"Unable to move index file" error during replication

[Jaco]

Hello,

While testing out the new replication features, I'm running into some
strange problem. On the slave, I keep getting an error like this after all
files have been copied from the master to the temporary index.xxxxxxxxx
directory:

SEVERE: Unable to move index file from:
D:\Data\solr\Slave\data\index.20081224110855\_21e.tvx to:
D:\Data\Solr\Slave\data\index\_21e.tvx

The replication then stops, index remains in original state, so the updates
are not available at the slave.

This is my replication config at the master:

    <requestHandler name="/replication" class="solr.ReplicationHandler" >
        <lst name="master">
            <!--Replicate on 'optimize' it can also be  'commit' -->
            <str name="replicateAfter">commit</str>
            <str name="confFiles">schema.xml</str>
        </lst>
    </requestHandler>

This is the replication config at the slave:

    <requestHandler name="/replication" class="solr.ReplicationHandler" >
        <lst name="slave">
            <str name="masterUrl">
http://hostnamemaster:8080/solr/Master/replication</str>
            <str name="pollInterval">00:10:00</str>
            <str name="zip">true</str>
        </lst>
    </requestHandler>

I'm running a Solr nightly build of 21.12.2008 in Tomcat 6 on Windows 2003.
Initially I thought there was some problem with disk space, but this is not
the case. Replication did run fine for intial version of index, but after
that at some point it didn't work anymore. Any ideas what could be wrong
here?

Thanks very much in advance, bye,

Jaco.