Re: delta-syncrepl replica out of date

[Francis Swasey <Frank.Swasey@uvm.edu>]

I'm sorry I haven't gotten back to you on this before now.

I've done some testing and I need a pointer or two to see if I've got 
something wonky or a bug.

On my master server, the accesslog overlay has a contextCSN value for 
the accesslog database that has the value of when the slapd was started. 
 It doesn't contain data that far back.

Here's LDIF for the accesslog suffix:

dn: cn=accesslog
objectClass: auditContainer
cn: accesslog
entryCSN: 20070710160157Z#000000#00#000000
structuralObjectClass: auditContainer
contextCSN: 20071010225200Z#000000#00#000000

and the oldest information left in the accesslog db has an entryCSN 
value of 20071022225634Z#000000#00#000000.

First, shouldn't the accesslog db contextCSN be updated to indicate the 
oldest information still present?

Second, does the syncprov overlay look at the contextCSN of the 
accesslog db or of the main db?  My assumption is it is checking the 
accesslog db (and hence, doesn't think it needs to send a hint because 
the accesslog db contextCSN is much older than the contextCSN from the 
dc=example,dc=com I slapadded on the replica).

Third, I set up a test replica using loglevel any and I do not see any 
indication that any hint was provided.  I've never gone looking for one 
before -- so, I'm not certain what I'm looking for.  However, I see 
indication that syncrepl initialized and then started feeding in the 
updates from the accesslog on the master.  Did I miss it, is it not 
logged, or am I just blind again?

Finally, looking at the accesslog.c overlay source, I see where the 
contextCSN is set from the "main DB" during the original open.  However, 
I have not found any indication that the contextCSN is updated during 
the subsequent logpurge actions (which may have more to do with I 
haven't found the code that does the purge action yet than anything 
else).  However, given my current contextCSN in the accesslog db matches 
the last time slapd was started and the oldest data actually present is 
from just over 12 hours ago, I'm suspicious.

Thanks,

--
Frank Swasey                    | http://www.uvm.edu/~fcs
Sr Systems Administrator        | Always remember: You are UNIQUE,
University of Vermont           |    just like everyone else.
  "I am not young enough to know everything." - Oscar Wilde (1854-1900)

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