@Test
	public void testOrphanBlobStore() throws Exception {
			int instances = 2;
			long cleanupInterval = 1000l;
			BlobClient blobClient = null;
			BlobStoreService blobStoreService = null;
			BlobServer[] blobServers = new BlobServer[instances];
			BlobLibraryCacheManager[] managers = new BlobLibraryCacheManager[instances];
			InetSocketAddress[] addresses = new InetSocketAddress[instances];
			Random random = new Random();

			try {
				final Configuration config = new Configuration();
				config.setString(HighAvailabilityOptions.HA_MODE, "ZOOKEEPER");
				config.setString(CoreOptions.STATE_BACKEND, "FILESYSTEM");
				config.setString(HighAvailabilityOptions.HA_STORAGE_PATH,
					temporaryFolder.getRoot().getPath() + "/tmp-data");

				blobStoreService = BlobUtils.createBlobStoreFromConfig(config);

				for (int i = 0; i < instances; i++) {
					blobServers[i] = new BlobServer(config, blobStoreService);
					addresses[i] = new InetSocketAddress("0.0.0.0", blobServers[i].getPort());
					managers[i] = new BlobLibraryCacheManager(blobServers[i], cleanupInterval);
				}

				blobClient = new BlobClient(addresses[0], config);

				byte[] blob_1 = new byte[1024];
				byte[] blob_2 = new byte[1024];

				random.nextBytes(blob_1);
				random.nextBytes(blob_2);

				BlobKey key_1 = blobClient.put(blob_1);
				BlobKey key_2 = blobClient.put(blob_2);

				List<BlobKey> orphans = new ArrayList<>();
				orphans.add(key_1);
				orphans.add(key_2);

				JobID jobOrphan = new JobID();
				managers[0].registerJob(jobOrphan, orphans, Collections.<URL>emptyList());

				assertTrue(managers[0].getFile(key_1).exists());
				assertTrue(managers[0].getFile(key_2).exists());

				assertTrue(managers[1].getFile(key_1).exists());
				assertTrue(managers[1].getFile(key_2).exists());

				// server restarted and manager recovered to another server
				blobServers[0] = new BlobServer(config, blobStoreService);
				managers[0] = new BlobLibraryCacheManager(blobServers[1], cleanupInterval);

				byte[] blob_3 = new byte[1024];

				random.nextBytes(blob_3);

				BlobKey key_3 = blobClient.put(blob_3);

				List<BlobKey> blobs = new ArrayList<>();
				blobs.add(key_3);

				JobID job = new JobID();
				managers[0].registerJob(job, blobs, Collections.<URL>emptyList());

				assertTrue(managers[0].getFile(key_1).exists());
				assertTrue(managers[0].getNumberOfReferencesByKey(key_1) == 0);

				assertTrue(managers[0].getFile(key_2).exists());
				assertTrue(managers[0].getNumberOfReferencesByKey(key_2) == 0);

				assertTrue(managers[0].getFile(key_3).exists());
				assertTrue(managers[0].getNumberOfReferencesByKey(key_3) == 1);

				managers[0].unregisterJob(jobOrphan);
				managers[0].unregisterJob(job);

				// Cleaning up
				Thread.sleep(cleanupInterval + 1);

				// Checking orphan references
				//----------------------------------------------------------------------
				assertTrue(managers[0].getNumberOfReferencesByKey(key_1) == 0);
				assertTrue(managers[0].getFile(key_1).exists());

				assertTrue(managers[0].getNumberOfReferencesByKey(key_2) == 0);
				assertTrue(managers[0].getFile(key_2).exists());
				//----------------------------------------------------------------------

				int fileNotFound = 0;
				try {
					assertTrue(managers[0].getNumberOfReferencesByKey(key_3) == 0);
					managers[0].getFile(key_3).exists();
				} catch (IOException ex) {
					fileNotFound++;
				}

				// File not found, was removed correctly by cleanup
				assertEquals(1, fileNotFound);

				// Checking files after cleanup. This files should be re-register
				assertTrue(managers[0].getFile(key_1).exists());
				assertTrue(managers[0].getFile(key_2).exists());

			} finally {
				if (blobClient != null && !blobClient.isClosed()) {
					blobClient.close();
				}

				for (BlobServer bs : blobServers) {
					if (bs != null && !bs.isShutdown()) {
						bs.close();
					}
				}

				for (BlobLibraryCacheManager blcm : managers) {
					if (blcm != null) {
						blcm.shutdown();
					}
				}

				if (blobStoreService != null) {
					blobStoreService.closeAndCleanupAllData();
				}
			}
	}