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}
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