Folks,
I am trying to get Lucene MMAP to work in solr.
I am assuming that when I configure MMAP the entire index will be loaded
into RAM.
Is that the right assumption ?
I have tried the following ways for using MMAP:
Option 1. Using the solr config below for MMAP configuration
-Dorg.apache.lucene.FSDirectory.class=org.apache.lucene.store.MMapDirectory
With this config, when I start solr with a 30G index, I expected that the
RAM usage should go up, but it did not.
Option 2. By Code Change
I made the following code change :
Changed org.apache.solr.core.StandardDirectoryFactory to use MMAP instead
of FSDirectory.
Code snippet pasted below.
Could you help me to understand if these are the right way to use MMAP?
Thanks much
/ST.
Code SNippet for Option 2:
package org.apache.solr.core;
/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import java.io.File;
import java.io.IOException;
import org.apache.lucene.store.Directory;
import org.apache.lucene.store.MMapDirectory;
/**
* Directory provider which mimics original Solr FSDirectory based behavior.
*
*/
public class StandardDirectoryFactory extends DirectoryFactory {
public Directory open(String path) throws IOException {
return MMapDirectory.open(new File(path));
}
}
