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| package test;
import org.apache.commons.lang.StringUtils;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileContext;
import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.fs.RemoteIterator;
import org.apache.hadoop.security.UserGroupInformation;
import org.apache.hadoop.yarn.api.records.ApplicationId;
import org.apache.hadoop.yarn.api.records.ApplicationReport;
import org.apache.hadoop.yarn.client.api.YarnClient;
import org.apache.hadoop.yarn.conf.YarnConfiguration;
import org.apache.hadoop.yarn.exceptions.YarnException;
import org.apache.hadoop.yarn.logaggregation.AggregatedLogFormat;
import org.apache.hadoop.yarn.logaggregation.LogAggregationUtils;
import org.apache.hadoop.yarn.util.Times;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.DataInputStream;
import java.io.EOFException;
import java.io.FileNotFoundException;
import java.io.IOException;
public class GetLogTask {
private static Logger logger = LoggerFactory.getLogger(GetLogTask.class);
public String getLog(ApplicationId appId, String appOwner, Configuration conf) throws Exception {
checkLogAggregationEnable(conf);
int resultCode = verifyApplicationState(appId, conf);
if (resultCode != 0) {
throw new Exception("Application has not completed." +
" Logs are only available after an application completes");
}
if (appOwner == null || appOwner.isEmpty()) {
appOwner = UserGroupInformation.getCurrentUser().getShortUserName();
}
return dumpAllContainersLogs(appId, appOwner, conf);
}
private String dumpAllContainersLogs(ApplicationId appId, String appOwner, Configuration conf) throws
Exception {
StringBuilder output = new StringBuilder();
Path remoteRootLogDir = new Path(conf.get(
YarnConfiguration.NM_REMOTE_APP_LOG_DIR,
YarnConfiguration.DEFAULT_NM_REMOTE_APP_LOG_DIR));
String logDirSuffix = LogAggregationUtils.getRemoteNodeLogDirSuffix(conf);
Path remoteAppLogDir = LogAggregationUtils.getRemoteAppLogDir(
remoteRootLogDir, appId, appOwner, logDirSuffix);
RemoteIterator<FileStatus> nodeFiles = null;
try {
Path qualifiedLogDir = FileContext.getFileContext(conf).makeQualified(remoteAppLogDir);
nodeFiles = FileContext.getFileContext(qualifiedLogDir.toUri(), conf).listStatus(remoteAppLogDir);
} catch (FileNotFoundException fnf) {
logDirNotExist(remoteAppLogDir.toString());
}
boolean foundAnyLogs = false;
assert nodeFiles != null;
while (nodeFiles.hasNext()) {
FileStatus thisNodeFile = nodeFiles.next();
if (!thisNodeFile.getPath().getName().endsWith(LogAggregationUtils.TMP_FILE_SUFFIX)) {
AggregatedLogFormat.LogReader reader = new AggregatedLogFormat.LogReader(conf, thisNodeFile.getPath());
try {
DataInputStream valueStream;
AggregatedLogFormat.LogKey key = new AggregatedLogFormat.LogKey();
valueStream = reader.next(key);
while (valueStream != null) {
String containerString = "\n\nContainer: " + key + " on " + thisNodeFile.getPath().getName();
output.append(containerString).append("\n");
output.append(StringUtils.repeat("=", containerString.length())).append("\n");
while (true) {
try {
readContainerLogs(valueStream, output, thisNodeFile.getModificationTime());
foundAnyLogs = true;
} catch (EOFException eof) {
break;
}
}
key = new AggregatedLogFormat.LogKey();
valueStream = reader.next(key);
}
} finally {
reader.close();
}
}
}
if (!foundAnyLogs) {
emptyLogDir(remoteAppLogDir.toString());
}
return output.toString();
}
private int verifyApplicationState(ApplicationId appId, Configuration conf) throws IOException,
YarnException {
YarnClient yarnClient = null;
try {
yarnClient = YarnClient.createYarnClient();
yarnClient.init(conf);
yarnClient.start();
ApplicationReport appReport = yarnClient.getApplicationReport(appId);
switch (appReport.getYarnApplicationState()) {
case NEW:
case NEW_SAVING:
case ACCEPTED:
case SUBMITTED:
case RUNNING:
return -1;
case FAILED:
case FINISHED:
case KILLED:
default:
break;
}
} finally {
if (yarnClient != null) {
yarnClient.close();
}
}
return 0;
}
private void logDirNotExist(String remoteAppLogDir) throws Exception {
throw new FileNotFoundException(remoteAppLogDir + " does not exist.\n" + "Log aggregation has not completed " +
"or is not " + "enabled.");
}
private void emptyLogDir(String remoteAppLogDir) throws Exception {
logger.warn(remoteAppLogDir + " does not have any log files.");
}
private void readContainerLogs(DataInputStream valueStream,
StringBuilder out, long logUploadedTime) throws IOException {
byte[] buf = new byte[65535];
String fileType = valueStream.readUTF();
String fileLengthStr = valueStream.readUTF();
long fileLength = Long.parseLong(fileLengthStr);
out.append("ContainerLog-start ").append(StringUtils.repeat("-", 80)).append("\n");
out.append("LogType:").append(fileType).append("\n");
if (logUploadedTime != -1) {
out.append("Log Upload Time:").append(Times.format(logUploadedTime)).append("\n");
}
out.append("LogLength:");
out.append(fileLengthStr).append("\n\n");
out.append("Log Contents:").append("\n");
long curRead = 0;
long pendingRead = fileLength - curRead;
int toRead = pendingRead > buf.length ? buf.length : (int) pendingRead;
int len = valueStream.read(buf, 0, toRead);
while (len != -1 && curRead < fileLength) {
out.append(new String(buf, 0, len));
curRead += len;
pendingRead = fileLength - curRead;
toRead =
pendingRead > buf.length ? buf.length : (int) pendingRead;
len = valueStream.read(buf, 0, toRead);
}
out.append("End of LogType:").append(fileType).append("\n");
out.append("").append("\n");
}
private void checkLogAggregationEnable(Configuration conf) throws Exception {
String isEnable = conf.get(YarnConfiguration.LOG_AGGREGATION_ENABLED);
if (!"true".equalsIgnoreCase(isEnable)) {
throw new Exception("LOG_AGGREGATION_ENABLED must be ENABLED");
}
}
}
|