Scan: Use ConcurrentHashMap instead of HashMap, because the readerSta…

…tes is accessed by multiple threads during the entire scroll session. Closes #7499 Closes #7478
elastic · Aug 28, 2014 · 09a8e90 · 09a8e90
1 parent cba43e9
commit 09a8e90
Showing 1 changed file with 7 additions and 7 deletions.
diff --git a/src/main/java/org/elasticsearch/search/scan/ScanContext.java b/src/main/java/org/elasticsearch/search/scan/ScanContext.java
@@ -19,18 +19,18 @@
 
 package org.elasticsearch.search.scan;
 
-import com.google.common.collect.Maps;
 import org.apache.lucene.index.AtomicReaderContext;
 import org.apache.lucene.index.IndexReader;
 import org.apache.lucene.search.*;
 import org.apache.lucene.util.Bits;
 import org.elasticsearch.common.lucene.docset.AllDocIdSet;
 import org.elasticsearch.common.lucene.search.XFilteredQuery;
+import org.elasticsearch.common.util.concurrent.ConcurrentCollections;
 import org.elasticsearch.search.internal.SearchContext;
 
 import java.io.IOException;
 import java.util.ArrayList;
-import java.util.Map;
+import java.util.concurrent.ConcurrentMap;
 
 /**
  * The scan context allows to optimize readers we already processed during scanning. We do that by keeping track
@@ -39,7 +39,7 @@
  */
 public class ScanContext {
 
-    private final Map<IndexReader, ReaderState> readerStates = Maps.newHashMap();
+    private final ConcurrentMap<IndexReader, ReaderState> readerStates = ConcurrentCollections.newConcurrentMap();
 
     public void clear() {
         readerStates.clear();
@@ -58,7 +58,7 @@ public TopDocs execute(SearchContext context) throws IOException {
 
     static class ScanCollector extends Collector {
 
-        private final Map<IndexReader, ReaderState> readerStates;
+        private final ConcurrentMap<IndexReader, ReaderState> readerStates;
 
         private final int from;
 
@@ -77,7 +77,7 @@ static class ScanCollector extends Collector {
         private IndexReader currentReader;
         private ReaderState readerState;
 
-        ScanCollector(Map<IndexReader, ReaderState> readerStates, int from, int size, boolean trackScores) {
+        ScanCollector(ConcurrentMap<IndexReader, ReaderState> readerStates, int from, int size, boolean trackScores) {
             this.readerStates = readerStates;
             this.from = from;
             this.to = from + size;
@@ -142,11 +142,11 @@ public Throwable fillInStackTrace() {
 
     public static class ScanFilter extends Filter {
 
-        private final Map<IndexReader, ReaderState> readerStates;
+        private final ConcurrentMap<IndexReader, ReaderState> readerStates;
 
         private final ScanCollector scanCollector;
 
-        public ScanFilter(Map<IndexReader, ReaderState> readerStates, ScanCollector scanCollector) {
+        public ScanFilter(ConcurrentMap<IndexReader, ReaderState> readerStates, ScanCollector scanCollector) {
             this.readerStates = readerStates;
             this.scanCollector = scanCollector;
         }