HBASE-22496 UnsafeAccess.unsafeCopy should not copy more than UNSAFE_COPY_THRESHOLD on each iteration

Change-Id: I259bc54a0a5b3474d3c455639c3e9cb1e95c8438

Signed-off-by: huzheng <[email protected]>

Author: wchevreuil

hbase-common/src/main/java/org/apache/hadoop/hbase/util/UnsafeAccess.java

@@ -333,7 +333,7 @@ public static void copy(byte[] src, int srcOffset, ByteBuffer dest, int destOffs
   private static void unsafeCopy(Object src, long srcAddr, Object dst, long destAddr, long len) {
     while (len > 0) {
       long size = (len > UNSAFE_COPY_THRESHOLD) ? UNSAFE_COPY_THRESHOLD : len;
-      theUnsafe.copyMemory(src, srcAddr, dst, destAddr, len);
+      theUnsafe.copyMemory(src, srcAddr, dst, destAddr, size);
       len -= size;
       srcAddr += size;
       destAddr += size;