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Re: (ITS#7052) Spurious CSNs being recorded on syncrepl consumers.
- To: openldap-its@OpenLDAP.org
- Subject: Re: (ITS#7052) Spurious CSNs being recorded on syncrepl consumers.
- From: hyc@symas.com
- Date: Fri, 30 Sep 2011 07:33:35 GMT
- Auto-submitted: auto-generated (OpenLDAP-ITS)
cmikk@qwest.net wrote:
> Full_Name: Chris Mikkelson
> Version: 2.4.26
> OS: FreeBSD
> URL: ftp://ftp.openldap.org/incoming/
> Submission from: (NULL) (204.147.85.37)
>
>
> When the provider sends a search response with state 'delete' with no / null
> cookie, the syncrepl consumer queues an locally-generated CSN and updates its
> context CSN with that. This appears to happen only with cookie-less deletion,
> not with cookie-less modification. I have not observed a cookie-less addition,
> so I do not know if it occurs there, too.
Thanks for the report. The bug only affected Deletes, not add or modify. Fixed
in master.
> Example logs from a pure consumer (no server-id, replicating from a provider
> with server id 002):
>
> Sep 26 13:05:42 mpls-auth-02 slapd[57295]: do_syncrep2: rid=100 cookie=
> Sep 26 13:05:42 mpls-auth-02 slapd[57295]: syncrepl_entry: rid=100
> LDAP_RES_SEARCH_ENTRY(LDAP_SYNC_DELETE)
> Sep 26 13:05:42 mpls-auth-02 slapd[57295]: syncrepl_entry: rid=100 be_search
> (0)
> Sep 26 13:05:42 mpls-auth-02 slapd[57295]: syncrepl_entry: rid=100
> uid=<snip>,ou=improv,dc=qwest,dc=net
> Sep 26 13:05:42 mpls-auth-02 slapd[57295]: slap_queue_csn: queing 0x7ffffe3fa560
> 20110926130542.130924Z#000000#000#000000
> Sep 26 13:05:42 mpls-auth-02 slapd[57295]: slap_graduate_commit_csn: removing
> 0x8f58a8a90 20110926130542.130924Z#000000#000#000000
>
> This is problematic at our site because the provider cookie contains a SID 0 CSN
> from before we migrated to multimaster, and the SID 0 CSN recorded at the
> consumer renders the consumer state newer than the provider, breaking
> replication.
>
>
--
-- Howard Chu
CTO, Symas Corp. http://www.symas.com
Director, Highland Sun http://highlandsun.com/hyc/
Chief Architect, OpenLDAP http://www.openldap.org/project/