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From tillrohrmann <...@git.apache.org>
Subject [GitHub] flink pull request #4238: [FLINK-7057][blob] move BLOB ref-counting from Lib...
Date Thu, 17 Aug 2017 10:17:59 GMT
Github user tillrohrmann commented on a diff in the pull request:

    https://github.com/apache/flink/pull/4238#discussion_r133670563
  
    --- Diff: flink-runtime/src/test/java/org/apache/flink/runtime/blob/BlobCacheCleanupTest.java
---
    @@ -0,0 +1,324 @@
    +/*
    + * Licensed to the Apache Software Foundation (ASF) under one
    + * or more contributor license agreements.  See the NOTICE file
    + * distributed with this work for additional information
    + * regarding copyright ownership.  The ASF licenses this file
    + * to you under the Apache License, Version 2.0 (the
    + * "License"); you may not use this file except in compliance
    + * with the License.  You may obtain a copy of the License at
    + *
    + *     http://www.apache.org/licenses/LICENSE-2.0
    + *
    + * Unless required by applicable law or agreed to in writing, software
    + * distributed under the License is distributed on an "AS IS" BASIS,
    + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    + * See the License for the specific language governing permissions and
    + * limitations under the License.
    + */
    +
    +package org.apache.flink.runtime.blob;
    +
    +import org.apache.flink.api.common.JobID;
    +import org.apache.flink.configuration.BlobServerOptions;
    +import org.apache.flink.configuration.ConfigConstants;
    +import org.apache.flink.configuration.Configuration;
    +import org.junit.Ignore;
    +import org.junit.Rule;
    +import org.junit.Test;
    +import org.junit.rules.TemporaryFolder;
    +
    +import java.io.File;
    +import java.io.IOException;
    +import java.net.InetSocketAddress;
    +import java.util.ArrayList;
    +import java.util.Arrays;
    +import java.util.Collection;
    +import java.util.List;
    +
    +import static org.junit.Assert.assertEquals;
    +
    +/**
    + * A few tests for the deferred ref-counting based cleanup inside the {@link BlobCache}.
    + */
    +public class BlobCacheCleanupTest {
    +
    +	@Rule
    +	public TemporaryFolder temporaryFolder = new TemporaryFolder();
    +
    +	/**
    +	 * Tests that {@link BlobCache} cleans up after calling {@link BlobCache#releaseJob(JobID)}.
    +	 */
    +	@Test
    +	public void testJobCleanup() throws IOException, InterruptedException {
    +
    +		JobID jobId = new JobID();
    +		List<BlobKey> keys = new ArrayList<BlobKey>();
    +		BlobServer server = null;
    +		BlobCache cache = null;
    +
    +		final byte[] buf = new byte[128];
    +
    +		try {
    +			Configuration config = new Configuration();
    +			config.setString(BlobServerOptions.STORAGE_DIRECTORY,
    +				temporaryFolder.newFolder().getAbsolutePath());
    +			config.setLong(BlobServerOptions.CLEANUP_INTERVAL, 1L);
    +
    +			server = new BlobServer(config, new VoidBlobStore());
    +			InetSocketAddress serverAddress = new InetSocketAddress("localhost", server.getPort());
    +			BlobClient bc = new BlobClient(serverAddress, config);
    +			cache = new BlobCache(serverAddress, config, new VoidBlobStore());
    +
    +			keys.add(bc.put(jobId, buf));
    +			buf[0] += 1;
    +			keys.add(bc.put(jobId, buf));
    +
    +			bc.close();
    +
    +			checkFileCountForJob(2, jobId, server);
    +			checkFileCountForJob(0, jobId, cache);
    +
    +			// register once
    +			cache.registerJob(jobId);
    +
    +			checkFileCountForJob(2, jobId, server);
    +			checkFileCountForJob(0, jobId, cache);
    +
    +			for (BlobKey key : keys) {
    +				cache.getFile(jobId, key);
    +			}
    +
    +			// register again (let's say, from another thread or so)
    +			cache.registerJob(jobId);
    +			for (BlobKey key : keys) {
    +				cache.getFile(jobId, key);
    +			}
    +
    +			assertEquals(2, checkFilesExist(jobId, keys, cache, true));
    +			checkFileCountForJob(2, jobId, server);
    +			checkFileCountForJob(2, jobId, cache);
    +
    +			// after releasing once, nothing should change
    +			cache.releaseJob(jobId);
    +
    +			assertEquals(2, checkFilesExist(jobId, keys, cache, true));
    +			checkFileCountForJob(2, jobId, server);
    +			checkFileCountForJob(2, jobId, cache);
    +
    +			// after releasing the second time, the job is up for deferred cleanup
    +			cache.releaseJob(jobId);
    +
    +			// because we cannot guarantee that there are not thread races in the build system,
we
    +			// loop for a certain while until the references disappear
    +			{
    +				long deadline = System.currentTimeMillis() + 30_000L;
    +				do {
    +					Thread.sleep(100);
    +				}
    +				while (checkFilesExist(jobId, keys, cache, false) != 0 &&
    +					System.currentTimeMillis() < deadline);
    +			}
    +
    +			// the blob cache should no longer contain the files
    +			// this fails if we exited via a timeout
    +			checkFileCountForJob(0, jobId, cache);
    +			// server should be unaffected
    +			checkFileCountForJob(2, jobId, server);
    +		}
    +		finally {
    +			if (cache != null) {
    +				cache.close();
    +			}
    +
    +			if (server != null) {
    +				server.close();
    +			}
    +			// now everything should be cleaned up
    +			checkFileCountForJob(0, jobId, server);
    +		}
    +	}
    +
    +	/**
    +	 * Tests that {@link BlobCache} cleans up after calling {@link BlobCache#releaseJob(JobID)}
    +	 * but only after preserving the file for a bit longer.
    +	 */
    +	@Test
    +	@Ignore("manual test due to stalling: ensures a BLOB is retained first and only deleted
after the (long) timeout ")
    +	public void testJobDeferredCleanup() throws IOException, InterruptedException {
    +		// file should be deleted between 5 and 10s after last job release
    +		long cleanupInterval = 5L;
    +
    +		JobID jobId = new JobID();
    +		List<BlobKey> keys = new ArrayList<BlobKey>();
    +		BlobServer server = null;
    +		BlobCache cache = null;
    +
    +		final byte[] buf = new byte[128];
    +
    +		try {
    +			Configuration config = new Configuration();
    +			config.setString(BlobServerOptions.STORAGE_DIRECTORY,
    +				temporaryFolder.newFolder().getAbsolutePath());
    +			config.setLong(BlobServerOptions.CLEANUP_INTERVAL, cleanupInterval);
    +
    +			server = new BlobServer(config, new VoidBlobStore());
    +			InetSocketAddress serverAddress = new InetSocketAddress("localhost", server.getPort());
    +			BlobClient bc = new BlobClient(serverAddress, config);
    +			cache = new BlobCache(serverAddress, config, new VoidBlobStore());
    +
    +			keys.add(bc.put(jobId, buf));
    +			buf[0] += 1;
    +			keys.add(bc.put(jobId, buf));
    +
    +			bc.close();
    +
    +			checkFileCountForJob(2, jobId, server);
    +			checkFileCountForJob(0, jobId, cache);
    +
    +			// register once
    +			cache.registerJob(jobId);
    +
    +			checkFileCountForJob(2, jobId, server);
    +			checkFileCountForJob(0, jobId, cache);
    +
    +			for (BlobKey key : keys) {
    +				cache.getFile(jobId, key);
    +			}
    +
    +			// register again (let's say, from another thread or so)
    +			cache.registerJob(jobId);
    +			for (BlobKey key : keys) {
    +				cache.getFile(jobId, key);
    +			}
    +
    +			assertEquals(2, checkFilesExist(jobId, keys, cache, true));
    +			checkFileCountForJob(2, jobId, server);
    +			checkFileCountForJob(2, jobId, cache);
    +
    +			// after releasing once, nothing should change
    +			cache.releaseJob(jobId);
    +
    +			assertEquals(2, checkFilesExist(jobId, keys, cache, true));
    +			checkFileCountForJob(2, jobId, server);
    +			checkFileCountForJob(2, jobId, cache);
    +
    +			// after releasing the second time, the job is up for deferred cleanup
    +			cache.releaseJob(jobId);
    +
    +			// files should still be accessible for now
    +			assertEquals(2, checkFilesExist(jobId, keys, cache, true));
    +			checkFileCountForJob(2, jobId, cache);
    +
    +			Thread.sleep(cleanupInterval / 5);
    --- End diff --
    
    We could, for example, extend BlobCache to introduce synchronization hooks.


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