Examples with NoNodeException org.apache.zookeeper.KeeperException.NoNodeException used on opensource projects

Example 11 with NoNodeException

use of org.apache.zookeeper.KeeperException.NoNodeException in project helios by spotify.

the class ZooKeeperMasterModel method getDeploymentGroupStatus.

@Override
public DeploymentGroupStatus getDeploymentGroupStatus(final String name) throws DeploymentGroupDoesNotExistException {
    log.debug("getting deployment group status: {}", name);
    final ZooKeeperClient client = provider.get("getDeploymentGroupStatus");
    final DeploymentGroup deploymentGroup = getDeploymentGroup(client, name);
    if (deploymentGroup == null) {
        return null;
    }
    try {
        final Node node = client.getNode(Paths.statusDeploymentGroup(name));
        final byte[] bytes = node.getBytes();
        if (bytes.length == 0) {
            return null;
        }
        return Json.read(bytes, DeploymentGroupStatus.class);
    } catch (NoNodeException e) {
        return null;
    } catch (KeeperException | IOException e) {
        throw new HeliosRuntimeException("getting deployment group status " + name + " failed", e);
    }
}

Example 12 with NoNodeException

use of org.apache.zookeeper.KeeperException.NoNodeException in project helios by spotify.

the class ZooKeeperMasterModel method getDeploymentGroups.

/**
   * Returns a {@link Map} of deployment group name to {@link DeploymentGroup} objects for all of
   * the deployment groups known.
   */
@Override
public Map<String, DeploymentGroup> getDeploymentGroups() {
    log.debug("getting deployment groups");
    final String folder = Paths.configDeploymentGroups();
    final ZooKeeperClient client = provider.get("getDeploymentGroups");
    try {
        final List<String> names;
        try {
            names = client.getChildren(folder);
        } catch (NoNodeException e) {
            return Maps.newHashMap();
        }
        final Map<String, DeploymentGroup> descriptors = Maps.newHashMap();
        for (final String name : names) {
            final String path = Paths.configDeploymentGroup(name);
            try {
                final byte[] data = client.getData(path);
                final DeploymentGroup descriptor = parse(data, DeploymentGroup.class);
                descriptors.put(descriptor.getName(), descriptor);
            } catch (NoNodeException e) {
                // Ignore, the deployment group was deleted before we had a chance to read it.
                log.debug("Ignoring deleted deployment group {}", name);
            }
        }
        return descriptors;
    } catch (KeeperException | IOException e) {
        throw new HeliosRuntimeException("getting deployment groups failed", e);
    }
}

Example 13 with NoNodeException

use of org.apache.zookeeper.KeeperException.NoNodeException in project helios by spotify.

the class ZooKeeperMasterModel method getDeployOperations.

private List<ZooKeeperOperation> getDeployOperations(final ZooKeeperClient client, final String host, final Deployment deployment, final String token) throws JobDoesNotExistException, JobAlreadyDeployedException, TokenVerificationException, HostNotFoundException, JobPortAllocationConflictException {
    assertHostExists(client, host);
    final JobId id = deployment.getJobId();
    final Job job = getJob(id);
    if (job == null) {
        throw new JobDoesNotExistException(id);
    }
    verifyToken(token, job);
    final UUID operationId = UUID.randomUUID();
    final String jobPath = Paths.configJob(id);
    final String taskPath = Paths.configHostJob(host, id);
    final String taskCreationPath = Paths.configHostJobCreation(host, id, operationId);
    final List<Integer> staticPorts = staticPorts(job);
    final Map<String, byte[]> portNodes = Maps.newHashMap();
    final byte[] idJson = id.toJsonBytes();
    for (final int port : staticPorts) {
        final String path = Paths.configHostPort(host, port);
        portNodes.put(path, idJson);
    }
    final Task task = new Task(job, deployment.getGoal(), deployment.getDeployerUser(), deployment.getDeployerMaster(), deployment.getDeploymentGroupName());
    final List<ZooKeeperOperation> operations = Lists.newArrayList(check(jobPath), create(portNodes), create(Paths.configJobHost(id, host)));
    // Attempt to read a task here.
    try {
        client.getNode(taskPath);
        // if we get here the node exists already
        throw new JobAlreadyDeployedException(host, id);
    } catch (NoNodeException e) {
        // if the real reason of the failure is that the job is already deployed.
        for (final int port : staticPorts) {
            checkForPortConflicts(client, host, port, id);
        }
        operations.add(create(taskPath, task));
        operations.add(create(taskCreationPath));
    } catch (KeeperException e) {
        throw new HeliosRuntimeException("reading existing task description failed", e);
    }
    return ImmutableList.copyOf(operations);
}

Example 14 with NoNodeException

use of org.apache.zookeeper.KeeperException.NoNodeException in project helios by spotify.

the class ZooKeeperMasterModel method updateDeploymentGroupHosts.

@Override
public void updateDeploymentGroupHosts(final String groupName, final List<String> hosts) throws DeploymentGroupDoesNotExistException {
    log.debug("updating deployment-group hosts: name={}", groupName);
    final ZooKeeperClient client = provider.get("updateDeploymentGroupHosts");
    try {
        final DeploymentGroupStatus status = getDeploymentGroupStatus(groupName);
        if (!allowHostChange(status)) {
            return;
        }
        // statusDeploymentGroupRemovedHosts may not exist for deployment groups created before it was
        // introduced.
        client.ensurePathAndSetData(Paths.statusDeploymentGroupRemovedHosts(groupName), Json.asBytesUnchecked(emptyList()));
        final List<String> curHosts = getHosts(client, Paths.statusDeploymentGroupHosts(groupName));
        final List<String> previouslyRemovedHosts = getHosts(client, Paths.statusDeploymentGroupRemovedHosts(groupName));
        final List<String> removedHosts = removedHosts(curHosts, hosts, previouslyRemovedHosts);
        if (hosts.equals(curHosts) && removedHosts.equals(previouslyRemovedHosts)) {
            return;
        }
        log.info("for deployment-group name={}, curHosts={}, new hosts={}, " + "previouslyRemovedHosts={}, derived removedHosts={}", groupName, curHosts, hosts, previouslyRemovedHosts, removedHosts);
        final List<ZooKeeperOperation> ops = Lists.newArrayList();
        ops.add(set(Paths.statusDeploymentGroupHosts(groupName), Json.asBytes(hosts)));
        ops.add(set(Paths.statusDeploymentGroupRemovedHosts(groupName), Json.asBytes(removedHosts)));
        final Node dgn = client.getNode(Paths.configDeploymentGroup(groupName));
        final Integer deploymentGroupVersion = dgn.getStat().getVersion();
        DeploymentGroup deploymentGroup = Json.read(dgn.getBytes(), DeploymentGroup.class);
        List<Map<String, Object>> events = ImmutableList.of();
        if (deploymentGroup.getJobId() != null && updateOnHostChange(deploymentGroup, status)) {
            deploymentGroup = deploymentGroup.toBuilder().setRollingUpdateReason(HOSTS_CHANGED).build();
            // Fail transaction if the deployment group has been updated elsewhere.
            ops.add(check(Paths.configDeploymentGroup(groupName), deploymentGroupVersion));
            // NOTE: If the DG was removed this set() cause the transaction to fail, because
            // removing the DG removes this node. It's *important* that there's an operation that
            // causes the transaction to fail if the DG was removed or we'll end up with
            // inconsistent state.
            ops.add(set(Paths.configDeploymentGroup(deploymentGroup.getName()), deploymentGroup));
            final RollingUpdateOp op = getInitRollingUpdateOps(deploymentGroup, hosts, removedHosts, client);
            ops.addAll(op.operations());
            events = op.events();
        }
        log.info("starting zookeeper transaction for updateDeploymentGroupHosts on deployment-group: " + "name={} jobId={} operations={}", groupName, deploymentGroup.getJobId(), ops);
        client.transaction(ops);
        emitEvents(deploymentGroupEventTopic, events);
    } catch (BadVersionException e) {
        // some other master beat us in processing this host update. not exceptional.
        // ideally we would check the path in the exception, but curator doesn't provide a path
        // for exceptions thrown as part of a transaction.
        log.info("zookeeper transaction for updateDeploymentGroupHosts on deployment-group was " + "processed by another master: name={}", groupName);
    } catch (NoNodeException e) {
        throw new DeploymentGroupDoesNotExistException(groupName, e);
    } catch (KeeperException | IOException e) {
        throw new HeliosRuntimeException("updating deployment group hosts failed", e);
    }
}

Example 15 with NoNodeException

use of org.apache.zookeeper.KeeperException.NoNodeException in project helios by spotify.

the class ZooKeeperMasterModel method getJobHistory.

/**
   * Given a jobId and host, returns the N most recent events in its history on that host in the
   * cluster.
   */
@Override
public List<TaskStatusEvent> getJobHistory(final JobId jobId, final String host) throws JobDoesNotExistException {
    final Job descriptor = getJob(jobId);
    if (descriptor == null) {
        throw new JobDoesNotExistException(jobId);
    }
    final ZooKeeperClient client = provider.get("getJobHistory");
    final List<String> hosts;
    try {
        hosts = (!isNullOrEmpty(host)) ? singletonList(host) : client.getChildren(Paths.historyJobHosts(jobId));
    } catch (NoNodeException e) {
        return emptyList();
    } catch (KeeperException e) {
        throw Throwables.propagate(e);
    }
    final List<TaskStatusEvent> jsEvents = Lists.newArrayList();
    for (final String h : hosts) {
        final List<String> events;
        try {
            events = client.getChildren(Paths.historyJobHostEvents(jobId, h));
        } catch (NoNodeException e) {
            continue;
        } catch (KeeperException e) {
            throw Throwables.propagate(e);
        }
        for (final String event : events) {
            try {
                final byte[] data = client.getData(Paths.historyJobHostEventsTimestamp(jobId, h, Long.valueOf(event)));
                final TaskStatus status = Json.read(data, TaskStatus.class);
                jsEvents.add(new TaskStatusEvent(status, Long.valueOf(event), h));
            } catch (NoNodeException e) {
            // ignore, it went away before we read it
            } catch (KeeperException | IOException e) {
                throw Throwables.propagate(e);
            }
        }
    }
    return Ordering.from(EVENT_COMPARATOR).sortedCopy(jsEvents);
}