
>
> Joshua.
>
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-- 

Rob Wilkerson

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