(ITS#9029) MDB_MAP_FULL error after removing some records from DB
by adubovkin＠linkedin.com
Full_Name: Alex
Version: LMDB 0.9.23
OS: iOS
URL: https://hastebin.com/raw/arexecefew
Submission from: (NULL) (2620:119:5001:3000:242c:3bea:acec:6a7d)
Hey guys,
We are using LMDB in our LRUCache implementation and facing the issue: when we
evict old records from this cache sometimes we have MDB_MAP_FULL error though
record eviction by using mdb_del() went fine. We were able to isolate an issue
in the unit test which is run from just one thread. Since there are no any
concurrent readers for this case we are expecting LMDB to claim free pages
immediately after we commit "deletion" transaction, but in some rare cases it
still raises MDB_MAP_FULL error.
The unit test scenario is as follows:
1) start with empty DB
2) keep inserting random records until hi the first MDB_FULL
3) delete some old recrods to some pages
4) try to insert new record and check that is succeeded.
The step 4 fails with another MDB_FULL error
We enable debugging and attached a debug logs from LDMB. Hope it would be
helpful.
3 years, 9 months
(ITS#9028) Not able to add 'syncprov' module
by danybensighar＠gmail.com
Full_Name: Dany Bensighar
Version: 2.4.44
OS: Red Hat Enterprise Linux Server release 7.6 (Maipo)
URL: ftp://ftp.openldap.org/incoming/
Submission from: (NULL) (212.138.78.4)
Hello,
Iam setting up a master slave openldap configuration in rhel 7, while adding the
syncprov module I am getting the below error. I have checked openspaces and
special characters but nothing found
Please find the syncprov.ldif file
dn: olcOverlay=syncprov,olcDatabase={2}hdb,cn=config
objectClass: olcOverlayConfig
objectClass: olcSyncProvConfig
olcOverlay: syncprov
olcSpSessionLog: 100
Please find the error
ldapadd -Y EXTERNAL -H ldapi:/// -f syncprov.ldif
SASL/EXTERNAL authentication started
SASL username: gidNumber=1001+uidNumber=1001,cn=peercred,cn=external,cn=auth
SASL SSF: 0
adding new entry "olcOverlay=syncprov,olcDatabase={2}hdb,cn=config"
ldap_add: Invalid syntax (21)
additional info: objectClass: value #1 invalid per syntax
Your support will be highly appreciated
3 years, 9 months
Re: (ITS#9027) LMDB: API to retrieve map address
by nic＠nicwatson.org
--000000000000856dab058992e756
Content-Type: text/plain; charset="UTF-8"
The short answer is yes. Our mappings are now bigger than 1TiB (out of 2TiB
total available). Also, it *seems* to be that it is just way faster for
Linux to map things in order all at once. Additionally, we have some boxes
that still have spinning disks, and sequential access is a couple orders of
magnitude faster on those.
I haven't looked at the logic in the Linux pager, but it seems to be fairly
aggressive about taking memory pages back from large memory maps, even
though it doesn't strictly need to. Locking the memory is a bit of a
sledgehammer, but in our experience it is an effective one.
On Thu, May 23, 2019 at 2:23 PM Howard Chu <hyc(a)symas.com> wrote:
> github(a)nicwatson.org wrote:
> > Full_Name: Nic Watson
> > Version:
> > OS: Linux
> > URL: ftp://ftp.openldap.org/incoming/
> > Submission from: (NULL) (73.132.68.128)
> >
> >
> > Goal:
> > I'd like a clean way to get at the address of the data memory map in
> LMDB.
> >
> > MDB_envinfo.me_mapaddr only returns the map address if MAP_FIXED is used.
> >
> > Current Workarounds:
> > * Use OS-specific mechanism to retrieve all memory maps (e.g.
> > /proc/<pid>/smaps).
> > * Defeat opaque handle and reach into the MDB_env struct directly and
> grab the
> > me_map field.
> >
> > Justification:
> > In my current application, I notice a significant performance increase
> if I
> > mlock the mapfile. In order to do that cleanly, I need the address of
> the map.
>
> That sounds odd. Is there a lot of memory pressure from other processes on
> the machine?
> Where is the performance loss or gain coming from?
>
> --
> -- Howard Chu
> CTO, Symas Corp. http://www.symas.com
> Director, Highland Sun http://highlandsun.com/hyc/
> Chief Architect, OpenLDAP http://www.openldap.org/project/
>
--000000000000856dab058992e756
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
<div dir=3D"ltr">The short answer is yes. Our mappings are now bigger than =
1TiB (out of 2TiB total available). Also, it *seems* to be that it is just =
way faster for Linux to map things in order all at once. Additionally, we h=
ave some boxes that still have spinning disks, and sequential access is a c=
ouple orders of magnitude faster on those.<div><br></div><div>I haven't=
looked at the logic in the Linux pager, but it seems to be fairly aggressi=
ve about taking memory pages back from large memory maps, even though it do=
esn't strictly need to. Locking the memory is a bit of a sledgehammer, =
but in our experience it is an effective one.</div></div><br><div class=3D"=
gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Thu, May 23, 2019 at =
2:23 PM Howard Chu <<a href=3D"mailto:hyc@symas.com">hyc(a)symas.com</a>&g=
t; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0p=
x 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><a hre=
f=3D"mailto:github@nicwatson.org" target=3D"_blank">github(a)nicwatson.org</a=
> wrote:<br>
> Full_Name: Nic Watson<br>
> Version: <br>
> OS: Linux<br>
> URL: <a href=3D"ftp://ftp.openldap.org/incoming/" rel=3D"noreferrer" t=
arget=3D"_blank">ftp://ftp.openldap.org/incoming/</a><br>
> Submission from: (NULL) (73.132.68.128)<br>
> <br>
> <br>
> Goal:<br>
> I'd like a clean way to get at the address of the data memory map =
in LMDB.<br>
> <br>
> MDB_envinfo.me_mapaddr only returns the map address if MAP_FIXED is us=
ed.<br>
> <br>
> Current Workarounds:<br>
> * Use OS-specific mechanism to retrieve all memory maps (e.g.<br>
> /proc/<pid>/smaps). <br>
> * Defeat opaque handle and reach into the MDB_env struct directly and =
grab the<br>
> me_map field.<br>
> <br>
> Justification:<br>
> In my current application, I notice a significant performance increase=
if I<br>
> mlock the mapfile.=C2=A0 In order to do that cleanly, I need the addre=
ss of the map.<br>
<br>
That sounds odd. Is there a lot of memory pressure from other processes on =
the machine?<br>
Where is the performance loss or gain coming from?<br>
<br>
-- <br>
=C2=A0 -- Howard Chu<br>
=C2=A0 CTO, Symas Corp.=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<a href=3D"=
http://www.symas.com" rel=3D"noreferrer" target=3D"_blank">http://www.symas=
.com</a><br>
=C2=A0 Director, Highland Sun=C2=A0 =C2=A0 =C2=A0<a href=3D"http://highland=
sun.com/hyc/" rel=3D"noreferrer" target=3D"_blank">http://highlandsun.com/h=
yc/</a><br>
=C2=A0 Chief Architect, OpenLDAP=C2=A0 <a href=3D"http://www.openldap.org/p=
roject/" rel=3D"noreferrer" target=3D"_blank">http://www.openldap.org/proje=
ct/</a><br>
</blockquote></div>
--000000000000856dab058992e756--
3 years, 10 months
Re: (ITS#9027) LMDB: API to retrieve map address
by hyc＠symas.com
github(a)nicwatson.org wrote:
> Full_Name: Nic Watson
> Version:
> OS: Linux
> URL: ftp://ftp.openldap.org/incoming/
> Submission from: (NULL) (73.132.68.128)
>
>
> Goal:
> I'd like a clean way to get at the address of the data memory map in LMDB.
>
> MDB_envinfo.me_mapaddr only returns the map address if MAP_FIXED is used.
>
> Current Workarounds:
> * Use OS-specific mechanism to retrieve all memory maps (e.g.
> /proc/<pid>/smaps).
> * Defeat opaque handle and reach into the MDB_env struct directly and grab the
> me_map field.
>
> Justification:
> In my current application, I notice a significant performance increase if I
> mlock the mapfile. In order to do that cleanly, I need the address of the map.
That sounds odd. Is there a lot of memory pressure from other processes on the machine?
Where is the performance loss or gain coming from?
--
-- Howard Chu
CTO, Symas Corp. http://www.symas.com
Director, Highland Sun http://highlandsun.com/hyc/
Chief Architect, OpenLDAP http://www.openldap.org/project/
3 years, 10 months
(ITS#9027) LMDB: API to retrieve map address
by github＠nicwatson.org
Full_Name: Nic Watson
Version:
OS: Linux
URL: ftp://ftp.openldap.org/incoming/
Submission from: (NULL) (73.132.68.128)
Goal:
I'd like a clean way to get at the address of the data memory map in LMDB.
MDB_envinfo.me_mapaddr only returns the map address if MAP_FIXED is used.
Current Workarounds:
* Use OS-specific mechanism to retrieve all memory maps (e.g.
/proc/<pid>/smaps).
* Defeat opaque handle and reach into the MDB_env struct directly and grab the
me_map field.
Justification:
In my current application, I notice a significant performance increase if I
mlock the mapfile. In order to do that cleanly, I need the address of the map.
3 years, 10 months
Re: (ITS#9023) crash using ppolicy chaining from slave to master
by ondra＠mistotebe.net
On Mon, May 20, 2019 at 10:29:02AM +0000, AYANIDES, JEAN-PHILIPPE wrote:
> Yes, it serves traffic. It doesn't crash until I run a bind with a
> wrong password.
>
>> (gdb) cont
>> Continuing.
>
> [LDAP search with wrong password]
>
>> [New Thread -1237541968 (LWP 29380)]
>
>> Program exited with code 0177.
>> (gdb) thread apply all bt full
>
> Yes sorry, It runs on an old version of debian: 4:0 32 bits that I am
> not authorised to upgrade.
>
> It the first time we record that sort of issue on that platform…
Hi Jean-Philippe,
are you able to reproduce this on a different system, if not, can you
get a more recent gdb on that system?
I have tried to reproduce with a config similar to the one you describe
didn't manage to provoke a segfault with re24 nor master.
On a side note, I don't think running the chain overlay with mode=self
will work to propagate the ppolicy information the way you want. The
same failing credentials will be used to contact the upstream server and
so the initial bind will be rejected again, not allowing the
modification to be performed.
Regards,
--
Ondřej Kuzník
Senior Software Engineer
Symas Corporation http://www.symas.com
Packaged, certified, and supported LDAP solutions powered by OpenLDAP
3 years, 10 months
RE: (ITS#9023) crash using ppolicy chaining from slave to master
by jpayanides＠prosodie.com
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--_000_AM0PR0202MB35537CBC3DAD8A9A24C85FF4BA060AM0PR0202MB3553_--
3 years, 10 months
Re: (ITS#9023) crash using ppolicy chaining from slave to master
by ondra＠mistotebe.net
On Mon, May 20, 2019 at 09:44:45AM +0000, AYANIDES, JEAN-PHILIPPE wrote:
> Hello Ondřej
>
> I have proceeded like this because I had nothing more to show!
Hi Jean-Philippe,
is slapd actually willing to serve any traffic while you let gdb
continue or does it say slapd stopped immediately?
Also, while this might be a red herring, what version and architecture
of Debian do you use? There are some things about your gdb output and
library locations that I can't reconcile with any recent Debian release.
> If I run the commands as you said:
> (…)
>
> Loaded symbols for /appli/openldap-2.4.47/libexec/openldap/ppolicy-2.4.so.2
> Reading symbols from /appli/openldap-2.4.47/libexec/openldap/back_ldap-2.4.so.2...done.
> Loaded symbols for /appli/openldap-2.4.47/libexec/openldap/back_ldap-2.4.so.2
> Reading symbols from /appli/openldap-2.4.47/libexec/openldap/pw-sha2.so.0...done.
> Loaded symbols for /appli/openldap-2.4.47/libexec/openldap/pw-sha2.so.0
> Reading symbols from /appli/openldap-2.4.47/lib/libldap_r-2.4.so.2...done.
> Loaded symbols for /appli/openldap-2.4.47/lib/libldap_r-2.4.so.2
> Reading symbols from /appli/openldap-2.4.47/lib/liblber-2.4.so.2...done.
> Loaded symbols for /appli/openldap-2.4.47/lib/liblber-2.4.so.2
> Failed to read a valid object file image from memory.
> 0xb7c93183 in pthread_join () from /lib/tls/libpthread.so.0
> (gdb) set logging on
> Copying output to gdb.txt.
> (gdb) cont
> Continuing.
> [New Thread -1237541968 (LWP 29380)]
>
> Program exited with code 0177.
> (gdb) thread apply all bt full
> (gdb)
> (gdb) quit
--
Ondřej Kuzník
Senior Software Engineer
Symas Corporation http://www.symas.com
Packaged, certified, and supported LDAP solutions powered by OpenLDAP
3 years, 10 months
RE: (ITS#9023) crash using ppolicy chaining from slave to master
by jpayanides＠prosodie.com
--_000_AM0PR0202MB3553B6F7E1BAA0A82AF24A4FBA060AM0PR0202MB3553_
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3 years, 10 months
