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Posted to bugs@httpd.apache.org by bu...@apache.org on 2006/04/18 01:10:21 UTC
DO NOT REPLY [Bug 39329] New: - mod_dbd ap_dbd_acquire failure
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Summary: mod_dbd ap_dbd_acquire failure
Product: Apache httpd-2
Version: 2.2.0
Platform: All
OS/Version: All
Status: NEW
Severity: normal
Priority: P2
Component: Other Modules
AssignedTo: bugs@httpd.apache.org
ReportedBy: mkent@magoazul.com
I'm using mod_dbd with persistant mysql connections and another custom module to
do vhost document root lookups against a database.
The problems is that my mod_dbd connections reach the MySQL daemons wait_timeout
of 600 seconds and are closed automatically. ap_dbd_acquire fails for these
resources and returns NULL which leaves me without a db connection to work with.
Attached is a suggested patch to invalidate the bad resources and try to acquire
another a good one, which should be a newly opened and valid connection.
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DO NOT REPLY [Bug 39329] - mod_dbd ap_dbd_acquire failure
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------- Additional Comments From mkent@magoazul.com 2006-05-18 18:16 -------
(In reply to comment #6)
> Just revisiting this, I hacked (In reply to comment #0)
> > I'm using mod_dbd with persistant mysql connections and another custom
> module to
> > do vhost document root lookups against a database.
> >
> > The problems is that my mod_dbd connections reach the MySQL daemons
> wait_timeout
> > of 600 seconds and are closed automatically.
>
> Come to think of it, I thought mysql_ping (as used in the check_conn function)
> would reopen the connection if it had timed out. ISTR it doing that for me
> when I tested it.
>
> Adding a new patch (untested). Not decided whether to test and commit it.
Just tested the latest patch and it almost works but bumps into an issue I've
run into with mysql before: when a connection is closed the first mysql_ping
will always fail and the handle needs a second command to actually reopen the
connection despite what the manual says
(http://dev.mysql.com/doc/refman/5.0/en/mysql-ping.html). Made a slight change
to your patch and its working fine in testing so far.
Also, as noted in the manual page, as of 5.0.3 MYSQL_OPT_RECONNECT is not on by
default, the driver needs to set it after mysql_init like
mysql_options(&mysql, MYSQL_OPT_RECONNECT, &my_true)
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DO NOT REPLY [Bug 39329] - mod_dbd ap_dbd_acquire failure
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apache.ei@kefro.st changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |apache.ei@kefro.st
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DO NOT REPLY [Bug 39329] - mod_dbd ap_dbd_acquire failure
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------- Additional Comments From mkent@magoazul.com 2006-04-18 22:52 -------
(In reply to comment #4)
> DBDKeep is surely a maximum. The problem in question isn't going to apply to
> servers around peak load.
>
> The implication of looping would seem to be tearing down and opening lots of
> connections all at once - could be a Bad Thing. IMHO A better fix - which
> alas can't be easily retrofitted - would be to return an EAGAIN status and
> leave the application to retry.
That would be nice.
Just to give you an idea of how your code is being used; these servers are under
fairly heavy load but the lookup results are stored in memcached and eventually
the db connections begin to idle long enough to get killed off. Then every
minute or so a bad resource is acquired and nuked, adds a bit of fluff to the
error log, but works pretty well overall.
Thanks for looking at this so quickly.
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DO NOT REPLY [Bug 39329] - mod_dbd reconnection and prepared statements
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------- Additional Comments From daniel@bestningning.com 2007-08-22 07:33 -------
(In reply to comment #11)
> Just retested this with mod_dbd from trunk (r553563) and apr-util 1.2.7 +
> current apr_dbd_mysql.c compiled against MySQL 5.0.27 and everything works as
> expected with no modifications. Reconnection no longer seems to be an issue
as
> the need for 2 mysql_pings seems to have dissapeared, see the last couple
replies in
> http://bugs.mysql.com/bug.php?id=9271
> but I believe for any earlier MySQL versions it will still be required.
> Now the bad part is since mysql_ping in MySQL 5.0.27 (5.0.20 and later I
think)
> doesn't return an error anymore, just reconnects transparently, and since
> prepared statements are cleared as per
> http://www.mysql.org/doc/refman/5.0/en/auto-reconnect.html
> I'm not sure how you can detect that a mysql_ping has done a reconnection and
> reinit your prepared statements. I suppose you'd need to track the id of the
> mysql connection and look for a change before and after calling
apr_dbd_check_conn.
I tried the patch and found something might be a performance issue. this part
of the patch :
+ if ((rv == APR_SUCCESS) || (rv == APR_ENOTIMPL)) {
+ rv = dbd_prepared_init(pool, svr, rec);
+ break;
+ }
gets executed even if the first apr_dbd_check_conn returns a success. Is this
on purpose?
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DO NOT REPLY [Bug 39329] - mod_dbd ap_dbd_acquire failure
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jorton@redhat.com changed:
What |Removed |Added
----------------------------------------------------------------------------
Component|Other Modules |mod_dbd
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DO NOT REPLY [Bug 39329] - mod_dbd reconnection and prepared statements
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mkent@magoazul.com changed:
What |Removed |Added
----------------------------------------------------------------------------
Summary|mod_dbd ap_dbd_acquire |mod_dbd reconnection and
|failure |prepared statements
------- Additional Comments From mkent@magoazul.com 2007-07-06 18:33 -------
Just retested this with mod_dbd from trunk (r553563) and apr-util 1.2.7 +
current apr_dbd_mysql.c compiled against MySQL 5.0.27 and everything works as
expected with no modifications. Reconnection no longer seems to be an issue as
the need for 2 mysql_pings seems to have dissapeared, see the last couple replies in
http://bugs.mysql.com/bug.php?id=9271
but I believe for any earlier MySQL versions it will still be required.
Now the bad part is since mysql_ping in MySQL 5.0.27 (5.0.20 and later I think)
doesn't return an error anymore, just reconnects transparently, and since
prepared statements are cleared as per
http://www.mysql.org/doc/refman/5.0/en/auto-reconnect.html
I'm not sure how you can detect that a mysql_ping has done a reconnection and
reinit your prepared statements. I suppose you'd need to track the id of the
mysql connection and look for a change before and after calling apr_dbd_check_conn.
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DO NOT REPLY [Bug 39329] - mod_dbd ap_dbd_acquire failure
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------- Additional Comments From nick@webthing.com 2006-05-08 00:09 -------
Created an attachment (id=18244)
--> (http://issues.apache.org/bugzilla/attachment.cgi?id=18244&action=view)
Patch to retry a problem connection
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DO NOT REPLY [Bug 39329] - mod_dbd ap_dbd_acquire failure
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------- Additional Comments From rpluem@apache.org 2006-04-18 21:03 -------
(In reply to comment #2)
>
> I think I'd be happy with a variant on the patch that keeps a count and bails
> out explicitly if things get silly. Anyone else?
Sounds reasonable to me. What about about the maximum number of entries in the
resource list as upper limit for the counter?
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DO NOT REPLY [Bug 39329] - mod_dbd ap_dbd_acquire failure
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------- Additional Comments From mkent@magoazul.com 2006-05-18 18:18 -------
Created an attachment (id=18318)
--> (http://issues.apache.org/bugzilla/attachment.cgi?id=18318&action=view)
now with two connection checks
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nick@webthing.com changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |PatchAvailable
------- Additional Comments From nick@webthing.com 2006-05-08 00:06 -------
Just revisiting this, I hacked (In reply to comment #0)
> I'm using mod_dbd with persistant mysql connections and another custom
module to
> do vhost document root lookups against a database.
>
> The problems is that my mod_dbd connections reach the MySQL daemons
wait_timeout
> of 600 seconds and are closed automatically.
Come to think of it, I thought mysql_ping (as used in the check_conn function)
would reopen the connection if it had timed out. ISTR it doing that for me
when I tested it.
Adding a new patch (untested). Not decided whether to test and commit it.
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DO NOT REPLY [Bug 39329] - mod_dbd ap_dbd_acquire failure
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------- Additional Comments From nick@webthing.com 2006-04-18 01:34 -------
I'm not sure this is safe: the potential problem is that your while() loop
never terminates, if some backend returns SUCCESS on acquire but some other
status on check_conn. I can't think of a realistic case, but that's not the
point.
I think I'd be happy with a variant on the patch that keeps a count and bails
out explicitly if things get silly. Anyone else?
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DO NOT REPLY [Bug 39329] - mod_dbd reconnection and prepared statements
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------- Additional Comments From daniel@bestningning.com 2007-09-11 19:44 -------
Created an attachment (id=20794)
--> (http://issues.apache.org/bugzilla/attachment.cgi?id=20794&action=view)
mod_dbd.c patched to invalidate the reslist of all stale connections
The mod_dbd.c is taken from the trunk before being patched. It simply recreate
a resource if all the connection resource in a reslist fail check_conn.
Re-prepare the statement doesnt seem to completely fix the problem as
mysql_ping doesnt seem to restore the connection handle either. Re-create all
resource wont be a problem because it only happens once for every idle timeout.
this patch requires auto-reconnect to be turned off for mysql. Now it works on
all my servers.
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DO NOT REPLY [Bug 39329] - mod_dbd reconnection and prepared statements
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rpluem@apache.org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |NEEDINFO
------- Additional Comments From rpluem@apache.org 2007-09-12 11:48 -------
Please provide a patch instead of the full mod_dbd.c (see also
http://httpd.apache.org/dev/patches.html)
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------- Additional Comments From mkent@magoazul.com 2006-04-17 23:11 -------
Created an attachment (id=18116)
--> (http://issues.apache.org/bugzilla/attachment.cgi?id=18116&action=view)
patch to retry for a valid connection
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apache.ei@kefro.st changed:
What |Removed |Added
----------------------------------------------------------------------------
Attachment #18318|0 |1
is obsolete| |
------- Additional Comments From apache.ei@kefro.st 2006-10-11 04:50 -------
Created an attachment (id=18989)
--> (http://issues.apache.org/bugzilla/attachment.cgi?id=18989&action=view)
Reprepare Statements after autoreconnect
This patch adds one line attempting to recreate prepared statements after a
reconnection. This appears to fix the issue, although more errorchecking may be
neeeded.
(Patch is working nicely on 2.2.3).
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chetanreddy@gmail.com changed:
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CC| |chetanreddy@gmail.com
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poeml@suse.de changed:
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------- Additional Comments From nick@webthing.com 2006-04-18 22:05 -------
DBDKeep is surely a maximum. The problem in question isn't going to apply to
servers around peak load.
The implication of looping would seem to be tearing down and opening lots of
connections all at once - could be a Bad Thing. IMHO A better fix - which
alas can't be easily retrofitted - would be to return an EAGAIN status and
leave the application to retry.
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