HDFS-8777. Erasure Coding: add tests for taking snapshots on EC files. Contributed by Rakesh R.
Change-Id: Ia3ae582405e741ca8e90d9255ab9b95d085e5fa8
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2529464f08
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@ -189,6 +189,9 @@ Trunk (Unreleased)
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HDFS-9323. Randomize the DFSStripedOutputStreamWithFailure tests. (szetszwo)
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HDFS-8777. Erasure Coding: add tests for taking snapshots on EC files.
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(Rakesh R via zhz)
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OPTIMIZATIONS
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BUG FIXES
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@ -0,0 +1,199 @@
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/**
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.apache.hadoop.hdfs;
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import static org.junit.Assert.assertEquals;
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import static org.junit.Assert.assertNull;
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import java.io.IOException;
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import org.apache.hadoop.conf.Configuration;
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import org.apache.hadoop.fs.FsShell;
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import org.apache.hadoop.fs.Path;
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import org.apache.hadoop.fs.permission.FsPermission;
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import org.apache.hadoop.hdfs.protocol.ErasureCodingPolicy;
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import org.apache.hadoop.hdfs.protocol.HdfsConstants.SafeModeAction;
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import org.apache.hadoop.hdfs.server.namenode.ErasureCodingPolicyManager;
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import org.apache.hadoop.util.ToolRunner;
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import org.junit.After;
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import org.junit.Before;
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import org.junit.Test;
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public class TestErasureCodingPolicyWithSnapshot {
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private MiniDFSCluster cluster;
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private DistributedFileSystem fs;
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private Configuration conf;
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private final static short GROUP_SIZE = StripedFileTestUtil.NUM_DATA_BLOCKS
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+ StripedFileTestUtil.NUM_PARITY_BLOCKS;
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private final static int SUCCESS = 0;
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private final ErasureCodingPolicy sysDefaultPolicy = ErasureCodingPolicyManager
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.getSystemDefaultPolicy();
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@Before
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public void setupCluster() throws IOException {
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conf = new HdfsConfiguration();
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cluster = new MiniDFSCluster.Builder(conf).numDataNodes(GROUP_SIZE).build();
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cluster.waitActive();
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fs = cluster.getFileSystem();
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}
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@After
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public void shutdownCluster() throws IOException {
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if (cluster != null) {
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cluster.shutdown();
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}
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}
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/**
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* Test correctness of successive snapshot creation and deletion with erasure
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* coding policies. Create snapshot of ecDir's parent directory.
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*/
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@Test(timeout = 120000)
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public void testSnapshotsOnErasureCodingDirsParentDir() throws Exception {
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final int len = 1024;
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final Path ecDirParent = new Path("/parent");
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final Path ecDir = new Path(ecDirParent, "ecdir");
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final Path ecFile = new Path(ecDir, "ecfile");
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fs.mkdirs(ecDir);
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fs.allowSnapshot(ecDirParent);
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// set erasure coding policy
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fs.setErasureCodingPolicy(ecDir, sysDefaultPolicy);
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DFSTestUtil.createFile(fs, ecFile, len, (short) 1, 0xFEED);
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String contents = DFSTestUtil.readFile(fs, ecFile);
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final Path snap1 = fs.createSnapshot(ecDirParent, "snap1");
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final Path snap1ECDir = new Path(snap1, ecDir.getName());
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assertEquals("Got unexpected erasure coding policy", sysDefaultPolicy,
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fs.getErasureCodingPolicy(snap1ECDir));
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// Now delete the dir which has erasure coding policy. Re-create the dir again, and
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// take another snapshot
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fs.delete(ecDir, true);
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fs.mkdir(ecDir, FsPermission.getDirDefault());
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final Path snap2 = fs.createSnapshot(ecDirParent, "snap2");
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final Path snap2ECDir = new Path(snap2, ecDir.getName());
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assertNull("Expected null erasure coding policy",
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fs.getErasureCodingPolicy(snap2ECDir));
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// Make dir again with system default ec policy
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fs.setErasureCodingPolicy(ecDir, sysDefaultPolicy);
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final Path snap3 = fs.createSnapshot(ecDirParent, "snap3");
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final Path snap3ECDir = new Path(snap3, ecDir.getName());
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// Check that snap3's ECPolicy has the correct settings
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ErasureCodingPolicy ezSnap3 = fs.getErasureCodingPolicy(snap3ECDir);
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assertEquals("Got unexpected erasure coding policy", sysDefaultPolicy,
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ezSnap3);
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// Check that older snapshots still have the old ECPolicy settings
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assertEquals("Got unexpected erasure coding policy", sysDefaultPolicy,
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fs.getErasureCodingPolicy(snap1ECDir));
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assertEquals("Got unexpected erasure coding policy", sysDefaultPolicy,
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fs.getErasureCodingPolicy(snap2ECDir));
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// Verify contents of the snapshotted file
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final Path snapshottedECFile = new Path(snap1.toString() + "/"
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+ ecDir.getName() + "/" + ecFile.getName());
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assertEquals("Contents of snapshotted file have changed unexpectedly",
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contents, DFSTestUtil.readFile(fs, snapshottedECFile));
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// Now delete the snapshots out of order and verify the EC policy
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// correctness
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fs.deleteSnapshot(ecDirParent, snap2.getName());
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assertEquals("Got unexpected erasure coding policy", sysDefaultPolicy,
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fs.getErasureCodingPolicy(snap1ECDir));
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assertEquals("Got unexpected erasure coding policy", sysDefaultPolicy,
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fs.getErasureCodingPolicy(snap3ECDir));
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fs.deleteSnapshot(ecDirParent, snap1.getName());
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assertEquals("Got unexpected erasure coding policy", sysDefaultPolicy,
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fs.getErasureCodingPolicy(snap3ECDir));
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}
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/**
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* Test creation of snapshot on directory has erasure coding policy.
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*/
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@Test(timeout = 120000)
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public void testSnapshotsOnErasureCodingDir() throws Exception {
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final Path ecDir = new Path("/ecdir");
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fs.mkdirs(ecDir);
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fs.allowSnapshot(ecDir);
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fs.setErasureCodingPolicy(ecDir, sysDefaultPolicy);
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final Path snap1 = fs.createSnapshot(ecDir, "snap1");
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assertEquals("Got unexpected erasure coding policy", sysDefaultPolicy,
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fs.getErasureCodingPolicy(snap1));
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}
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/**
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* Test verify erasure coding policy is present after restarting the NameNode.
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*/
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@Test(timeout = 120000)
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public void testSnapshotsOnErasureCodingDirAfterNNRestart() throws Exception {
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final Path ecDir = new Path("/ecdir");
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fs.mkdirs(ecDir);
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fs.allowSnapshot(ecDir);
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// set erasure coding policy
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fs.setErasureCodingPolicy(ecDir, sysDefaultPolicy);
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final Path snap1 = fs.createSnapshot(ecDir, "snap1");
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ErasureCodingPolicy ecSnap = fs.getErasureCodingPolicy(snap1);
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assertEquals("Got unexpected erasure coding policy", sysDefaultPolicy,
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ecSnap);
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// save namespace, restart namenode, and check ec policy correctness.
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fs.setSafeMode(SafeModeAction.SAFEMODE_ENTER);
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fs.saveNamespace();
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fs.setSafeMode(SafeModeAction.SAFEMODE_LEAVE);
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cluster.restartNameNode(true);
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ErasureCodingPolicy ecSnap1 = fs.getErasureCodingPolicy(snap1);
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assertEquals("Got unexpected erasure coding policy", sysDefaultPolicy,
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ecSnap1);
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assertEquals("Got unexpected ecSchema", ecSnap.getSchema(),
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ecSnap1.getSchema());
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}
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/**
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* Test copy a snapshot will not preserve its erasure coding policy info.
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*/
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@Test(timeout = 120000)
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public void testCopySnapshotWillNotPreserveErasureCodingPolicy()
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throws Exception {
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final int len = 1024;
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final Path ecDir = new Path("/ecdir");
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final Path ecFile = new Path(ecDir, "ecFile");
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fs.mkdirs(ecDir);
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fs.allowSnapshot(ecDir);
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// set erasure coding policy
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fs.setErasureCodingPolicy(ecDir, sysDefaultPolicy);
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DFSTestUtil.createFile(fs, ecFile, len, (short) 1, 0xFEED);
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final Path snap1 = fs.createSnapshot(ecDir, "snap1");
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Path snap1Copy = new Path(ecDir.toString() + "-copy");
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final Path snap1CopyECDir = new Path("/ecdir-copy");
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String[] argv = new String[] { "-cp", "-px", snap1.toUri().toString(),
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snap1Copy.toUri().toString() };
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int ret = ToolRunner.run(new FsShell(conf), argv);
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assertEquals("cp -px is not working on a snapshot", SUCCESS, ret);
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assertNull("Got unexpected erasure coding policy",
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fs.getErasureCodingPolicy(snap1CopyECDir));
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assertEquals("Got unexpected erasure coding policy", sysDefaultPolicy,
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fs.getErasureCodingPolicy(snap1));
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}
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}
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