Examples with Transaction org.apache.zookeeper.Transaction used on opensource projects

Example 1 with Transaction

use of org.apache.zookeeper.Transaction in project zookeeper by apache.

the class MultiTransactionTest method testChRootTransaction.

@Test
public void testChRootTransaction() throws Exception {
    // creating the subtree for chRoot clients.
    String chRoot = createNameSpace();
    // checking the child version using chRoot client.
    zk_chroot = createClient(this.hostPort + chRoot);
    String childPath = "/myid";
    Transaction transaction = zk_chroot.transaction();
    transaction.create(childPath, new byte[0], Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
    transaction.check(childPath, 0);
    transaction.setData(childPath, childPath.getBytes(), 0);
    commit(transaction);
    Assert.assertNotNull("zNode is not created under chroot:" + chRoot, zk.exists(chRoot + childPath, false));
    Assert.assertNotNull("zNode is not created under chroot:" + chRoot, zk_chroot.exists(childPath, false));
    Assert.assertNull("zNode is created directly under '/', ignored configured chroot", zk.exists(childPath, false));
    Assert.assertArrayEquals("zNode data not matching", childPath.getBytes(), zk_chroot.getData(childPath, false, null));
    transaction = zk_chroot.transaction();
    // Deleting child using chRoot client.
    transaction.delete(childPath, 1);
    commit(transaction);
    Assert.assertNull("chroot:" + chRoot + " exists after delete", zk.exists(chRoot + "/myid", false));
    Assert.assertNull("chroot:" + chRoot + " exists after delete", zk_chroot.exists("/myid", false));
}

Example 2 with Transaction

use of org.apache.zookeeper.Transaction in project distributedlog by twitter.

the class FederatedZKLogMetadataStore method createLogInNamespaceSync.

void createLogInNamespaceSync(URI uri, String logName) throws InterruptedException, IOException, KeeperException {
    Transaction txn = zkc.get().transaction();
    // we don't have the zk version yet. set it to 0 instead of -1, to prevent non CAS operation.
    int zkVersion = null == zkSubnamespacesVersion.get() ? 0 : zkSubnamespacesVersion.get();
    txn.setData(zkSubnamespacesPath, uri.getPath().getBytes(UTF_8), zkVersion);
    String logPath = uri.getPath() + "/" + logName;
    txn.create(logPath, new byte[0], zkc.getDefaultACL(), CreateMode.PERSISTENT);
    try {
        txn.commit();
        // if the transaction succeed, the zk version is advanced
        setZkSubnamespacesVersion(zkVersion + 1);
    } catch (KeeperException ke) {
        List<OpResult> opResults = ke.getResults();
        OpResult createResult = opResults.get(1);
        if (createResult instanceof OpResult.ErrorResult) {
            OpResult.ErrorResult errorResult = (OpResult.ErrorResult) createResult;
            if (Code.NODEEXISTS.intValue() == errorResult.getErr()) {
                throw new LogExistsException("Log " + logName + " already exists");
            }
        }
        OpResult setResult = opResults.get(0);
        if (setResult instanceof OpResult.ErrorResult) {
            OpResult.ErrorResult errorResult = (OpResult.ErrorResult) setResult;
            if (Code.BADVERSION.intValue() == errorResult.getErr()) {
                throw KeeperException.create(Code.BADVERSION);
            }
        }
        throw new ZKException("ZK exception in creating log " + logName + " in " + uri, ke);
    }
}

Example 3 with Transaction

use of org.apache.zookeeper.Transaction in project zookeeper by apache.

the class ReadOnlyModeTest method testMultiTransaction.

/**
     * Test write operations using multi request.
     */
@Test(timeout = 90000)
public void testMultiTransaction() throws Exception {
    CountdownWatcher watcher = new CountdownWatcher();
    ZooKeeper zk = new ZooKeeper(qu.getConnString(), CONNECTION_TIMEOUT, watcher, true);
    // ensure zk got connected
    watcher.waitForConnected(CONNECTION_TIMEOUT);
    final String data = "Data to be read in RO mode";
    final String node1 = "/tnode1";
    final String node2 = "/tnode2";
    zk.create(node1, data.getBytes(), ZooDefs.Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
    watcher.reset();
    qu.shutdown(2);
    watcher.waitForConnected(CONNECTION_TIMEOUT);
    Assert.assertEquals("Should be in r-o mode", States.CONNECTEDREADONLY, zk.getState());
    // read operation during r/o mode
    String remoteData = new String(zk.getData(node1, false, null));
    Assert.assertEquals("Failed to read data in r-o mode", data, remoteData);
    try {
        Transaction transaction = zk.transaction();
        transaction.setData(node1, "no way".getBytes(), -1);
        transaction.create(node2, data.getBytes(), ZooDefs.Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
        transaction.commit();
        Assert.fail("Write operation using multi-transaction" + " api has succeeded during RO mode");
    } catch (NotReadOnlyException e) {
    // ok
    }
    Assert.assertNull("Should have created the znode:" + node2, zk.exists(node2, false));
}

Example 4 with Transaction

use of org.apache.zookeeper.Transaction in project distributedlog by twitter.

the class TestZKLogMetadataForWriter method createLog.

private static void createLog(ZooKeeperClient zk, URI uri, String logName, String logIdentifier) throws Exception {
    final String logRootPath = getLogRootPath(uri, logName, logIdentifier);
    final String logSegmentsPath = logRootPath + LOGSEGMENTS_PATH;
    final String maxTxIdPath = logRootPath + MAX_TXID_PATH;
    final String lockPath = logRootPath + LOCK_PATH;
    final String readLockPath = logRootPath + READ_LOCK_PATH;
    final String versionPath = logRootPath + VERSION_PATH;
    final String allocationPath = logRootPath + ALLOCATION_PATH;
    Utils.zkCreateFullPathOptimistic(zk, logRootPath, new byte[0], zk.getDefaultACL(), CreateMode.PERSISTENT);
    Transaction txn = zk.get().transaction();
    txn.create(logSegmentsPath, DLUtils.serializeLogSegmentSequenceNumber(DistributedLogConstants.UNASSIGNED_LOGSEGMENT_SEQNO), zk.getDefaultACL(), CreateMode.PERSISTENT);
    txn.create(maxTxIdPath, DLUtils.serializeTransactionId(0L), zk.getDefaultACL(), CreateMode.PERSISTENT);
    txn.create(lockPath, DistributedLogConstants.EMPTY_BYTES, zk.getDefaultACL(), CreateMode.PERSISTENT);
    txn.create(readLockPath, DistributedLogConstants.EMPTY_BYTES, zk.getDefaultACL(), CreateMode.PERSISTENT);
    txn.create(versionPath, ZKLogMetadataForWriter.intToBytes(LAYOUT_VERSION), zk.getDefaultACL(), CreateMode.PERSISTENT);
    txn.create(allocationPath, DistributedLogConstants.EMPTY_BYTES, zk.getDefaultACL(), CreateMode.PERSISTENT);
    txn.commit();
}