Github user rgs1 commented on a diff in the pull request:

    https://github.com/apache/zookeeper/pull/117#discussion_r90491384
  
    --- Diff: 
src/java/test/org/apache/zookeeper/test/EmptiedSnapshotRecoveryTest.java ---
    @@ -0,0 +1,134 @@
    +/**
    + * 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.test;
    +
    +import java.io.IOException;
    +import java.io.File;
    +import java.io.PrintWriter;
    +import java.util.List;
    +import java.util.LinkedList;
    +
    +import org.apache.log4j.Logger;
    +import org.apache.zookeeper.CreateMode;
    +import org.apache.zookeeper.PortAssignment;
    +import org.apache.zookeeper.WatchedEvent;
    +import org.apache.zookeeper.Watcher;
    +import org.apache.zookeeper.ZKTestCase;
    +import org.apache.zookeeper.ZooKeeper;
    +import org.apache.zookeeper.ZooDefs.Ids;
    +import org.apache.zookeeper.server.quorum.Leader.Proposal;
    +import org.apache.zookeeper.server.ServerCnxnFactory;
    +import org.apache.zookeeper.server.SyncRequestProcessor;
    +import org.apache.zookeeper.server.ZooKeeperServer;
    +import org.apache.zookeeper.server.persistence.FileTxnSnapLog;
    +import org.junit.Assert;
    +import org.junit.Test;
    +
    +/** If snapshots are corrupted to the empty file or deleted, Zookeeper 
should 
    + *  not proceed to read its transactiong log files
    + *  Test that zxid == -1 in the presence of emptied/deleted snapshots
    + */
    +public class EmptiedSnapshotRecoveryTest extends ZKTestCase implements  
Watcher {
    +    private static final Logger LOG = 
Logger.getLogger(RestoreCommittedLogTest.class);
    +    private static String HOSTPORT = "127.0.0.1:" + 
PortAssignment.unique();
    +    private static final int CONNECTION_TIMEOUT = 3000;
    +    private static final int N_TRANSACTIONS = 150;
    +    private static final int SNAP_COUNT = 100;
    +
    +    public void runTest(boolean leaveEmptyFile) throws Exception {
    +        File tmpSnapDir = ClientBase.createTmpDir();
    +        File tmpLogDir  = ClientBase.createTmpDir();
    +        ClientBase.setupTestEnv();
    +        ZooKeeperServer zks = new ZooKeeperServer(tmpSnapDir, tmpLogDir, 
3000);
    +        SyncRequestProcessor.setSnapCount(SNAP_COUNT);
    +        final int PORT = Integer.parseInt(HOSTPORT.split(":")[1]);
    +        ServerCnxnFactory f = ServerCnxnFactory.createFactory(PORT, -1);
    +        f.startup(zks);
    +        Assert.assertTrue("waiting for server being up ",
    +                ClientBase.waitForServerUp(HOSTPORT,CONNECTION_TIMEOUT));
    +        ZooKeeper zk = new ZooKeeper(HOSTPORT, CONNECTION_TIMEOUT, this);
    +        try {
    +            for (int i = 0; i< N_TRANSACTIONS; i++) {
    +                zk.create("/node-" + i, new byte[0], Ids.OPEN_ACL_UNSAFE,
    +                        CreateMode.PERSISTENT);
    +            }
    +        } finally {
    +            zk.close();
    +        }
    +        f.shutdown();
    +        zks.shutdown();
    +        Assert.assertTrue("waiting for server to shutdown",
    +                ClientBase.waitForServerDown(HOSTPORT, 
CONNECTION_TIMEOUT));
    +
    +        // start server again with intact database
    +        zks = new ZooKeeperServer(tmpSnapDir, tmpLogDir, 3000);
    +        zks.startdata();
    +        long zxid = zks.getZKDatabase().getDataTreeLastProcessedZxid();
    +        LOG.info("After clean restart, zxid = " + zxid);
    +        Assert.assertTrue("zxid > 0", zxid > 0);
    +        zks.shutdown();
    +
    +        // Make all snapshots empty
    +        FileTxnSnapLog txnLogFactory = zks.getTxnLogFactory();
    +        List<File> snapshots = txnLogFactory.findNRecentSnapshots(10);
    +        Assert.assertTrue("We have a snapshot to corrupt", 
snapshots.size() > 0);
    +        for (File file: snapshots) {
    +            if (leaveEmptyFile) {
    +                new PrintWriter(file).close ();
    +            }
    +            else {
    --- End diff --
    
    nit: coding style `} else {`


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