OAK-5465 - Remove the useless cache in StandbyClientSyncExecution

The segments loaded by StandbyClientSyncExecution are guaranteed not to already
exist locally and are processed only once. The cache is useless and can be
removed.


git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1779175 13f79535-47bb-0310-9956-ffa450edef68

oak-segment-tar/src/main/java/org/apache/jackrabbit/oak/segment/standby/client/StandbyClientSyncExecution.java

@@ -17,19 +17,15 @@
 
 package org.apache.jackrabbit.oak.segment.standby.client;
 
-import static com.google.common.collect.Maps.newHashMap;
-
 import java.util.HashSet;
 import java.util.LinkedList;
-import java.util.Map;
 import java.util.Set;
 import java.util.UUID;
 
 import javax.annotation.Nullable;
 
 import com.google.common.base.Supplier;
 import org.apache.jackrabbit.oak.segment.RecordId;
-import org.apache.jackrabbit.oak.segment.Segment;
 import org.apache.jackrabbit.oak.segment.SegmentId;
 import org.apache.jackrabbit.oak.segment.SegmentNodeBuilder;
 import org.apache.jackrabbit.oak.segment.SegmentNodeState;
@@ -54,8 +50,6 @@ class StandbyClientSyncExecution {
 
     private final Supplier<Boolean> running;
 
-    private final Map<UUID, Segment> cache = newHashMap();
-
     StandbyClientSyncExecution(FileStore store, StandbyClient client, Supplier<Boolean> running) {
         this.store = store;
         this.client = client;
@@ -218,13 +212,6 @@ private boolean isLocal(UUID id) {
     }
 
     private void copySegmentFromPrimary(UUID uuid) throws Exception {
-        Segment result = cache.get(uuid);
-
-        if (result != null) {
-            log.debug("Segment {} was found in the local cache", uuid);
-            return;
-        }
-
         byte[] data = client.getSegment(uuid.toString());
 
         if (data == null) {
@@ -235,8 +222,6 @@ private void copySegmentFromPrimary(UUID uuid) throws Exception {
         long lsb = uuid.getLeastSignificantBits();
         SegmentId segmentId = store.newSegmentId(msb, lsb);
         store.writeSegment(segmentId, data, 0, data.length);
-        result = segmentId.getSegment();
-        cache.put(uuid, result);
     }
 
 }