lujie created YARN-9226: --------------------------- Summary: NPE while YarnChild shudown Key: YARN-9226 URL: https://issues.apache.org/jira/browse/YARN-9226 Project: Hadoop YARN Issue Type: Bug Reporter: lujie
In YarnChild.main {code:java} try{ logSyncer = TaskLog.createLogSyncer();//line 168 .... taskFinal.run(job, umbilical); //line 178 }catch (Exception exception) {//line 187 LOG.warn("Exception running child : " + StringUtils.stringifyException(exception)); ................. task.taskCleanup(umbilical);// line 200 }{code} At line 178. it will initialize the task.committer, but the line168 may throw exception, it will skip initialize the task.committer, hence task.committer == null. Line 187 will catch this exception and do clean up(line 200), code line 200 will use task.committer without null check, hence NPE happens {code:java} 2019-01-23 16:59:42,864 INFO [main] org.apache.hadoop.mapred.YarnChild: Exception cleaning up: java.lang.NullPointerException at org.apache.hadoop.mapred.Task.taskCleanup(Task.java:1458) at org.apache.hadoop.mapred.YarnChild$3.run(YarnChild.java:200) at java.security.AccessController.doPrivileged(Native Method) at javax.security.auth.Subject.doAs(Subject.java:422) at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1876) at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:197) {code} So why line168 may throw exception, below log give a example: {code:java} 2019-01-23 16:59:42,857 WARN [main] org.apache.hadoop.mapred.YarnChild: Exception running child : java.lang.IllegalStateException: Shutdown in progress, cannot add a shutdownHook at org.apache.hadoop.util.ShutdownHookManager.addShutdownHook(ShutdownHookManager.java:299) at org.apache.hadoop.mapred.TaskLog.createLogSyncer(TaskLog.java:340) at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:168) {code} -- This message was sent by Atlassian JIRA (v7.6.3#76005) --------------------------------------------------------------------- To unsubscribe, e-mail: yarn-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: yarn-issues-h...@hadoop.apache.org