fixing UT failure

Change-Id: I9d76998db2d23a0151580cba7e7a95bb7eb2ff18

Author: wchevreuil

hbase-server/src/test/java/org/apache/hadoop/hbase/TestCacheEviction.java

@@ -42,6 +42,7 @@
 import org.apache.hadoop.hbase.testclassification.MiscTests;
 import org.apache.hadoop.hbase.util.Bytes;
 import org.apache.hadoop.hbase.util.Pair;
+import org.junit.Before;
 import org.junit.BeforeClass;
 import org.junit.ClassRule;
 import org.junit.Test;
@@ -66,11 +67,16 @@ public static void setUp() throws Exception {
     UTIL.getConfiguration().setInt(HConstants.HBASE_CLIENT_RETRIES_NUMBER, 2);
     UTIL.getConfiguration().setBoolean(CACHE_BLOCKS_ON_WRITE_KEY, true);
     UTIL.getConfiguration().setBoolean(PREFETCH_BLOCKS_ON_OPEN_KEY, true);
-    UTIL.getConfiguration().set(BUCKET_CACHE_IOENGINE_KEY, "offheap");
     UTIL.getConfiguration().setInt(BUCKET_CACHE_SIZE_KEY, 200);
     UTIL.getConfiguration().set(StoreFileTrackerFactory.TRACKER_IMPL, "FILE");
   }
 
+  @Before
+  public void testSetup() {
+    UTIL.getConfiguration().set(BUCKET_CACHE_IOENGINE_KEY,
+      "file:" + UTIL.getDataTestDir() + "/bucketcache");
+  }
+
   @Test
   public void testEvictOnSplit() throws Exception {
     doTestEvictOnSplit("testEvictOnSplit", true,