Problem using BDB replication in OpenLDAP

> Software version:
> Berkeley DB: 4.5.20
> OpenLDAP:2.3.30
>
> We want to configure the replication management in OpenLDAP's backend
> database. All write requests in OpenLDAP master site will spread to
> OpenLDAP client site for we have configured the backend database
> replication.
>
> We mend the source code the OpenLDAP according to the rep_mgr example
> provide by
>
> Berkeley DB.
>
> A test case is executed as follow:
>
> step 1: start openldap server site and client site;
> step 2: send write requests to the master site;
> step 3: search the master site and ensure the records are inserted in
> backend; database successfully;
>
> step 4: search the client site, but not ldap entry is displayed;
> step 5: kill the client site process and reboot it;
> step 5: search the client site right now after it reboot;
>
> Result: After step 5(reboot the client site), the search results from
> client site
> is same as the master site.
>
> At step 4: If we intend to insert an entry into the openLDAP server with
> BDB client configuration via ldapadd command, it will return "the entry
> already exists". After the failed insert operation, if search operation
> is executed, one entry will be displayed.Once a insert operation is
> tried, the number of entries in the subsequent search will increase by 1.
>
>
>
> My question:
>
> Why we can not search any info during the client is normally running? But
> once I rebooted the client site, it worked well and could accept search
> requests? How to solve this problem:)