diff --git a/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 b/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 index 0b599a873f..4b4c2293f1 100644 --- a/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 +++ b/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 @@ -562,9 +562,23 @@ protected void handleContainerExitWithFailure(ContainerId containerID, 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"); + if (tailBufferMsg.indexOf("Error: Could not find or load main class org.apache.hadoop.mapreduce") != -1) { + diagnosticInfo.append("Please check whether your etc/hadoop/mapred-site.xml contains the below configuration:\n"); + diagnosticInfo.append("\n") + .append(" yarn.app.mapreduce.am.env\n") + .append(" HADOOP_MAPRED_HOME=${full path of your hadoop distribution directory}\n") + .append("\n\n") + .append(" mapreduce.map.env\n") + .append(" HADOOP_MAPRED_HOME=${full path of your hadoop distribution directory}\n") + .append("\n\n") + .append(" mapreduce.reduce.env\n") + .append(" HADOOP_MAPRED_HOME=${full path of your hadoop distribution directory}\n") + .append("\n"); + } } } catch (IOException e) { LOG.error("Failed to get tail of the container's error log file", e);