Java FileTxnLog.getLogFiles方法代碼示例

import org.apache.zookeeper.server.persistence.FileTxnLog; //導入方法依賴的package包/類
/**
 * create the old snapshot database
 * apply logs to it and create the final
 * database
 * @throws IOException
 */
private void loadThisSnapShot() throws IOException {  
    // pick the most recent snapshot
    File snapshot = findMostRecentSnapshot();
    if (snapshot == null) {
        throw new IOException("Invalid snapshots " +
        		"or not snapshots in " + snapShotDir);
    }
    InputStream inputstream = new BufferedInputStream(
            new FileInputStream(snapshot));
    InputArchive ia = BinaryInputArchive.getArchive(inputstream);
    deserializeSnapshot(oldDataTree, ia, sessionsWithTimeouts);
    //ok done with the snapshot 
    // now apply the logs
    long snapshotZxid = oldDataTree.lastProcessedZxid;
    File[] files = FileTxnLog.getLogFiles(
            dataDir.listFiles(), snapshotZxid);
    long zxid = processLogFiles(oldDataTree, files);
    //check for this zxid to be sane
    if (zxid != oldDataTree.lastProcessedZxid) {
        LOG.error("Zxids not equal " + " log zxid " +
                zxid + " datatree processed " + oldDataTree.lastProcessedZxid);
    }
}
 

import org.apache.zookeeper.server.persistence.FileTxnLog; //導入方法依賴的package包/類
@Test
public void testGetLogFiles() {
    File[] files = new File[5];

    files[0] = new File("log.10027c6de");
    files[1] = new File("log.10027c6df");
    files[2] = new File("snapshot.10027c6dd");
    files[3] = new File("log.10027c6dc");
    files[4] = new File("log.20027c6dc");

    File[] orig = files.clone();

    File[] filelist =
            FileTxnLog.getLogFiles(files,
            Long.parseLong("10027c6de", 16));

    Assert.assertEquals(3, filelist.length);
    Assert.assertEquals(orig[0], filelist[0]);
    Assert.assertEquals(orig[1], filelist[1]);
    Assert.assertEquals(orig[4], filelist[2]);
}
 

import org.apache.zookeeper.server.persistence.FileTxnLog; //導入方法依賴的package包/類
@Test
public void testGetLogFiles() {
    File[] files = new File[5];

    files[0] = new File("log.10027c6de");
    files[1] = new File("log.10027c6df");
    files[2] = new File("snapshot.10027c6dd");
    files[3] = new File("log.10027c6dc");
    files[4] = new File("log.20027c6dc");

    File[] orig = files.clone();

    File[] filelist =
            FileTxnLog.getLogFiles(files,
            Long.parseLong("10027c6de", 16));

    assertEquals(3, filelist.length);
    assertEquals(orig[0], filelist[0]);
    assertEquals(orig[1], filelist[1]);
    assertEquals(orig[4], filelist[2]);
}
 

import org.apache.zookeeper.server.persistence.FileTxnLog; //導入方法依賴的package包/類
/**
 * test that we fail to load txnlog of a request zxid that is older
 * than what exist on disk
 * @throws Exception an exception might be thrown here
 */
@Test
public void testLoadFailure() throws Exception {
    final String hostPort = HOST + PortAssignment.unique();
    // setup a single server cluster
    File tmpDir = ClientBase.createTmpDir();
    ClientBase.setupTestEnv();
    ZooKeeperServer zks = new ZooKeeperServer(tmpDir, tmpDir, 3000);
    // So we have at least 4 logs
    SyncRequestProcessor.setSnapCount(50);
    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 = ClientBase.createZKClient(hostPort);

    // generate some transactions that will get logged
    try {
        for (int i = 0; i< NUM_MESSAGES; i++) {
            zk.create("/data-", new byte[0], Ids.OPEN_ACL_UNSAFE,
                    CreateMode.PERSISTENT_SEQUENTIAL);
        }
    } finally {
        zk.close();
    }
    f.shutdown();
    Assert.assertTrue("waiting for server to shutdown",
            ClientBase.waitForServerDown(hostPort, CONNECTION_TIMEOUT));

    File logDir = new File(tmpDir, FileTxnSnapLog.version + FileTxnSnapLog.VERSION);
    File[] logFiles = FileTxnLog.getLogFiles(logDir.listFiles(), 0);
    // Verify that we have at least 4 txnlog
    Assert.assertTrue(logFiles.length > 4);
    // Delete the first log file, so we will fail to read it back from disk
    Assert.assertTrue("delete the first log file", logFiles[0].delete());

    // Find zxid for the second log
    long secondStartZxid = Util.getZxidFromName(logFiles[1].getName(), "log");

    FileTxnLog txnLog = new FileTxnLog(logDir);
    TxnIterator itr = txnLog.read(1, false);

    // Oldest log is already remove, so this should point to the start of
    // of zxid on the second log
    Assert.assertEquals(secondStartZxid, itr.getHeader().getZxid());

    itr = txnLog.read(secondStartZxid, false);
    Assert.assertEquals(secondStartZxid, itr.getHeader().getZxid());
    Assert.assertTrue(itr.next());

    // Trying to get a second txn on second txnlog give us the
    // the start of second log, since the first one is removed
    long nextZxid = itr.getHeader().getZxid();

    itr = txnLog.read(nextZxid, false);
    Assert.assertEquals(secondStartZxid, itr.getHeader().getZxid());

    // Trying to get a first txn on the third give us the
    // the start of second log, since the first one is removed
    long thirdStartZxid = Util.getZxidFromName(logFiles[2].getName(), "log");
    itr = txnLog.read(thirdStartZxid, false);
    Assert.assertEquals(secondStartZxid, itr.getHeader().getZxid());
    Assert.assertTrue(itr.next());

    nextZxid = itr.getHeader().getZxid();
    itr = txnLog.read(nextZxid, false);
    Assert.assertEquals(secondStartZxid, itr.getHeader().getZxid());

}
 

import org.apache.zookeeper.server.persistence.FileTxnLog; //導入方法依賴的package包/類
/**
 * test that we fail to load txnlog of a request zxid that is older
 * than what exist on disk
 * @throws Exception an exception might be thrown here
 */
@Test
public void testLoadFailure() throws Exception {
    // setup a single server cluster
    File tmpDir = ClientBase.createTmpDir();
    ClientBase.setupTestEnv();
    ZooKeeperServer zks = new ZooKeeperServer(tmpDir, tmpDir, 3000);
    // So we have at least 4 logs
    SyncRequestProcessor.setSnapCount(50);
    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);

    // generate some transactions that will get logged
    try {
        for (int i = 0; i< NUM_MESSAGES; i++) {
            zk.create("/data-", new byte[0], Ids.OPEN_ACL_UNSAFE,
                    CreateMode.PERSISTENT_SEQUENTIAL);
        }
    } finally {
        zk.close();
    }
    f.shutdown();
    Assert.assertTrue("waiting for server to shutdown",
            ClientBase.waitForServerDown(HOSTPORT, CONNECTION_TIMEOUT));

    File logDir = new File(tmpDir, FileTxnSnapLog.version + FileTxnSnapLog.VERSION);
    File[] logFiles = FileTxnLog.getLogFiles(logDir.listFiles(), 0);
    // Verify that we have at least 4 txnlog
    Assert.assertTrue(logFiles.length > 4);
    // Delete the first log file, so we will fail to read it back from disk
    Assert.assertTrue("delete the first log file", logFiles[0].delete());

    // Find zxid for the second log
    long secondStartZxid = Util.getZxidFromName(logFiles[1].getName(), "log");

    FileTxnLog txnLog = new FileTxnLog(logDir);
    TxnIterator itr = txnLog.read(1, false);

    // Oldest log is already remove, so this should point to the start of
    // of zxid on the second log
    Assert.assertEquals(secondStartZxid, itr.getHeader().getZxid());

    itr = txnLog.read(secondStartZxid, false);
    Assert.assertEquals(secondStartZxid, itr.getHeader().getZxid());
    Assert.assertTrue(itr.next());

    // Trying to get a second txn on second txnlog give us the
    // the start of second log, since the first one is removed
    long nextZxid = itr.getHeader().getZxid();

    itr = txnLog.read(nextZxid, false);
    Assert.assertEquals(secondStartZxid, itr.getHeader().getZxid());

    // Trying to get a first txn on the third give us the
    // the start of second log, since the first one is removed
    long thirdStartZxid = Util.getZxidFromName(logFiles[2].getName(), "log");
    itr = txnLog.read(thirdStartZxid, false);
    Assert.assertEquals(secondStartZxid, itr.getHeader().getZxid());
    Assert.assertTrue(itr.next());

    nextZxid = itr.getHeader().getZxid();
    itr = txnLog.read(nextZxid, false);
    Assert.assertEquals(secondStartZxid, itr.getHeader().getZxid());

}