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From Amin Mohammed-Coleman <>
Subject Lucene directory copy - master copy to local index
Date Sat, 20 Jun 2009 17:32:18 GMT
I am prototyping the following situation:

1) Multiple nodes in a cluster
2) Each node has a local index
3) Search requests are maded against the local index
4) Index updates are sent to a JMS where a master process adds document to
5) Each node is configured to check whether the local index is out of date
and needs to copy from master index.

I have created a class that will be configured (quartz job) to copy master
directory files to the local directory.  I was wondering if I could get
advice on whether this is the best way to copy master directory changes to
the local.

public class LocalIndexProvider {

 private Directory masterDirectory;

private Directory localDirectory;

private final Logger LOGGER = Logger.getLogger(getClass());

 public LocalIndexProvider(Directory masterDirectory, Directory
localDirectory) {

this.masterDirectory  = masterDirectory;

this.localDirectory = localDirectory;


 public void updateLocalIndex() throws Exception {

StopWatch stopWatch = new StopWatch("copy-time");


String[] masterFiles = masterDirectory.list();

String[] localFiles = localDirectory.list();

Lock lock = localDirectory.getLockFactory().makeLock("test");


try {

if (localFiles.length != masterFiles.length) {

Directory.copy(masterDirectory, localDirectory, false);


}finally {




LOGGER.debug("total time taken :" + stopWatch.getTotalTimeMillis());



The above is just a proof of concept and I am open to any comments about it.
 It may be inefficient or it may be.  I have looked at the source code from
hibernate search and it seems as though they copy each file from the
directory (master to local).  I'm not sure whether this is something I need
to do or the above (with more refinement) would be enough.

Any help would be highly appreciated.


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