1:lucene中打开一个IndexWriter后就会把索引改lock住,如果强行在打开一个IndexWriter那么就会抛出:
Lock obtain timed out: NativeFSLock@D:\lucene\index\write.lock异常。
2:所以在Lucene中要记得及时关闭IndexWriter。
package com.searchtxt.lucene;
import java.io.File;
import java.io.IOException;
import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.index.IndexWriterConfig;
import org.apache.lucene.store.Directory;
import org.apache.lucene.store.FSDirectory;
import org.apache.lucene.util.Version;
import org.junit.Before;
import org.junit.Test;
import org.wltea.analyzer.lucene.IKAnalyzer;
import com.sun.org.apache.xml.internal.security.Init;
/**
* 测试lucene索引锁不能同时打开多个IndexWriter
* @author lijunqing
*
*/
public class WriteLcok {
private Directory directory;
private Analyzer analyzer;
@Before
public void Init() throws IOException{
directory = FSDirectory.open(new File("D://lucene/index"));
analyzer = new IKAnalyzer();
}
@Test
public void TestWriteLock() throws IOException{
IndexWriterConfig iwc = new IndexWriterConfig(Version.LUCENE_40, analyzer );
IndexWriter writer1 = new IndexWriter(directory, iwc);
//writer1.close();
IndexWriter writer2 = null;
try{
if(writer1.isLocked(directory)){
System.out.println("writer1已经被锁");
}
writer2 = new IndexWriter(directory, iwc);
System.out.println("第二个IndexWriter打开成功!");
}catch(IOException e){
e.printStackTrace();
System.out.println("第二个IndexWriter打开失败!");
}finally{
writer1.close();
}
}
}
1:结果会抛出异常,
同时lucene的IndexWrite中有:
public static boolean isLocked(Directory directory) throws IOException {
return directory.makeLock(WRITE_LOCK_NAME).isLocked();
}
检查索引是否已经被锁。
而unlock方法,释放当前锁:
public static void unlock(Directory directory) throws IOException {
directory.makeLock(IndexWriter.WRITE_LOCK_NAME).release();
}
不能乱用这个。
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