diff --git a/asterixdb/asterix-common/src/main/java/org/apache/asterix/common/context/FileMapManager.java b/asterixdb/asterix-common/src/main/java/org/apache/asterix/common/context/FileMapManager.java
index c492661..c4a294d 100644
--- a/asterixdb/asterix-common/src/main/java/org/apache/asterix/common/context/FileMapManager.java
+++ b/asterixdb/asterix-common/src/main/java/org/apache/asterix/common/context/FileMapManager.java
@@ -82,15 +82,4 @@
         name2IdMap.put(fileName, fileId);
     }
 
-    @Override
-    public int registerMemoryFile() {
-        Integer fileId = idCounter++;
-        id2nameMap.put(fileId, null);
-        return fileId;
-    }
-
-    @Override
-    public void unregisterMemFile(int fileId) throws HyracksDataException {
-        id2nameMap.remove(fileId);
-    }
 }
diff --git a/hyracks-fullstack/hyracks/hyracks-storage-am-lsm-common/src/main/java/org/apache/hyracks/storage/am/lsm/common/impls/MultitenantVirtualBufferCache.java b/hyracks-fullstack/hyracks/hyracks-storage-am-lsm-common/src/main/java/org/apache/hyracks/storage/am/lsm/common/impls/MultitenantVirtualBufferCache.java
index 3ef419e..6878fcf 100644
--- a/hyracks-fullstack/hyracks/hyracks-storage-am-lsm-common/src/main/java/org/apache/hyracks/storage/am/lsm/common/impls/MultitenantVirtualBufferCache.java
+++ b/hyracks-fullstack/hyracks/hyracks-storage-am-lsm-common/src/main/java/org/apache/hyracks/storage/am/lsm/common/impls/MultitenantVirtualBufferCache.java
@@ -131,17 +131,6 @@
         return vbc.getFileMapProvider();
     }
 
-    //These 4 methods are not applicable here
-    @Override
-    public int createMemFile() throws HyracksDataException {
-        throw new UnsupportedOperationException("Virtual Pages are not a valid concept in this context");
-    }
-
-    @Override
-    public void deleteMemFile(int fileId) throws HyracksDataException {
-        throw new UnsupportedOperationException("Virtual Pages are not a valid concept in this context");
-    }
-
     @Override
     public int getNumPagesOfFile(int fileId) throws HyracksDataException {
         throw new UnsupportedOperationException();
@@ -182,11 +171,6 @@
     }
 
     @Override
-    public void copyPage(ICachedPage src, ICachedPage dst) {
-
-    }
-
-    @Override
     public void setPageDiskId(ICachedPage page, long dpid) {
 
     }
diff --git a/hyracks-fullstack/hyracks/hyracks-storage-am-lsm-common/src/main/java/org/apache/hyracks/storage/am/lsm/common/impls/VirtualBufferCache.java b/hyracks-fullstack/hyracks/hyracks-storage-am-lsm-common/src/main/java/org/apache/hyracks/storage/am/lsm/common/impls/VirtualBufferCache.java
index 49f9060..fce0b74 100644
--- a/hyracks-fullstack/hyracks/hyracks-storage-am-lsm-common/src/main/java/org/apache/hyracks/storage/am/lsm/common/impls/VirtualBufferCache.java
+++ b/hyracks-fullstack/hyracks/hyracks-storage-am-lsm-common/src/main/java/org/apache/hyracks/storage/am/lsm/common/impls/VirtualBufferCache.java
@@ -350,16 +350,6 @@
         }
     }
 
-    //These 4 methods aren't applicable here.
-    @Override
-    public int createMemFile() throws HyracksDataException {
-        return 0;
-    }
-
-    @Override
-    public void deleteMemFile(int fileId) throws HyracksDataException {
-    }
-
     @Override
     public int getNumPagesOfFile(int fileId) throws HyracksDataException {
         synchronized (fileMapManager) {
@@ -405,11 +395,6 @@
     }
 
     @Override
-    public void copyPage(ICachedPage src, ICachedPage dst) {
-        throw new UnsupportedOperationException("Virtual buffer caches don't have FIFO writers");
-    }
-
-    @Override
     public void setPageDiskId(ICachedPage page, long dpid) {
 
     }
diff --git a/hyracks-fullstack/hyracks/hyracks-storage-common/src/main/java/org/apache/hyracks/storage/common/buffercache/BufferCache.java b/hyracks-fullstack/hyracks/hyracks-storage-common/src/main/java/org/apache/hyracks/storage/common/buffercache/BufferCache.java
index e201181..8391e5c 100644
--- a/hyracks-fullstack/hyracks/hyracks-storage-common/src/main/java/org/apache/hyracks/storage/common/buffercache/BufferCache.java
+++ b/hyracks-fullstack/hyracks/hyracks-storage-common/src/main/java/org/apache/hyracks/storage/common/buffercache/BufferCache.java
@@ -70,7 +70,6 @@
     private final IFileMapManager fileMapManager;
     private final CleanerThread cleanerThread;
     private final Map<Integer, BufferedFileHandle> fileInfoMap;
-    private final Set<Integer> virtualFiles;
     private final AsyncFIFOPageQueueManager fifoWriter;
     private final Queue<BufferCacheHeaderHelper> headerPageCache = new ConcurrentLinkedQueue<>();
 
@@ -104,7 +103,6 @@
 
         Executor executor = Executors.newCachedThreadPool(threadFactory);
         fileInfoMap = new HashMap<>();
-        virtualFiles = new HashSet<>();
         cleanerThread = new CleanerThread();
         executor.execute(cleanerThread);
         closed = false;
@@ -153,9 +151,9 @@
         synchronized (fileInfoMap) {
             fInfo = fileInfoMap.get(fileId);
         }
-        if (fInfo == null && !virtualFiles.contains(fileId)) {
+        if (fInfo == null) {
             throw new HyracksDataException("pin called on a fileId " + fileId + " that has not been created.");
-        } else if (fInfo != null && fInfo.getReferenceCount() <= 0) {
+        } else if (fInfo.getReferenceCount() <= 0) {
             throw new HyracksDataException("pin called on a fileId " + fileId + " that has not been opened.");
         }
     }
@@ -802,22 +800,6 @@
     }
 
     @Override
-    public int createMemFile() throws HyracksDataException {
-        if (LOGGER.isLoggable(fileOpsLevel)) {
-            LOGGER.log(fileOpsLevel, "Creating memory file in cache: " + this);
-        }
-        int fileId;
-        synchronized (fileInfoMap) {
-            fileId = fileMapManager.registerMemoryFile();
-        }
-        synchronized (virtualFiles) {
-            virtualFiles.add(fileId);
-        }
-        return fileId;
-
-    }
-
-    @Override
     public void openFile(int fileId) throws HyracksDataException {
         if (LOGGER.isLoggable(fileOpsLevel)) {
             LOGGER.log(fileOpsLevel, "Opening file: " + fileId + " in cache: " + this);
@@ -999,20 +981,6 @@
     }
 
     @Override
-    public synchronized void deleteMemFile(int fileId) throws HyracksDataException {
-        //TODO: possible sanity chcecking here like in above?
-        if (LOGGER.isLoggable(fileOpsLevel)) {
-            LOGGER.log(fileOpsLevel, "Deleting memory file: " + fileId + " in cache: " + this);
-        }
-        synchronized (virtualFiles) {
-            virtualFiles.remove(fileId);
-        }
-        synchronized (fileInfoMap) {
-            fileMapManager.unregisterMemFile(fileId);
-        }
-    }
-
-    @Override
     public void start() {
         // no op
     }
@@ -1378,13 +1346,6 @@
     }
 
     @Override
-    public void copyPage(ICachedPage src, ICachedPage dst) {
-        CachedPage srcCast = (CachedPage) src;
-        CachedPage dstCast = (CachedPage) dst;
-        System.arraycopy(srcCast.buffer.array(), 0, dstCast.getBuffer().array(), 0, srcCast.buffer.capacity());
-    }
-
-    @Override
     public boolean isReplicationEnabled() {
         if (ioReplicationManager != null) {
             return ioReplicationManager.isReplicationEnabled();
diff --git a/hyracks-fullstack/hyracks/hyracks-storage-common/src/main/java/org/apache/hyracks/storage/common/buffercache/DebugBufferCache.java b/hyracks-fullstack/hyracks/hyracks-storage-common/src/main/java/org/apache/hyracks/storage/common/buffercache/DebugBufferCache.java
index 6c88275..4461069 100644
--- a/hyracks-fullstack/hyracks/hyracks-storage-common/src/main/java/org/apache/hyracks/storage/common/buffercache/DebugBufferCache.java
+++ b/hyracks-fullstack/hyracks/hyracks-storage-common/src/main/java/org/apache/hyracks/storage/common/buffercache/DebugBufferCache.java
@@ -177,16 +177,6 @@
     }
 
     @Override
-    public int createMemFile() throws HyracksDataException {
-        return bufferCache.createMemFile();
-    }
-
-    @Override
-    public void deleteMemFile(int fileId) throws HyracksDataException {
-        bufferCache.deleteMemFile(fileId);
-    }
-
-    @Override
     public int getNumPagesOfFile(int fileId) throws HyracksDataException {
         return bufferCache.getNumPagesOfFile(fileId);
     }
@@ -223,12 +213,6 @@
     }
 
     @Override
-    public void copyPage(ICachedPage src, ICachedPage dst) {
-        // TODO Auto-generated method stub
-
-    }
-
-    @Override
     public void setPageDiskId(ICachedPage page, long dpid) {
         // TODO Auto-generated method stub
 
diff --git a/hyracks-fullstack/hyracks/hyracks-storage-common/src/main/java/org/apache/hyracks/storage/common/buffercache/IBufferCache.java b/hyracks-fullstack/hyracks/hyracks-storage-common/src/main/java/org/apache/hyracks/storage/common/buffercache/IBufferCache.java
index 27e7982..90273f4 100644
--- a/hyracks-fullstack/hyracks/hyracks-storage-common/src/main/java/org/apache/hyracks/storage/common/buffercache/IBufferCache.java
+++ b/hyracks-fullstack/hyracks/hyracks-storage-common/src/main/java/org/apache/hyracks/storage/common/buffercache/IBufferCache.java
@@ -30,16 +30,12 @@
 
     public void createFile(FileReference fileRef) throws HyracksDataException;
 
-    public int createMemFile() throws HyracksDataException;
-
     public void openFile(int fileId) throws HyracksDataException;
 
     public void closeFile(int fileId) throws HyracksDataException;
 
     public void deleteFile(int fileId, boolean flushDirtyPages) throws HyracksDataException;
 
-    public void deleteMemFile(int fileId) throws HyracksDataException;
-
     public ICachedPage tryPin(long dpid) throws HyracksDataException;
 
     public ICachedPage pin(long dpid, boolean newPage) throws HyracksDataException;
@@ -76,8 +72,6 @@
 
     public void finishQueue();
 
-    void copyPage(ICachedPage src, ICachedPage dst);
-
     void setPageDiskId(ICachedPage page, long dpid);
 
     public boolean isReplicationEnabled();
diff --git a/hyracks-fullstack/hyracks/hyracks-storage-common/src/main/java/org/apache/hyracks/storage/common/file/IFileMapManager.java b/hyracks-fullstack/hyracks/hyracks-storage-common/src/main/java/org/apache/hyracks/storage/common/file/IFileMapManager.java
index acb4ba2..0d81776 100644
--- a/hyracks-fullstack/hyracks/hyracks-storage-common/src/main/java/org/apache/hyracks/storage/common/file/IFileMapManager.java
+++ b/hyracks-fullstack/hyracks/hyracks-storage-common/src/main/java/org/apache/hyracks/storage/common/file/IFileMapManager.java
@@ -47,7 +47,4 @@
      */
     public void unregisterFile(int fileId) throws HyracksDataException;
 
-    public int registerMemoryFile();
-
-    public void unregisterMemFile(int fileId) throws HyracksDataException;
 }
diff --git a/hyracks-fullstack/hyracks/hyracks-storage-common/src/main/java/org/apache/hyracks/storage/common/file/TransientFileMapManager.java b/hyracks-fullstack/hyracks/hyracks-storage-common/src/main/java/org/apache/hyracks/storage/common/file/TransientFileMapManager.java
index 05ff825..66d54b1 100644
--- a/hyracks-fullstack/hyracks/hyracks-storage-common/src/main/java/org/apache/hyracks/storage/common/file/TransientFileMapManager.java
+++ b/hyracks-fullstack/hyracks/hyracks-storage-common/src/main/java/org/apache/hyracks/storage/common/file/TransientFileMapManager.java
@@ -72,15 +72,4 @@
         name2IdMap.put(fileRef, fileId);
     }
 
-    @Override
-    public int registerMemoryFile() {
-        Integer fileId = idCounter++;
-        id2nameMap.put(fileId, null);
-        return fileId;
-    }
-
-    @Override
-    public void unregisterMemFile(int fileId) throws HyracksDataException {
-        id2nameMap.remove(fileId);
-    }
 }