Commit 394d2897 authored by Pierangelo Masarati's avatar Pierangelo Masarati
Browse files

further clarify size limit related issues in sync replication (ITS#5243)

parent 5f3c0b3c
......@@ -1298,6 +1298,12 @@ is requested cannot exceed the
size limit of regular searches unless extended by the
.B prtotal
switch.
The \fBlimits\fP statement is typically used to let an unlimited
number of entries to be returned by searches performed
with the identity used by the consumer for synchronization purposes
by means of the RFC 4533 LDAP Content Synchronization protocol
(see \fBsyncrepl\fP for details).
.RE
.TP
.B maxderefdepth <depth>
......@@ -1550,7 +1556,9 @@ It is a non-negative integer having no more than three digits.
.B provider
specifies the replication provider site containing the master content
as an LDAP URI. If <port> is not given, the standard LDAP port number
(389 or 636) is used. The content of the
(389 or 636) is used.
The content of the
.B syncrepl
replica is defined using a search
specification as its result set. The consumer
......@@ -1558,16 +1566,21 @@ specification as its result set. The consumer
will send search requests to the provider
.B slapd
according to the search specification. The search specification includes
.B searchbase, scope, filter, attrs, attrsonly, sizelimit,
.BR searchbase ", " scope ", " filter ", " attrs ", " attrsonly ", " sizelimit ", "
and
.B timelimit
parameters as in the normal search specification.
The \fBscope\fP defaults to \fBsub\fP, the \fBfilter\fP defaults to
\fB(objectclass=*)\fP, and there is no default \fBsearchbase\fP. The
\fB(objectclass=*)\fP, while there is no default \fBsearchbase\fP. The
\fBattrs\fP list defaults to \fB"*,+"\fP to return all user and operational
attributes, and \fBattrsonly\fP is unset by default.
The \fBsizelimit\fP and \fBtimelimit\fP only
accept "unlimited" and positive integers, and both default to "unlimited".
The \fBsizelimit\fP parameter defines a consumer requested limitation
on the number of entries that can be returned by the search; as such,
it is intended to implement partial replication based on the size
of the replicated database.
The LDAP Content Synchronization protocol has two operation types.
In the
.B refreshOnly
......@@ -1591,10 +1604,18 @@ For example, retry="60 10 300 3" lets the consumer retry every 60 seconds
for the first 10 times and then retry every 300 seconds for the next 3
times before stop retrying. The `+' in <# of retries> means indefinite
number of retries until success.
The schema checking can be enforced at the LDAP Sync
consumer site by turning on the
.B schemachecking
parameter. The default is off.
parameter. The default is \fBoff\fP.
Schema checking \fBon\fP means that replicated entries must have
a structural objectClass, must obey to objectClass requirements
in terms of required/allowed attributes, and that naming attributes
and distinguished values must be present.
As a consequence, schema checking should be \fBoff\fP when partial
replication is used.
The
.B starttls
parameter specifies use of the StartTLS extended operation
......@@ -1603,6 +1624,7 @@ StartTLS request fails and the
.B critical
argument was used, the session will be aborted. Otherwise the syncrepl
session continues without TLS.
A
.B bindmethod
of
......@@ -1635,6 +1657,11 @@ keyword above) for a SASL bind can be set with the
option. A non default SASL realm can be set with the
.B realm
option.
The identity used for synchronization by the consumer should be allowed
to receive an unlimited number of entries in response to a search request;
this can be accomplished by either allowing unlimited \fBsizelimit\fP
or by setting an appropriate \fBlimits\fP statement in the consumer's
configuration (see \fBsizelimit\fP and \fBlimits\fP for details).
Rather than replicating whole entries, the consumer can query logs of
data modifications. This mode of operation is referred to as \fIdelta
......
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