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Zookeeper free workload generator

Merged Zookeeper free workload generator
zookeeper-free-workload-generator into master
Merged Sören Henning requested to merge zookeeper-free-workload-generator into master
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benchmarks/workload-generator-commons/src/main/java/theodolite/commons/workloadgeneration/communication/zookeeper/WorkloadDistributor.java deleted 100644 → 0
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package theodolite.commons.workloadgeneration.communication.zookeeper;
import java.nio.charset.StandardCharsets;
import java.util.function.BiConsumer;
import org.apache.curator.framework.CuratorFramework;
import org.apache.curator.framework.CuratorFrameworkFactory;
import org.apache.curator.framework.api.CuratorWatcher;
import org.apache.curator.framework.recipes.atomic.AtomicValue;
import org.apache.curator.framework.recipes.atomic.DistributedAtomicInteger;
import org.apache.curator.retry.ExponentialBackoffRetry;
import org.apache.zookeeper.CreateMode;
import org.apache.zookeeper.WatchedEvent;
import org.apache.zookeeper.Watcher.Event.EventType;
import org.apache.zookeeper.data.Stat;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import theodolite.commons.workloadgeneration.BeforeAction;
import theodolite.commons.workloadgeneration.KeySpace;
import theodolite.commons.workloadgeneration.misc.WorkloadDefinition;
import theodolite.commons.workloadgeneration.misc.ZooKeeper;
/**
* The central class responsible for distributing the workload through all workload generators.
*/
@Deprecated
public class WorkloadDistributor {
private static final Logger LOGGER = LoggerFactory.getLogger(WorkloadDistributor.class);
private static final String NAMESPACE = "workload-generation";
private static final String COUNTER_PATH = "/counter";
private static final String WORKLOAD_PATH = "/workload";
private static final String WORKLOAD_DEFINITION_PATH = "/workload/definition";
// Curator retry strategy
private static final int BASE_SLEEP_TIME_MS = 2000;
private static final int MAX_RETRIES = 5;
// Wait time
private static final int MAX_WAIT_TIME = 20_000;
private final DistributedAtomicInteger counter;
private final KeySpace keySpace;
private final BeforeAction beforeAction;
private final BiConsumer<WorkloadDefinition, Integer> workerAction;
private final int instances;
private final ZooKeeper zooKeeper; // NOPMD keep instance variable instead of local variable
private final CuratorFramework client;
private boolean workloadGenerationStarted = false; // NOPMD explicit intention that false
/**
* Create a new workload distributor.
*
* @param keySpace the keyspace for the workload generation.
* @param beforeAction the before action for the workload generation.
* @param workerAction the action to perform by the workers.
*/
public WorkloadDistributor(
final int instances,
final ZooKeeper zooKeeper,
final KeySpace keySpace,
final BeforeAction beforeAction,
final BiConsumer<WorkloadDefinition, Integer> workerAction) {
this.instances = instances;
this.zooKeeper = zooKeeper;
this.keySpace = keySpace;
this.beforeAction = beforeAction;
this.workerAction = workerAction;
this.client = CuratorFrameworkFactory.builder()
.namespace(NAMESPACE)
.connectString(this.zooKeeper.getHost() + ":" + this.zooKeeper.getPort())
.retryPolicy(new ExponentialBackoffRetry(BASE_SLEEP_TIME_MS, MAX_RETRIES))
.build();
this.client.start();
try {
this.client.blockUntilConnected();
} catch (final InterruptedException e) {
LOGGER.error(e.getMessage(), e);
throw new IllegalStateException(e);
}
this.counter =
new DistributedAtomicInteger(this.client, COUNTER_PATH,
new ExponentialBackoffRetry(BASE_SLEEP_TIME_MS, MAX_RETRIES));
}
/**
* Start the workload distribution.
*/
public void start() {
try {
AtomicValue<Integer> result = this.counter.increment();
while (!result.succeeded()) {
result = this.counter.increment();
}
final int workerId = result.preValue();
final CuratorWatcher watcher = this.buildWatcher(workerId);
final Stat nodeExists =
this.client.checkExists().creatingParentsIfNeeded().forPath(WORKLOAD_PATH);
if (nodeExists == null) {
this.client.create().forPath(WORKLOAD_PATH);
}
if (workerId == 0) {
LOGGER.info("This instance is master with id {}", workerId);
this.beforeAction.run();
// register worker action, as master acts also as worker
this.client.getChildren().usingWatcher(watcher).forPath(WORKLOAD_PATH);
LOGGER.info("Number of Workers: {}", this.instances);
final WorkloadDefinition definition =
new WorkloadDefinition(this.keySpace, this.instances);
this.client.create().withMode(CreateMode.EPHEMERAL).forPath(WORKLOAD_DEFINITION_PATH,
definition.toString().getBytes(StandardCharsets.UTF_8));
} else {
LOGGER.info("This instance is worker with id {}", workerId);
this.client.getChildren().usingWatcher(watcher).forPath(WORKLOAD_PATH);
final Stat definitionExists =
this.client.checkExists().creatingParentsIfNeeded().forPath(WORKLOAD_DEFINITION_PATH);
if (definitionExists != null) {
this.startWorkloadGeneration(workerId);
}
}
Thread.sleep(MAX_WAIT_TIME);
if (!this.workloadGenerationStarted) {
LOGGER.warn("No workload definition retrieved for 20 s. Terminating now..");
}
} catch (final Exception e) { // NOPMD need to catch exception because of external framework
LOGGER.error(e.getMessage(), e);
throw new IllegalStateException("Error when starting the distribution of the workload.", e);
}
}
/**
* Start the workload generation. This methods body does only get executed once.
*
* @param workerId the ID of this worker
* @throws Exception when an error occurs
*/
// NOPMD because exception thrown from used framework
private synchronized void startWorkloadGeneration(final int workerId) throws Exception { // NOPMD
if (!this.workloadGenerationStarted) {
this.workloadGenerationStarted = true;
final byte[] bytes =
this.client.getData().forPath(WORKLOAD_DEFINITION_PATH);
final WorkloadDefinition definition =
WorkloadDefinition.fromString(new String(bytes, StandardCharsets.UTF_8));
this.workerAction.accept(definition, workerId);
}
}
/**
* Build a curator watcher which performs the worker action.
*
* @param worker the worker to create the watcher for.
* @return the curator watcher.
*/
private CuratorWatcher buildWatcher(final int workerId) {
return new CuratorWatcher() {
@Override
public void process(final WatchedEvent event) {
if (event.getType() == EventType.NodeChildrenChanged) {
try {
WorkloadDistributor.this.startWorkloadGeneration(workerId);
} catch (final Exception e) { // NOPMD external framework throws exception
LOGGER.error(e.getMessage(), e);
throw new IllegalStateException("Error starting workload generation.", e);
}
}
}
};
}
/**
* Stop the workload distributor.
*/
public void stop() {
this.client.close();
}
}