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YARN-6999. Add log about how to solve Error: Could not find or load main class org.apache.hadoop.mapreduce.v2.app.MRAppMaster. (Linlin Zhou via gtcarrera9)

This commit is contained in:
Li Lu 2017-08-25 22:43:25 -07:00
parent b89ffcff36
commit 3bee7046c5
1 changed files with 26 additions and 1 deletions
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27
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/containermanager/launcher/ContainerLaunch.java
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@ -564,9 +564,11 @@ public class ContainerLaunch implements Callable<Integer> {
errorFileIS = fileSystem.open(errorFile);
errorFileIS.readFully(startPosition, tailBuffer);
String tailBufferMsg = new String(tailBuffer, StandardCharsets.UTF_8);
diagnosticInfo.append("Last ").append(tailSizeInBytes)
.append(" bytes of ").append(errorFile.getName()).append(" :\n")
.append(new String(tailBuffer, StandardCharsets.UTF_8));
.append(tailBufferMsg).append("\n")
.append(analysesErrorMsgOfContainerExitWithFailure(tailBufferMsg));
}
} catch (IOException e) {
LOG.error("Failed to get tail of the container's error log file", e);
@ -580,6 +582,29 @@ public class ContainerLaunch implements Callable<Integer> {
diagnosticInfo.toString()));
}
private String analysesErrorMsgOfContainerExitWithFailure(String errorMsg) {
StringBuilder analysis = new StringBuilder();
if (errorMsg.indexOf("Error: Could not find or load main class"
+ " org.apache.hadoop.mapreduce") != -1) {
analysis.append("Please check whether your etc/hadoop/mapred-site.xml "
+ "contains the below configuration:\n");
analysis.append("<property>\n")
.append(" <name>yarn.app.mapreduce.am.env</name>\n")
.append(" <value>HADOOP_MAPRED_HOME=${full path of your hadoop "
+ "distribution directory}</value>\n")
.append("</property>\n<property>\n")
.append(" <name>mapreduce.map.env</name>\n")
.append(" <value>HADOOP_MAPRED_HOME=${full path of your hadoop "
+ "distribution directory}</value>\n")
.append("</property>\n<property>\n")
.append(" <name>mapreduce.reduce.e nv</name>\n")
.append(" <value>HADOOP_MAPRED_HOME=${full path of your hadoop "
+ "distribution directory}</value>\n")
.append("</property>\n");
}
return analysis.toString();
}
protected String getPidFileSubpath(String appIdStr, String containerIdStr) {
return getContainerPrivateDir(appIdStr, containerIdStr) + Path.SEPARATOR
+ String.format(ContainerLaunch.PID_FILE_NAME_FMT, containerIdStr);