[Bug 4276] New: Python tracebacks serving web requests: RevlogError

[mercurial-bugs at selenic.com]

http://bz.selenic.com/show_bug.cgi?id=4276

          Priority: normal
            Bug ID: 4276
                CC: mercurial-devel at selenic.com
          Assignee: bugzilla at selenic.com
           Summary: Python tracebacks serving web requests: RevlogError
          Severity: bug
    Classification: Unclassified
                OS: Linux
          Reporter: bkero at mozilla.com
          Hardware: PC
            Status: UNCONFIRMED
           Version: 2.5.4
         Component: hgweb
           Product: Mercurial

We're experiencing random failed transactions serving the following:

http://hg.mozilla.org/releases/l10n/mozilla-release/nb-NO/

We're using the 'Siege' tool to perform stress testing against out hgweb
infrastructure and discovered that over many requests, the following issue
exists.

The repo can be obtained at http://people.mozilla.org/~bkero/nb-NO.tar.gz

We've seen this error served in production using mod_wsgi being served by
apache.

(In another terminal)
$ siege
http://hg.mozilla.org/releases/l10n/mozilla-release/nb-NO/FIREFOX_31_0_RELEASE.tar.bz2
# which simply renders the index

    [Wed Jun 11 00:30:57 2014] [error] [client 10.2.10.5] mod_wsgi (pid=5686):
Exception occurred processing WSGI script
'/repo_local/mozilla/webroot_wsgi/releases/l10n/mozilla-release/hgweb.wsgi'.
    [Wed Jun 11 00:30:57 2014] [error] [client 10.2.10.5] Traceback (most
recent call last):
    [Wed Jun 11 00:30:57 2014] [error] [client 10.2.10.5]   File
"/usr/lib64/python2.6/site-packages/mercurial/hgweb/hgwebdir_mod.py", line 153,
in __call__
    [Wed Jun 11 00:30:57 2014] [error] [client 10.2.10.5]     return
self.run_wsgi(req)
    [Wed Jun 11 00:30:57 2014] [error] [client 10.2.10.5]   File
"/usr/lib64/python2.6/site-packages/mercurial/hgweb/hgwebdir_mod.py", line 217,
in run_wsgi
    [Wed Jun 11 00:30:57 2014] [error] [client 10.2.10.5]     return
hgweb(repo).run_wsgi(req)
    [Wed Jun 11 00:30:57 2014] [error] [client 10.2.10.5]   File
"/usr/lib64/python2.6/site-packages/mercurial/hgweb/hgweb_mod.py", line 240, in
run_wsgi
    [Wed Jun 11 00:30:57 2014] [error] [client 10.2.10.5]     content =
getattr(webcommands, cmd)(self, req, tmpl)
    [Wed Jun 11 00:30:57 2014] [error] [client 10.2.10.5]   File
"/usr/lib64/python2.6/site-packages/mercurial/hgweb/webcommands.py", line 804,
in archive
    [Wed Jun 11 00:30:57 2014] [error] [client 10.2.10.5]     cnode =
web.repo.lookup(key)
    [Wed Jun 11 00:30:57 2014] [error] [client 10.2.10.5]   File
"/usr/lib64/python2.6/site-packages/mercurial/localrepo.py", line 662, in
lookup
    [Wed Jun 11 00:30:57 2014] [error] [client 10.2.10.5]     return
self[key].node()
    [Wed Jun 11 00:30:57 2014] [error] [client 10.2.10.5]   File
"/usr/lib64/python2.6/site-packages/mercurial/localrepo.py", line 385, in
__getitem__
    [Wed Jun 11 00:30:57 2014] [error] [client 10.2.10.5]     return
context.changectx(self, changeid)
    [Wed Jun 11 00:30:57 2014] [error] [client 10.2.10.5]   File
"/usr/lib64/python2.6/site-packages/mercurial/context.py", line 53, in __init__
    [Wed Jun 11 00:30:57 2014] [error] [client 10.2.10.5]     self._rev =
repo.changelog.rev(changeid)
    [Wed Jun 11 00:30:57 2014] [error] [client 10.2.10.5]   File
"/usr/lib64/python2.6/site-packages/mercurial/changelog.py", line 184, in rev
    [Wed Jun 11 00:30:57 2014] [error] [client 10.2.10.5]     r =
super(changelog, self).rev(node)
    [Wed Jun 11 00:30:57 2014] [error] [client 10.2.10.5]   File
"/usr/lib64/python2.6/site-packages/mercurial/revlog.py", line 290, in rev
    [Wed Jun 11 00:30:57 2014] [error] [client 10.2.10.5]     return
self._nodecache[node]
    [Wed Jun 11 00:30:57 2014] [error] [client 10.2.10.5] RevlogError

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