1 files changed, 141 insertions, 0 deletions
diff --git a/zookeeper-server/src/test/java/org/apache/zookeeper/server/ZookeeperServerRestoreTest.java b/zookeeper-server/src/test/java/org/apache/zookeeper/server/ZookeeperServerRestoreTest.java
new file mode 100644
index 000000000..85f514dd7
--- /dev/null
+++ b/zookeeper-server/src/test/java/org/apache/zookeeper/server/ZookeeperServerRestoreTest.java
@@ -0,0 +1,141 @@
+/*
+ * 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.zookeeper.server;
+
+import static org.apache.zookeeper.server.persistence.FileSnap.SNAPSHOT_FILE_PREFIX;
+import static org.apache.zookeeper.test.ClientBase.CONNECTION_TIMEOUT;
+import static org.junit.jupiter.api.Assertions.assertArrayEquals;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+import java.io.File;
+import java.util.Set;
+import java.util.zip.CheckedInputStream;
+import org.apache.zookeeper.CreateMode;
+import org.apache.zookeeper.PortAssignment;
+import org.apache.zookeeper.ZKTestCase;
+import org.apache.zookeeper.ZooDefs;
+import org.apache.zookeeper.ZooKeeper;
+import org.apache.zookeeper.server.persistence.SnapStream;
+import org.apache.zookeeper.server.persistence.Util;
+import org.apache.zookeeper.test.ClientBase;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.io.TempDir;
+
+public class ZookeeperServerRestoreTest extends ZKTestCase {
+    private static final String BASE_PATH = "/restoreFromSnapshotTest";
+    private static final int NODE_COUNT = 10;
+    private static final String HOST_PORT = "127.0.0.1:" + PortAssignment.unique();
+
+    @TempDir
+    static File dataDir;
+
+    @TempDir
+    static File logDir;
+
+    @Test
+    public void testRestoreFromSnapshot() throws Exception {
+        ZooKeeperServer.setSerializeLastProcessedZxidEnabled(true);
+
+        final ZooKeeperServer zks = new ZooKeeperServer(dataDir, logDir, 3000);
+        final int port = Integer.parseInt(HOST_PORT.split(":")[1]);
+        final ServerCnxnFactory serverCnxnFactory = ServerCnxnFactory.createFactory(port, -1);
+
+        ZooKeeper zk1 = null;
+        ZooKeeper zk2 = null;
+        ZooKeeper zk3 = null;
+
+        try {
+            // start the server
+            serverCnxnFactory.startup(zks);
+            assertTrue(ClientBase.waitForServerUp(HOST_PORT, CONNECTION_TIMEOUT));
+
+            // zk1 create test data
+            zk1 = ClientBase.createZKClient(HOST_PORT);
+            for (int i = 0; i < NODE_COUNT; i++) {
+                final String path = BASE_PATH + "-" + i;
+                zk1.create(path, String.valueOf(i).getBytes(), ZooDefs.Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
+            }
+
+            // take Snapshot
+            final File snapshotFile = zks.takeSnapshot(false, false, true);
+            final long lastZxidFromSnapshot = Util.getZxidFromName(snapshotFile.getName(), SNAPSHOT_FILE_PREFIX);
+
+            // zk2 create more test data after snapshotting
+            zk2 = ClientBase.createZKClient(HOST_PORT);
+            for (int i = NODE_COUNT; i < NODE_COUNT * 2; i++) {
+                final String path = BASE_PATH + "-" + i;
+                zk2.create(path, String.valueOf(i).getBytes(), ZooDefs.Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
+            }
+
+            // restore from snapshot
+            try (final CheckedInputStream is = SnapStream.getInputStream(snapshotFile)) {
+                final long lastZxidFromRestore = zks.restoreFromSnapshot(is);
+
+                // validate the last processed zxid
+                assertEquals(lastZxidFromSnapshot, lastZxidFromRestore);
+
+                // validate restored data only contains data from snapshot
+                zk3 = ClientBase.createZKClient(HOST_PORT);
+                for (int i = 0; i < NODE_COUNT; i++) {
+                    final String path = BASE_PATH + "-" + i;
+                    final String expectedData = String.valueOf(i);
+                    assertArrayEquals(expectedData.getBytes(), zk3.getData(path, null, null));
+                }
+                assertEquals(NODE_COUNT + 3, zk3.getAllChildrenNumber("/"));
+
+                // validate sessions
+                final SessionTracker sessionTracker = zks.getSessionTracker();
+                final Set<Long> globalSessions = sessionTracker.globalSessions();
+                assertEquals(2, globalSessions.size());
+                assertTrue(globalSessions.contains(zk1.getSessionId()));
+                Assertions.assertFalse(globalSessions.contains(zk2.getSessionId()));
+                assertTrue(globalSessions.contains(zk3.getSessionId()));
+
+                // validate ZookeeperServer state
+                assertEquals(ZooKeeperServer.State.RUNNING, zks.state);
+
+                // validate being able to create more data after restore
+                zk3.create(BASE_PATH + "_" + "after", new byte[0], ZooDefs.Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
+                assertEquals(NODE_COUNT + 4, zk3.getAllChildrenNumber("/"));
+            }
+        } finally {
+            System.clearProperty("zookeeper.serializeLastProcessedZxid.enabled");
+
+            if (zk1 != null) {
+                zk1.close();
+            }
+            if (zk2 != null) {
+                zk2.close();
+            }
+            if (zk3 != null) {
+                zk3.close();
+            }
+
+            zks.shutdown();
+            serverCnxnFactory.shutdown();
+        }
+    }
+
+    @Test
+    public void testRestoreFromSnapshot_nulInputStream() throws Exception {
+        final ZooKeeperServer zks = new ZooKeeperServer(dataDir, logDir, 3000);
+        assertThrows(IllegalArgumentException.class, () -> zks.restoreFromSnapshot(null));
+    }
+}