--On Tuesday, January 30, 2018 9:04 PM +0000 quanah@openldap.org wrote:

Full_Name: Quanah Gibson-Mount Version: 2.4.45 OS: Linux URL: ftp://ftp.openldap.org/incoming/ Submission from: (NULL) (47.208.148.239)

Did the following test:

4-way MMR setup, database populated from an initial DB that has history to it

Per Howard's suggestion, I commented out lines 2390-2396 in syncprov.c, which allows the master to get fed back its own operations on startup.

On the plus side, the database indeed get all the operations sent back. There were 1187 entries in the accesslog DBs of all 4 nodes.

On the minus side, while server IDs 2,3, and 4 all agreed on the final resulting contextCSN, serverID 1 did not. Which then broke the ability for the nodes to communicate with each other (err=53)

Last entry on serverIDs 1/2/3/4:

dn: reqStart=20180130233019.000017Z,cn=accesslog objectClass: auditModify reqStart: 20180130233019.000017Z reqEnd: 20180130233019.000018Z reqType: modify reqSession: 1 reqAuthzID: cn=ldaproot,dc=xxx,dc=yyy reqDN: dc=xxx,dc=yyy reqResult: 0 reqMod: contextCSN:= 20180130233019.035885Z#000000#001#000000 reqMod: contextCSN:= 20171130222521.056018Z#000000#002#000000 reqMod: contextCSN:= 20171130222318.939265Z#000000#003#000000 reqMod: contextCSN:= 20171203041258.811473Z#000000#004#000000 reqEntryUUID: 156eb8cc-18e9-1027-80e5-d3f2010890dc

contextCSNs on 2/3/4: base contextCSN: 20180130233019.035885Z#000000#001#000000 contextCSN: 20171130222521.056018Z#000000#002#000000 contextCSN: 20171130222318.939265Z#000000#003#000000 contextCSN: 20171203041258.811473Z#000000#004#000000 accesslog contextCSN: 20180130233019.035885Z#000000#001#000000 contextCSN: 20171130222521.056018Z#000000#002#000000 contextCSN: 20171130222318.939265Z#000000#003#000000 contextCSN: 20171203041258.811473Z#000000#004#000000

contextCSNs on 1: base contextCSN: 20180130233019.035885Z#000000#001#000000 contextCSN: 20171130222521.056018Z#000000#002#000000 contextCSN: 20171130222318.939265Z#000000#003#000000 contextCSN: 20171203041258.811473Z#000000#004#000000 accesslog contextCSN: 20180130233016.137867Z#000000#001#000000 contextCSN: 20171130222521.056018Z#000000#002#000000 contextCSN: 20171130222318.939265Z#000000#003#000000 contextCSN: 20171203041258.811473Z#000000#004#000000

Note that the contextCSN is correct on the database root, but incorrect in the accesslog entry.

--Quanah

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Quanah Gibson-Mount Product Architect Symas Corporation Packaged, certified, and supported LDAP solutions powered by OpenLDAP: http://www.symas.com