I think you could try:
IndexWriter writer = new IndexWriter(fileDirectory, ...)
writer.addIndexes(ramDir)
-Grant
On Mar 20, 2008, at 2:47 PM, roger dimitri wrote:
Hi,
I am using the Directory class's copy method to periodically sync
my RAM based index to a file based index that's supposed to serve as
a hot backup. I want to know if this is the right way to maintain a
periodic backup of my RAM based index and, if Yes, then is it
reliable in a production instance with almost 12 to 15 GB of Lucene
index loaded into the RAMDirectory.
Any advice is greatly appreciated.
I have a sample working code snippet here:
public class RAMtoFILEcopy_test1 {
static String[] queries = {
"a OR b AND c",
"(a OR b) AND c",
"a OR (b AND c)",
"a AND b",
"a AND b OR c AND d",
"(a AND b) OR (c AND d)",
"a AND (b OR c) AND d",
"((a AND b) OR c) AND d",
"a AND (b OR (c AND d))",
"a AND b AND c AND d",
"a OR b AND NOT c",
"(a OR b) AND NOT c",
"a OR (b AND NOT c)",
"a AND NOT d",
"a AND NOT b OR c AND NOT d",
"(a AND NOT b) OR (c AND NOT d)",
"a AND NOT (b OR c) AND NOT d",
"((a AND NOT b) OR c) AND NOT d",
"a AND NOT (b OR (c AND NOT d))",
"a AND NOT b AND NOT c AND NOT d",
"a OR NOT b",
"a OR NOT a",
"a b",
"a b c",
"a b (c d e)",
"+a +b",
"a -b",
"a +b -c",
"+a b -c",
"+a -b c",
"a -b -c",
"-a b c",
"a OR b c AND d",
"a OR b c",
"a AND b c",
"a OR b c OR d",
"a OR b c d OR e",
"a AND b c AND d",
"a AND b c d AND e"
};
public static void main(String argv[]) throws Exception {
Directory dir = new RAMDirectory();
Analyzer analyzer = new StandardAnalyzer();
IndexWriter writer = new IndexWriter(dir, analyzer, true);
for ( int i=0; i < queries.length; i++ ) {
Document doc = new Document();
doc.add(new Field("text", queries[i], Field.Store.YES,
Field.Index.TOKENIZED));
writer.addDocument(doc);
}
writer.close();
Directory dir2 = FSDirectory.getDirectory("/tmp/
TestHotbackup", true);
dir.copy(dir, dir2, true);
}
}
Thanks a lot,
Roger
____________________________________________________________________________________
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--------------------------
Grant Ingersoll
http://www.lucenebootcamp.com
Next Training: April 7, 2008 at ApacheCon Europe in Amsterdam
Lucene Helpful Hints:
http://wiki.apache.org/lucene-java/BasicsOfPerformance
http://wiki.apache.org/lucene-java/LuceneFAQ
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