org.apache.hive.spark.client.SparkClientImpl Maven / Gradle / Ivy
/*
* 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.hive.spark.client;
import static org.apache.hadoop.fs.CommonConfigurationKeysPublic.HADOOP_SECURITY_AUTHENTICATION;
import com.google.common.base.Charsets;
import com.google.common.base.Joiner;
import com.google.common.base.Strings;
import com.google.common.base.Preconditions;
import com.google.common.base.Throwables;
import com.google.common.collect.Lists;
import com.google.common.collect.Maps;
import com.google.common.io.Resources;
import io.netty.channel.ChannelHandlerContext;
import io.netty.util.concurrent.GenericFutureListener;
import io.netty.util.concurrent.Promise;
import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.Serializable;
import java.io.Writer;
import java.net.URI;
import java.net.URL;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.Properties;
import java.util.UUID;
import java.util.concurrent.Future;
import java.util.concurrent.TimeoutException;
import java.util.concurrent.atomic.AtomicInteger;
import org.apache.commons.lang3.StringUtils;
import org.apache.hadoop.hive.conf.Constants;
import org.apache.hadoop.hive.conf.HiveConf;
import org.apache.hadoop.hive.conf.HiveConf.ConfVars;
import org.apache.hadoop.hive.shims.Utils;
import org.apache.hadoop.security.SecurityUtil;
import org.apache.hive.spark.client.rpc.Rpc;
import org.apache.hive.spark.client.rpc.RpcConfiguration;
import org.apache.hive.spark.client.rpc.RpcServer;
import org.apache.spark.SparkContext;
import org.apache.spark.SparkException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
class SparkClientImpl implements SparkClient {
private static final long serialVersionUID = 1L;
private static final Logger LOG = LoggerFactory.getLogger(SparkClientImpl.class);
private static final long DEFAULT_SHUTDOWN_TIMEOUT = 10000; // In milliseconds
private static final long MAX_ERR_LOG_LINES_FOR_RPC = 1000;
private static final String OSX_TEST_OPTS = "SPARK_OSX_TEST_OPTS";
private static final String SPARK_HOME_ENV = "SPARK_HOME";
private static final String SPARK_HOME_KEY = "spark.home";
private static final String DRIVER_OPTS_KEY = "spark.driver.extraJavaOptions";
private static final String EXECUTOR_OPTS_KEY = "spark.executor.extraJavaOptions";
private static final String DRIVER_EXTRA_CLASSPATH = "spark.driver.extraClassPath";
private static final String EXECUTOR_EXTRA_CLASSPATH = "spark.executor.extraClassPath";
private final Map conf;
private final HiveConf hiveConf;
private final AtomicInteger childIdGenerator;
private final Thread driverThread;
private final Map> jobs;
private final Rpc driverRpc;
private final ClientProtocol protocol;
private volatile boolean isAlive;
SparkClientImpl(RpcServer rpcServer, Map conf, HiveConf hiveConf) throws IOException, SparkException {
this.conf = conf;
this.hiveConf = hiveConf;
this.childIdGenerator = new AtomicInteger();
this.jobs = Maps.newConcurrentMap();
String clientId = UUID.randomUUID().toString();
String secret = rpcServer.createSecret();
this.driverThread = startDriver(rpcServer, clientId, secret);
this.protocol = new ClientProtocol();
try {
// The RPC server will take care of timeouts here.
this.driverRpc = rpcServer.registerClient(clientId, secret, protocol).get();
} catch (Throwable e) {
if (e.getCause() instanceof TimeoutException) {
LOG.error("Timed out waiting for client to connect.\nPossible reasons include network " +
"issues, errors in remote driver or the cluster has no available resources, etc." +
"\nPlease check YARN or Spark driver's logs for further information.", e);
} else {
LOG.error("Error while waiting for client to connect.", e);
}
driverThread.interrupt();
try {
driverThread.join();
} catch (InterruptedException ie) {
// Give up.
LOG.debug("Interrupted before driver thread was finished.");
}
throw Throwables.propagate(e);
}
driverRpc.addListener(new Rpc.Listener() {
@Override
public void rpcClosed(Rpc rpc) {
if (isAlive) {
LOG.warn("Client RPC channel closed unexpectedly.");
isAlive = false;
}
}
});
isAlive = true;
}
@Override
public JobHandle submit(Job job) {
return protocol.submit(job, Collections.>emptyList());
}
@Override
public JobHandle submit(Job job, List> listeners) {
return protocol.submit(job, listeners);
}
@Override
public Future run(Job job) {
return protocol.run(job);
}
@Override
public void stop() {
if (isAlive) {
isAlive = false;
try {
protocol.endSession();
} catch (Exception e) {
LOG.warn("Exception while waiting for end session reply.", e);
} finally {
driverRpc.close();
}
}
long endTime = System.currentTimeMillis() + DEFAULT_SHUTDOWN_TIMEOUT;
try {
driverThread.join(DEFAULT_SHUTDOWN_TIMEOUT);
} catch (InterruptedException ie) {
LOG.debug("Interrupted before driver thread was finished.");
}
if (endTime - System.currentTimeMillis() <= 0) {
LOG.warn("Timed out shutting down remote driver, interrupting...");
driverThread.interrupt();
}
}
@Override
public Future addJar(URI uri) {
return run(new AddJarJob(uri.toString()));
}
@Override
public Future addFile(URI uri) {
return run(new AddFileJob(uri.toString()));
}
@Override
public Future getExecutorCount() {
return run(new GetExecutorCountJob());
}
@Override
public Future getDefaultParallelism() {
return run(new GetDefaultParallelismJob());
}
@Override
public boolean isActive() {
return isAlive && driverRpc.isActive();
}
void cancel(String jobId) {
protocol.cancel(jobId);
}
private Thread startDriver(final RpcServer rpcServer, final String clientId, final String secret)
throws IOException {
Runnable runnable;
final String serverAddress = rpcServer.getAddress();
final String serverPort = String.valueOf(rpcServer.getPort());
if (conf.containsKey(SparkClientFactory.CONF_KEY_IN_PROCESS)) {
// Mostly for testing things quickly. Do not do this in production.
// when invoked in-process it inherits the environment variables of the parent
LOG.warn("!!!! Running remote driver in-process. !!!!");
runnable = new Runnable() {
@Override
public void run() {
List args = Lists.newArrayList();
args.add("--remote-host");
args.add(serverAddress);
args.add("--remote-port");
args.add(serverPort);
args.add("--client-id");
args.add(clientId);
args.add("--secret");
args.add(secret);
for (Map.Entry e : conf.entrySet()) {
args.add("--conf");
args.add(String.format("%s=%s", e.getKey(), conf.get(e.getKey())));
}
try {
RemoteDriver.main(args.toArray(new String[args.size()]));
} catch (Exception e) {
LOG.error("Error running driver.", e);
}
}
};
} else {
// If a Spark installation is provided, use the spark-submit script. Otherwise, call the
// SparkSubmit class directly, which has some caveats (like having to provide a proper
// version of Guava on the classpath depending on the deploy mode).
String sparkHome = Strings.emptyToNull(conf.get(SPARK_HOME_KEY));
if (sparkHome == null) {
sparkHome = Strings.emptyToNull(System.getenv(SPARK_HOME_ENV));
}
if (sparkHome == null) {
sparkHome = Strings.emptyToNull(System.getProperty(SPARK_HOME_KEY));
}
String sparkLogDir = conf.get("hive.spark.log.dir");
if (sparkLogDir == null) {
if (sparkHome == null) {
sparkLogDir = "./target/";
} else {
sparkLogDir = sparkHome + "/logs/";
}
}
String osxTestOpts = "";
if (Strings.nullToEmpty(System.getProperty("os.name")).toLowerCase().contains("mac")) {
osxTestOpts = Strings.nullToEmpty(System.getenv(OSX_TEST_OPTS));
}
String driverJavaOpts = Joiner.on(" ").skipNulls().join(
"-Dhive.spark.log.dir=" + sparkLogDir, osxTestOpts, conf.get(DRIVER_OPTS_KEY));
String executorJavaOpts = Joiner.on(" ").skipNulls().join(
"-Dhive.spark.log.dir=" + sparkLogDir, osxTestOpts, conf.get(EXECUTOR_OPTS_KEY));
// Create a file with all the job properties to be read by spark-submit. Change the
// file's permissions so that only the owner can read it. This avoid having the
// connection secret show up in the child process's command line.
File properties = File.createTempFile("spark-submit.", ".properties");
if (!properties.setReadable(false) || !properties.setReadable(true, true)) {
throw new IOException("Cannot change permissions of job properties file.");
}
properties.deleteOnExit();
Properties allProps = new Properties();
// first load the defaults from spark-defaults.conf if available
try {
URL sparkDefaultsUrl = Thread.currentThread().getContextClassLoader().getResource("spark-defaults.conf");
if (sparkDefaultsUrl != null) {
LOG.info("Loading spark defaults: " + sparkDefaultsUrl);
allProps.load(new ByteArrayInputStream(Resources.toByteArray(sparkDefaultsUrl)));
}
} catch (Exception e) {
String msg = "Exception trying to load spark-defaults.conf: " + e;
throw new IOException(msg, e);
}
// then load the SparkClientImpl config
for (Map.Entry e : conf.entrySet()) {
allProps.put(e.getKey(), conf.get(e.getKey()));
}
allProps.put(SparkClientFactory.CONF_CLIENT_ID, clientId);
allProps.put(SparkClientFactory.CONF_KEY_SECRET, secret);
allProps.put(DRIVER_OPTS_KEY, driverJavaOpts);
allProps.put(EXECUTOR_OPTS_KEY, executorJavaOpts);
String isTesting = conf.get("spark.testing");
if (isTesting != null && isTesting.equalsIgnoreCase("true")) {
String hiveHadoopTestClasspath = Strings.nullToEmpty(System.getenv("HIVE_HADOOP_TEST_CLASSPATH"));
if (!hiveHadoopTestClasspath.isEmpty()) {
String extraDriverClasspath = Strings.nullToEmpty((String)allProps.get(DRIVER_EXTRA_CLASSPATH));
if (extraDriverClasspath.isEmpty()) {
allProps.put(DRIVER_EXTRA_CLASSPATH, hiveHadoopTestClasspath);
} else {
extraDriverClasspath = extraDriverClasspath.endsWith(File.pathSeparator) ? extraDriverClasspath : extraDriverClasspath + File.pathSeparator;
allProps.put(DRIVER_EXTRA_CLASSPATH, extraDriverClasspath + hiveHadoopTestClasspath);
}
String extraExecutorClasspath = Strings.nullToEmpty((String)allProps.get(EXECUTOR_EXTRA_CLASSPATH));
if (extraExecutorClasspath.isEmpty()) {
allProps.put(EXECUTOR_EXTRA_CLASSPATH, hiveHadoopTestClasspath);
} else {
extraExecutorClasspath = extraExecutorClasspath.endsWith(File.pathSeparator) ? extraExecutorClasspath : extraExecutorClasspath + File.pathSeparator;
allProps.put(EXECUTOR_EXTRA_CLASSPATH, extraExecutorClasspath + hiveHadoopTestClasspath);
}
}
}
Writer writer = new OutputStreamWriter(new FileOutputStream(properties), Charsets.UTF_8);
try {
allProps.store(writer, "Spark Context configuration");
} finally {
writer.close();
}
// Define how to pass options to the child process. If launching in client (or local)
// mode, the driver options need to be passed directly on the command line. Otherwise,
// SparkSubmit will take care of that for us.
String master = conf.get("spark.master");
Preconditions.checkArgument(master != null, "spark.master is not defined.");
String deployMode = conf.get("spark.submit.deployMode");
List argv = Lists.newLinkedList();
if (sparkHome != null) {
argv.add(new File(sparkHome, "bin/spark-submit").getAbsolutePath());
} else {
LOG.info("No spark.home provided, calling SparkSubmit directly.");
argv.add(new File(System.getProperty("java.home"), "bin/java").getAbsolutePath());
if (master.startsWith("local") || master.startsWith("mesos") ||
SparkClientUtilities.isYarnClientMode(master, deployMode) ||
master.startsWith("spark")) {
String mem = conf.get("spark.driver.memory");
if (mem != null) {
argv.add("-Xms" + mem);
argv.add("-Xmx" + mem);
}
String cp = conf.get("spark.driver.extraClassPath");
if (cp != null) {
argv.add("-classpath");
argv.add(cp);
}
String libPath = conf.get("spark.driver.extraLibPath");
if (libPath != null) {
argv.add("-Djava.library.path=" + libPath);
}
String extra = conf.get(DRIVER_OPTS_KEY);
if (extra != null) {
for (String opt : extra.split("[ ]")) {
if (!opt.trim().isEmpty()) {
argv.add(opt.trim());
}
}
}
}
argv.add("org.apache.spark.deploy.SparkSubmit");
}
if (SparkClientUtilities.isYarnClusterMode(master, deployMode)) {
String executorCores = conf.get("spark.executor.cores");
if (executorCores != null) {
argv.add("--executor-cores");
argv.add(executorCores);
}
String executorMemory = conf.get("spark.executor.memory");
if (executorMemory != null) {
argv.add("--executor-memory");
argv.add(executorMemory);
}
String numOfExecutors = conf.get("spark.executor.instances");
if (numOfExecutors != null) {
argv.add("--num-executors");
argv.add(numOfExecutors);
}
}
// The options --principal/--keypad do not work with --proxy-user in spark-submit.sh
// (see HIVE-15485, SPARK-5493, SPARK-19143), so Hive could only support doAs or
// delegation token renewal, but not both. Since doAs is a more common case, if both
// are needed, we choose to favor doAs. So when doAs is enabled, we use kinit command,
// otherwise, we pass the principal/keypad to spark to support the token renewal for
// long-running application.
if ("kerberos".equals(hiveConf.get(HADOOP_SECURITY_AUTHENTICATION))) {
String principal = SecurityUtil.getServerPrincipal(hiveConf.getVar(ConfVars.HIVE_SERVER2_KERBEROS_PRINCIPAL),
"0.0.0.0");
String keyTabFile = hiveConf.getVar(ConfVars.HIVE_SERVER2_KERBEROS_KEYTAB);
if (StringUtils.isNotBlank(principal) && StringUtils.isNotBlank(keyTabFile)) {
if (hiveConf.getBoolVar(HiveConf.ConfVars.HIVE_SERVER2_ENABLE_DOAS)) {
List kinitArgv = Lists.newLinkedList();
kinitArgv.add("kinit");
kinitArgv.add(principal);
kinitArgv.add("-k");
kinitArgv.add("-t");
kinitArgv.add(keyTabFile + ";");
kinitArgv.addAll(argv);
argv = kinitArgv;
} else {
// if doAs is not enabled, we pass the principal/keypad to spark-submit in order to
// support the possible delegation token renewal in Spark
argv.add("--principal");
argv.add(principal);
argv.add("--keytab");
argv.add(keyTabFile);
}
}
}
if (hiveConf.getBoolVar(HiveConf.ConfVars.HIVE_SERVER2_ENABLE_DOAS)) {
try {
String currentUser = Utils.getUGI().getShortUserName();
// do not do impersonation in CLI mode
if (!currentUser.equals(System.getProperty("user.name"))) {
LOG.info("Attempting impersonation of " + currentUser);
argv.add("--proxy-user");
argv.add(currentUser);
}
} catch (Exception e) {
String msg = "Cannot obtain username: " + e;
throw new IllegalStateException(msg, e);
}
}
argv.add("--properties-file");
argv.add(properties.getAbsolutePath());
argv.add("--class");
argv.add(RemoteDriver.class.getName());
String jar = "spark-internal";
if (SparkContext.jarOfClass(this.getClass()).isDefined()) {
jar = SparkContext.jarOfClass(this.getClass()).get();
}
argv.add(jar);
argv.add("--remote-host");
argv.add(serverAddress);
argv.add("--remote-port");
argv.add(serverPort);
//hive.spark.* keys are passed down to the RemoteDriver via --conf,
//as --properties-file contains the spark.* keys that are meant for SparkConf object.
for (String hiveSparkConfKey : RpcConfiguration.HIVE_SPARK_RSC_CONFIGS) {
String value = RpcConfiguration.getValue(hiveConf, hiveSparkConfKey);
argv.add("--conf");
argv.add(String.format("%s=%s", hiveSparkConfKey, value));
}
String cmd = Joiner.on(" ").join(argv);
LOG.info("Running client driver with argv: {}", cmd);
ProcessBuilder pb = new ProcessBuilder("sh", "-c", cmd);
// Prevent hive configurations from being visible in Spark.
pb.environment().remove("HIVE_HOME");
pb.environment().remove("HIVE_CONF_DIR");
// Add credential provider password to the child process's environment
// In case of Spark the credential provider location is provided in the jobConf when the job is submitted
String password = getSparkJobCredentialProviderPassword();
if(password != null) {
pb.environment().put(Constants.HADOOP_CREDENTIAL_PASSWORD_ENVVAR, password);
}
if (isTesting != null) {
pb.environment().put("SPARK_TESTING", isTesting);
}
final Process child = pb.start();
int childId = childIdGenerator.incrementAndGet();
final List childErrorLog = new ArrayList();
redirect("stdout-redir-" + childId, new Redirector(child.getInputStream()));
redirect("stderr-redir-" + childId, new Redirector(child.getErrorStream(), childErrorLog));
runnable = new Runnable() {
@Override
public void run() {
try {
int exitCode = child.waitFor();
if (exitCode != 0) {
StringBuilder errStr = new StringBuilder();
for (String s : childErrorLog) {
errStr.append(s);
errStr.append('\n');
}
rpcServer.cancelClient(clientId,
"Child process exited before connecting back with error log " + errStr.toString());
LOG.warn("Child process exited with code {}", exitCode);
}
} catch (InterruptedException ie) {
LOG.warn("Waiting thread interrupted, killing child process.");
Thread.interrupted();
child.destroy();
} catch (Exception e) {
LOG.warn("Exception while waiting for child process.", e);
}
}
};
}
Thread thread = new Thread(runnable);
thread.setDaemon(true);
thread.setName("Driver");
thread.start();
return thread;
}
private String getSparkJobCredentialProviderPassword() {
if (conf.containsKey("spark.yarn.appMasterEnv.HADOOP_CREDSTORE_PASSWORD")) {
return conf.get("spark.yarn.appMasterEnv.HADOOP_CREDSTORE_PASSWORD");
} else if (conf.containsKey("spark.executorEnv.HADOOP_CREDSTORE_PASSWORD")) {
return conf.get("spark.executorEnv.HADOOP_CREDSTORE_PASSWORD");
}
return null;
}
private void redirect(String name, Redirector redirector) {
Thread thread = new Thread(redirector);
thread.setName(name);
thread.setDaemon(true);
thread.start();
}
private class ClientProtocol extends BaseProtocol {
JobHandleImpl submit(Job job, List> listeners) {
final String jobId = UUID.randomUUID().toString();
final Promise promise = driverRpc.createPromise();
final JobHandleImpl handle =
new JobHandleImpl(SparkClientImpl.this, promise, jobId, listeners);
jobs.put(jobId, handle);
final io.netty.util.concurrent.Future rpc = driverRpc.call(new JobRequest(jobId, job));
LOG.debug("Send JobRequest[{}].", jobId);
// Link the RPC and the promise so that events from one are propagated to the other as
// needed.
rpc.addListener(new GenericFutureListener>() {
@Override
public void operationComplete(io.netty.util.concurrent.Future f) {
if (f.isSuccess()) {
// If the spark job finishes before this listener is called, the QUEUED status will not be set
handle.changeState(JobHandle.State.QUEUED);
} else if (!promise.isDone()) {
promise.setFailure(f.cause());
}
}
});
promise.addListener(new GenericFutureListener>() {
@Override
public void operationComplete(Promise p) {
if (jobId != null) {
jobs.remove(jobId);
}
if (p.isCancelled() && !rpc.isDone()) {
rpc.cancel(true);
}
}
});
return handle;
}
Future run(Job job) {
@SuppressWarnings("unchecked")
final io.netty.util.concurrent.Future rpc = (io.netty.util.concurrent.Future)
driverRpc.call(new SyncJobRequest(job), Serializable.class);
return rpc;
}
void cancel(String jobId) {
driverRpc.call(new CancelJob(jobId));
}
Future endSession() {
return driverRpc.call(new EndSession());
}
private void handle(ChannelHandlerContext ctx, Error msg) {
LOG.warn("Error reported from remote driver.", msg.cause);
}
private void handle(ChannelHandlerContext ctx, JobMetrics msg) {
JobHandleImpl handle = jobs.get(msg.jobId);
if (handle != null) {
handle.getMetrics().addMetrics(msg.sparkJobId, msg.stageId, msg.taskId, msg.metrics);
} else {
LOG.warn("Received metrics for unknown job {}", msg.jobId);
}
}
private void handle(ChannelHandlerContext ctx, JobResult msg) {
JobHandleImpl handle = jobs.remove(msg.id);
if (handle != null) {
LOG.info("Received result for {}", msg.id);
handle.setSparkCounters(msg.sparkCounters);
Throwable error = msg.error != null ? new SparkException(msg.error) : null;
if (error == null) {
handle.setSuccess(msg.result);
} else {
handle.setFailure(error);
}
} else {
LOG.warn("Received result for unknown job {}", msg.id);
}
}
private void handle(ChannelHandlerContext ctx, JobStarted msg) {
JobHandleImpl handle = jobs.get(msg.id);
if (handle != null) {
handle.changeState(JobHandle.State.STARTED);
} else {
LOG.warn("Received event for unknown job {}", msg.id);
}
}
private void handle(ChannelHandlerContext ctx, JobSubmitted msg) {
JobHandleImpl handle = jobs.get(msg.clientJobId);
if (handle != null) {
LOG.info("Received spark job ID: {} for {}", msg.sparkJobId, msg.clientJobId);
handle.addSparkJobId(msg.sparkJobId);
} else {
LOG.warn("Received spark job ID: {} for unknown job {}", msg.sparkJobId, msg.clientJobId);
}
}
}
private class Redirector implements Runnable {
private final BufferedReader in;
private List errLogs;
private int numErrLogLines = 0;
Redirector(InputStream in) {
this.in = new BufferedReader(new InputStreamReader(in));
}
Redirector(InputStream in, List errLogs) {
this.in = new BufferedReader(new InputStreamReader(in));
this.errLogs = errLogs;
}
@Override
public void run() {
try {
String line = null;
while ((line = in.readLine()) != null) {
LOG.info(line);
if (errLogs != null) {
if (numErrLogLines++ < MAX_ERR_LOG_LINES_FOR_RPC) {
errLogs.add(line);
}
}
}
} catch (IOException e) {
if (isAlive) {
LOG.warn("I/O error in redirector thread.", e);
} else {
// When stopping the remote driver the process might be destroyed during reading from the stream.
// We should not log the related exceptions in a visible level as they might mislead the user.
LOG.debug("I/O error in redirector thread while stopping the remote driver", e);
}
} catch (Exception e) {
LOG.warn("Error in redirector thread.", e);
}
}
}
private static class AddJarJob implements Job {
private static final long serialVersionUID = 1L;
private final String path;
AddJarJob() {
this(null);
}
AddJarJob(String path) {
this.path = path;
}
@Override
public Serializable call(JobContext jc) throws Exception {
jc.sc().addJar(path);
// Following remote job may refer to classes in this jar, and the remote job would be executed
// in a different thread, so we add this jar path to JobContext for further usage.
jc.getAddedJars().put(path, System.currentTimeMillis());
return null;
}
}
private static class AddFileJob implements Job {
private static final long serialVersionUID = 1L;
private final String path;
AddFileJob() {
this(null);
}
AddFileJob(String path) {
this.path = path;
}
@Override
public Serializable call(JobContext jc) throws Exception {
jc.sc().addFile(path);
return null;
}
}
private static class GetExecutorCountJob implements Job {
private static final long serialVersionUID = 1L;
@Override
public Integer call(JobContext jc) throws Exception {
// minus 1 here otherwise driver is also counted as an executor
int count = jc.sc().sc().getExecutorMemoryStatus().size() - 1;
return Integer.valueOf(count);
}
}
private static class GetDefaultParallelismJob implements Job {
private static final long serialVersionUID = 1L;
@Override
public Integer call(JobContext jc) throws Exception {
return jc.sc().sc().defaultParallelism();
}
}
}
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