/*
* Copyright 2012 LinkedIn Corp.
*
* Licensed 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 azkaban.jobExecutor;
import java.io.File;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.concurrent.TimeUnit;
import org.apache.log4j.Logger;
import azkaban.flow.CommonJobProperties;
import azkaban.jobExecutor.utils.process.AzkabanProcess;
import azkaban.jobExecutor.utils.process.AzkabanProcessBuilder;
import azkaban.utils.Pair;
import azkaban.utils.Props;
import azkaban.utils.SystemMemoryInfo;
/**
* A job that runs a simple unix command
*/
public class ProcessJob extends AbstractProcessJob {
public static final String COMMAND = "command";
private static final long KILL_TIME_MS = 5000;
private volatile AzkabanProcess process;
private static final String MEMCHECK_ENABLED = "memCheck.enabled";
private static final String MEMCHECK_FREEMEMDECRAMT =
"memCheck.freeMemDecrAmt";
public static final String AZKABAN_MEMORY_CHECK = "azkaban.memory.check";
public static final String NATIVE_LIB_FOLDER = "azkaban.native.lib";
public static final String EXECUTE_AS_USER = "execute.as.user";
public static final String USER_TO_PROXY = "user.to.proxy";
public static final String KRB5CCNAME = "KRB5CCNAME";
public ProcessJob(final String jobId, final Props sysProps,
final Props jobProps, final Logger log) {
super(jobId, sysProps, jobProps, log);
// this is in line with what other job types (hadoopJava, spark, pig, hive)
// is doing
jobProps.put(CommonJobProperties.JOB_ID, jobId);
}
@Override
public void run() throws Exception {
try {
resolveProps();
} catch (Exception e) {
handleError("Bad property definition! " + e.getMessage(), e);
}
if (sysProps.getBoolean(MEMCHECK_ENABLED, true)
&& jobProps.getBoolean(AZKABAN_MEMORY_CHECK, true)) {
long freeMemDecrAmt = sysProps.getLong(MEMCHECK_FREEMEMDECRAMT, 0);
Pair<Long, Long> memPair = getProcMemoryRequirement();
boolean isMemGranted =
SystemMemoryInfo.canSystemGrantMemory(memPair.getFirst(),
memPair.getSecond(), freeMemDecrAmt);
if (!isMemGranted) {
throw new Exception(
String
.format(
"Cannot request memory (Xms %d kb, Xmx %d kb) from system for job %s",
memPair.getFirst(), memPair.getSecond(), getId()));
}
}
List<String> commands = null;
try {
commands = getCommandList();
} catch (Exception e) {
handleError("Job set up failed " + e.getCause(), e);
}
long startMs = System.currentTimeMillis();
if (commands == null) {
handleError("There are no commands to execute", null);
}
info(commands.size() + " commands to execute.");
File[] propFiles = initPropsFiles();
// change krb5ccname env var so that each job execution gets its own cache
Map<String, String> envVars = getEnvironmentVariables();
envVars.put(KRB5CCNAME, getKrb5ccname(jobProps));
// determine whether to run as Azkaban or run as effectiveUser
String executeAsUserBinaryPath = null;
String effectiveUser = null;
boolean isExecuteAsUser = determineExecuteAsUser(sysProps, jobProps);
if (isExecuteAsUser) {
String nativeLibFolder = sysProps.getString(NATIVE_LIB_FOLDER);
executeAsUserBinaryPath =
String.format("%s/%s", nativeLibFolder, "execute-as-user");
effectiveUser = getEffectiveUser(jobProps);
if ("root".equals(effectiveUser)) {
throw new RuntimeException(
"Not permitted to proxy as root through Azkaban");
}
}
for (String command : commands) {
AzkabanProcessBuilder builder = null;
if (isExecuteAsUser) {
command =
String.format("%s %s %s", executeAsUserBinaryPath, effectiveUser,
command);
info("Command: " + command);
builder =
new AzkabanProcessBuilder(partitionCommandLine(command))
.setEnv(envVars).setWorkingDir(getCwd()).setLogger(getLog())
.enableExecuteAsUser().setExecuteAsUserBinaryPath(executeAsUserBinaryPath)
.setEffectiveUser(effectiveUser);
} else {
info("Command: " + command);
builder =
new AzkabanProcessBuilder(partitionCommandLine(command))
.setEnv(envVars).setWorkingDir(getCwd()).setLogger(getLog());
}
if (builder.getEnv().size() > 0) {
info("Environment variables: " + builder.getEnv());
}
info("Working directory: " + builder.getWorkingDir());
// print out the Job properties to the job log.
this.logJobProperties();
boolean success = false;
this.process = builder.build();
try {
this.process.run();
success = true;
} catch (Throwable e) {
for (File file : propFiles)
if (file != null && file.exists())
file.delete();
throw new RuntimeException(e);
} finally {
this.process = null;
info("Process completed "
+ (success ? "successfully" : "unsuccessfully") + " in "
+ ((System.currentTimeMillis() - startMs) / 1000) + " seconds.");
}
}
// Get the output properties from this job.
generateProperties(propFiles[1]);
}
private boolean determineExecuteAsUser(Props sysProps, Props jobProps) {
return sysProps.getBoolean(EXECUTE_AS_USER, false);
}
/**
* <pre>
* This method extracts the kerberos ticket cache file name from the jobprops.
* This method will ensure that each job execution will have its own kerberos ticket cache file
* Given that the code only sets an environmental variable, the number of files created corresponds
* to the number of processes that are doing kinit in their flow, which should not be an inordinately
* high number.
* </pre>
*
* @return file name: the kerberos ticket cache file to use
*/
private String getKrb5ccname(Props jobProps) {
String effectiveUser = getEffectiveUser(jobProps);
String projectName =
jobProps.getString(CommonJobProperties.PROJECT_NAME).replace(" ", "_");
String flowId =
jobProps.getString(CommonJobProperties.FLOW_ID).replace(" ", "_");
String jobId =
jobProps.getString(CommonJobProperties.JOB_ID).replace(" ", "_");
// execId should be an int and should not have space in it, ever
String execId = jobProps.getString(CommonJobProperties.EXEC_ID);
String krb5ccname =
String.format("/tmp/krb5cc__%s__%s__%s__%s__%s", projectName, flowId,
jobId, execId, effectiveUser);
return krb5ccname;
}
/**
* <pre>
* Determines what user id should the process job run as, in the following order of precedence:
* 1. USER_TO_PROXY
* 2. SUBMIT_USER
* </pre>
*
* @param jobProps
* @return the user that Azkaban is going to execute as
*/
private String getEffectiveUser(Props jobProps) {
String effectiveUser = null;
if (jobProps.containsKey(USER_TO_PROXY)) {
effectiveUser = jobProps.getString(USER_TO_PROXY);
} else if (jobProps.containsKey(CommonJobProperties.SUBMIT_USER)) {
effectiveUser = jobProps.getString(CommonJobProperties.SUBMIT_USER);
} else {
throw new RuntimeException(
"Internal Error: No user.to.proxy or submit.user in the jobProps");
}
info("effective user is: " + effectiveUser);
return effectiveUser;
}
/**
* This is used to get the min/max memory size requirement by processes.
* SystemMemoryInfo can use the info to determine if the memory request can be
* fulfilled. For Java process, this should be Xms/Xmx setting.
*
* @return pair of min/max memory size
*/
protected Pair<Long, Long> getProcMemoryRequirement() throws Exception {
return new Pair<Long, Long>(0L, 0L);
}
protected void handleError(String errorMsg, Exception e) throws Exception {
error(errorMsg);
if (e != null) {
throw new Exception(errorMsg, e);
} else {
throw new Exception(errorMsg);
}
}
protected List<String> getCommandList() {
List<String> commands = new ArrayList<String>();
commands.add(jobProps.getString(COMMAND));
for (int i = 1; jobProps.containsKey(COMMAND + "." + i); i++) {
commands.add(jobProps.getString(COMMAND + "." + i));
}
return commands;
}
@Override
public void cancel() throws InterruptedException {
if (process == null)
throw new IllegalStateException("Not started.");
boolean killed = process.softKill(KILL_TIME_MS, TimeUnit.MILLISECONDS);
if (!killed) {
warn("Kill with signal TERM failed. Killing with KILL signal.");
process.hardKill();
}
}
@Override
public double getProgress() {
return process != null && process.isComplete() ? 1.0 : 0.0;
}
public int getProcessId() {
return process.getProcessId();
}
public String getPath() {
return _jobPath == null ? "" : _jobPath;
}
/**
* Splits the command into a unix like command line structure. Quotes and
* single quotes are treated as nested strings.
*
* @param command
* @return
*/
public static String[] partitionCommandLine(final String command) {
ArrayList<String> commands = new ArrayList<String>();
int index = 0;
StringBuffer buffer = new StringBuffer(command.length());
boolean isApos = false;
boolean isQuote = false;
while (index < command.length()) {
char c = command.charAt(index);
switch (c) {
case ' ':
if (!isQuote && !isApos) {
String arg = buffer.toString();
buffer = new StringBuffer(command.length() - index);
if (arg.length() > 0) {
commands.add(arg);
}
} else {
buffer.append(c);
}
break;
case '\'':
if (!isQuote) {
isApos = !isApos;
} else {
buffer.append(c);
}
break;
case '"':
if (!isApos) {
isQuote = !isQuote;
} else {
buffer.append(c);
}
break;
default:
buffer.append(c);
}
index++;
}
if (buffer.length() > 0) {
String arg = buffer.toString();
commands.add(arg);
}
return commands.toArray(new String[commands.size()]);
}
}