diff -r 5e3970ccd86a -r 1a101ac9ea46 core/src/luan/modules/RpcLuan.java
--- a/core/src/luan/modules/RpcLuan.java	Fri Jul 15 17:35:50 2016 -0600
+++ b/core/src/luan/modules/RpcLuan.java	Sun Jul 17 19:21:52 2016 -0600
@@ -5,6 +5,7 @@
 import java.io.BufferedInputStream;
 import java.io.BufferedOutputStream;
 import java.io.InputStreamReader;
+import java.io.FilterInputStream;
 import java.io.IOException;
 import java.io.EOFException;
 import java.net.Socket;
@@ -76,12 +77,13 @@
 			} catch(LuanException e) {
 				writeBoolean(out,false);
 				writeString(out,e.getFullMessage());
+				out.flush();
 				return;
 			}
 			writeBoolean(out,true);
 			writeObjs(out,luan,rtn);
+			out.flush();
 		} finally {
-			out.flush();
 			socket.close();
 		}
 	}
@@ -267,12 +269,12 @@
 			if(this.close)  close.b = false;
 		}
 
-		private void close() throws IOException {
-			if(close)  in.close();
-		}
-
 		@Override public InputStream inputStream() {
-			return in;
+			return new FilterInputStream(in) {
+				@Override public void close() throws IOException {
+					if(close)  super.close();
+				}
+			};
 		}
 
 		@Override public String to_string() {
@@ -283,18 +285,6 @@
 			throw new UnsupportedOperationException();
 		}
 
-		@Override public String read_text() throws IOException {
-			String rtn = Utils.readAll(new InputStreamReader(in));
-			close();
-			return rtn;
-		}
-
-		@Override public byte[] read_binary() throws IOException {
-			byte[] rtn = Utils.readAll(in);
-			close();
-			return rtn;
-		}
-
 		@Override public boolean exists() {
 			return true;
 		}

diff -r 5e3970ccd86a -r 1a101ac9ea46 core/src/luan/modules/host/restore.luan
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/core/src/luan/modules/host/restore.luan	Sun Jul 17 19:21:52 2016 -0600
@@ -0,0 +1,19 @@
+local Luan = require "luan:Luan.luan"
+local error = Luan.error
+local Io = require "luan:Io.luan"
+local print = Io.print or error()
+local uri = Io.uri or error()
+local Hosting = require "luan:host/Hosting.luan"
+
+if #{...} ~= 2 then
+	Io.stderr.write "usage: luan luan:host/restore.luan domain password\n"
+	return
+end
+
+local domain, password = ...
+
+local zip_file = uri("file:backup.zip")
+zip_file.exists() or error "backup.zip not found"
+Hosting.caller(domain).lucene_restore(password,zip_file)
+
+print("restored lucene from backup.zip to "..domain)

diff -r 5e3970ccd86a -r 1a101ac9ea46 lucene/src/luan/modules/lucene/Lucene.luan
--- a/lucene/src/luan/modules/lucene/Lucene.luan	Fri Jul 15 17:35:50 2016 -0600
+++ b/lucene/src/luan/modules/lucene/Lucene.luan	Sun Jul 17 19:21:52 2016 -0600
@@ -9,6 +9,8 @@
 local String = require "luan:String.luan"
 local matches = String.matches or error()
 local Rpc = require "luan:Rpc.luan"
+local Thread = require "luan:Thread.luan"
+local synchronized = Thread.synchronized or error()
 local LuceneIndex = require "java:luan.modules.lucene.LuceneIndex"
 local NumberFieldParser = require "java:luan.modules.lucene.queryparser.NumberFieldParser"
 local StringFieldParser = require "java:luan.modules.lucene.queryparser.StringFieldParser"
@@ -113,7 +115,23 @@
 		end )
 	end
 
+	function index.restore(zip_file)
+		local lucene_dir = uri("file:"..index.dir)
+		local before_restore = lucene_dir.parent().child("before_restore.zip")
+		index.zip(before_restore)
+		java_index.close()
+		lucene_dir.delete()
+		zip_file.unzip(lucene_dir.parent().to_string())
+		java_index.reopen()
+	end
+	index.restore = synchronized(index.restore)
+
+	local function multi_error()
+		error "multiple lucene instances"
+	end
+
 	if Rpc.functions.backup == nil then
+
 		function Rpc.functions.lucene_backup(password)
 			if Io.password ~= password then
 				error "wrong password"
@@ -122,10 +140,17 @@
 			index.zip(zip_file)
 			return zip_file
 		end
+
+		function Rpc.functions.lucene_restore(password,zip_file)
+			if Io.password ~= password then
+				error "wrong password"
+			end
+			index.restore(zip_file)
+		end
+
 	else
-		function Rpc.functions.lucene_backup()
-			error "multiple lucene instance"
-		end
+		Rpc.functions.lucene_backup = multi_error
+		Rpc.functions.lucene_restore = multi_error
 	end
 
 	return index

diff -r 5e3970ccd86a -r 1a101ac9ea46 lucene/src/luan/modules/lucene/LuceneIndex.java
--- a/lucene/src/luan/modules/lucene/LuceneIndex.java	Fri Jul 15 17:35:50 2016 -0600
+++ b/lucene/src/luan/modules/lucene/LuceneIndex.java	Sun Jul 17 19:21:52 2016 -0600
@@ -83,20 +83,21 @@
 	private static final String FLD_NEXT_ID = "nextId";
 	public static final StringFieldParser STRING_FIELD_PARSER = new StringFieldParser(new KeywordAnalyzer());
 
+	private static final Version version = Version.LUCENE_4_9;
 	private final ReentrantLock writeLock = new ReentrantLock();
 	private final File indexDir;
-	final SnapshotDeletionPolicy snapshotDeletionPolicy;
-	private final IndexWriter writer;
+	private SnapshotDeletionPolicy snapshotDeletionPolicy;
+	private IndexWriter writer;
 	private DirectoryReader reader;
 	private IndexSearcher searcher;
 	private final ThreadLocal<IndexSearcher> threadLocalSearcher = new ThreadLocal<IndexSearcher>();
-	private boolean isClosed = false;
+	private boolean isClosed = true;
 	private final MultiFieldParser mfp;
 	public final LuanTable indexed_only_fields = new LuanTable();
 	private final Analyzer analyzer;
 
 	private static ConcurrentMap<File,AtomicInteger> globalWriteCounters = new ConcurrentHashMap<File,AtomicInteger>();
-	private final File fileDir;
+	private File fileDir;
 	private int writeCount;
 
 	public LuceneIndex(LuanState luan,String indexDirStr,FieldParser defaultFieldParser,String[] defaultFields) throws LuanException, IOException {
@@ -105,23 +106,28 @@
 		mfp.fields.put( "id", NumberFieldParser.LONG );
 		File indexDir = new File(indexDirStr);
 		this.indexDir = indexDir;
-		FSDirectory dir = FSDirectory.open(indexDir);
-		fileDir = dir.getDirectory();
-		globalWriteCounters.putIfAbsent(fileDir,new AtomicInteger());
-		Version version = Version.LUCENE_4_9;		
 		Analyzer analyzer = STRING_FIELD_PARSER.analyzer;
 		if( defaultFieldParser instanceof StringFieldParser ) {
 			StringFieldParser sfp = (StringFieldParser)defaultFieldParser;
 			analyzer = sfp.analyzer;
 		}
 		this.analyzer = analyzer;
+		luan.onClose(this);
+		reopen();
+	}
+
+	public void reopen() throws LuanException, IOException {
+		if( !isClosed )  throw new RuntimeException();
+		isClosed = false;
 		IndexWriterConfig conf = new IndexWriterConfig(version,analyzer);
 		snapshotDeletionPolicy = new SnapshotDeletionPolicy(conf.getIndexDeletionPolicy());
 		conf.setIndexDeletionPolicy(snapshotDeletionPolicy);
+		FSDirectory dir = FSDirectory.open(indexDir);
+		fileDir = dir.getDirectory();
+		globalWriteCounters.putIfAbsent(fileDir,new AtomicInteger());
 		writer = new IndexWriter(dir,conf);
 		writer.commit();  // commit index creation
 		reader = DirectoryReader.open(dir);
-		luan.onClose(this);
 		searcher = new IndexSearcher(reader);
 		initId();
 	}
@@ -232,29 +238,17 @@
 	}
 
 
-	private long id = 0;
-	private long idLim = 0;
+	private long id;
+	private long idLim;
 	private final int idBatch = 10;
 
 	private void initId() throws LuanException, IOException {
 		TopDocs td = searcher.search(new TermQuery(new Term("type","next_id")),1);
-/*
-		// tmp hack
-		if( td.totalHits == 0 ) {
-			td = searcher.search(new TermQuery(new Term("type index","next_id")),1);
-			if( td.totalHits == 1 ) {
-				long idLim = (Long)searcher.doc(td.scoreDocs[0].doc).getField(FLD_NEXT_ID).numericValue();
-				LuanTable doc = new LuanTable();
-				doc.rawPut( "type", "next_id" );
-				doc.rawPut( FLD_NEXT_ID, idLim );
-				writer.addDocument(toLucene(luan,doc));
-				writer.commit();
-			}
-		}
-*/
 		switch(td.totalHits) {
 		case 0:
-			break;  // do nothing
+			id = 0;
+			idLim = 0;
+			break;
 		case 1:
 			idLim = (Long)searcher.doc(td.scoreDocs[0].doc).getField(FLD_NEXT_ID).numericValue();
 			id = idLim;