[ 
https://issues.apache.org/jira/browse/YARN-4530?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15075106#comment-15075106
 ] 

tangshangwen commented on YARN-4530:
------------------------------------

when the assoc is null and the completed.get() throw a ExecutionException´╝îThis 
will happen, right´╝č
{code:title=ResourceLocalizationService.java|borderStyle=solid}
try {
            Future<Path> completed = queue.take();
            LocalizerResourceRequestEvent assoc = pending.remove(completed);
            try {
              Path local = completed.get();
              if (null == assoc) {
                LOG.error("Localized unkonwn resource to " + completed);
                // TODO delete
                return;
              }
              LocalResourceRequest key = assoc.getResource().getRequest();
              publicRsrc.handle(new ResourceLocalizedEvent(key, local, FileUtil
                .getDU(new File(local.toUri()))));
              assoc.getResource().unlock();
            } catch (ExecutionException e) {
              LOG.info("Failed to download rsrc " + assoc.getResource(),
                  e.getCause());
              LocalResourceRequest req = assoc.getResource().getRequest();
              publicRsrc.handle(new ResourceFailedLocalizationEvent(req,
                  e.getMessage()));
              assoc.getResource().unlock();
            } catch (CancellationException e) {
              // ignore; shutting down
            }
{code}

> LocalizedResource trigger a NPE Cause the NodeManager exit
> ----------------------------------------------------------
>
>                 Key: YARN-4530
>                 URL: https://issues.apache.org/jira/browse/YARN-4530
>             Project: Hadoop YARN
>          Issue Type: Bug
>    Affects Versions: 2.2.0
>            Reporter: tangshangwen
>
> In our cluster, I found that LocalizedResource download failed trigger a NPE 
> Cause the NodeManager shutdown.
> {noformat}
> 2015-12-29 17:18:33,706 INFO 
> org.apache.hadoop.yarn.server.nodemanager.containermanager.localizer.LocalizedResource:
>  Resource 
> hdfs://ns3:8020/user/username/projects/user_insight/lookalike/oozie/workflow/conf/hive-site.xml
>  transitioned from DOWNLOADING to FAILED
> 2015-12-29 17:18:33,708 INFO 
> org.apache.hadoop.yarn.server.nodemanager.containermanager.localizer.ResourceLocalizationService:
>  Downloading public rsrc:{ 
> hdfs://ns3/user/username/projects/user_insight/lookalike/oozie/workflow/lib/user_insight_pig_udf-0.0.1-SNAPSHOT-jar-with-dependencies.jar,
>  1451380519635, FILE, null }
> 2015-12-29 17:18:33,710 INFO 
> org.apache.hadoop.yarn.server.nodemanager.containermanager.localizer.ResourceLocalizationService:
>  Failed to download rsrc { { 
> hdfs://ns3/user/username/projects/user_insight/lookalike/oozie/workflow/lib/unilever_support_udf-0.0.1-SNAPSHOT.jar,
>  1451380519452, FILE, null 
> },pending,[(container_1451039893865_261670_01_000578)],42332661980495938,DOWNLOADING}
> java.io.IOException: Resource 
> hdfs://ns3/user/username/projects/user_insight/lookalike/oozie/workflow/lib/unilever_support_udf-0.0.1-SNAPSHOT.jar
>  changed on src filesystem (expected 1451380519452, was 1451380611793
>       at org.apache.hadoop.yarn.util.FSDownload.copy(FSDownload.java:176)
>       at org.apache.hadoop.yarn.util.FSDownload.call(FSDownload.java:276)
>       at org.apache.hadoop.yarn.util.FSDownload.call(FSDownload.java:50)
>       at java.util.concurrent.FutureTask.run(FutureTask.java:262)
>       at 
> java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
>       at java.util.concurrent.FutureTask.run(FutureTask.java:262)
>       at 
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
>       at 
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
>       at java.lang.Thread.run(Thread.java:745)
> 2015-12-29 17:18:33,710 INFO 
> org.apache.hadoop.yarn.server.nodemanager.containermanager.localizer.LocalizedResource:
>  Resource 
> hdfs://ns3/user/username/projects/user_insight/lookalike/oozie/workflow/lib/unilever_support_udf-0.0.1-SNAPSHOT.jar
>  transitioned from DOWNLOADING to FAILED
> 2015-12-29 17:18:33,710 FATAL 
> org.apache.hadoop.yarn.server.nodemanager.containermanager.localizer.ResourceLocalizationService:
>  Error: Shutting down
> java.lang.NullPointerException at 
> org.apache.hadoop.yarn.server.nodemanager.containermanager.localizer.ResourceLocalizationService$PublicLocalizer.run(ResourceLocalizationService.java:712)
> 2015-12-29 17:18:33,710 INFO 
> org.apache.hadoop.yarn.server.nodemanager.containermanager.localizer.ResourceLocalizationService:
>  Public cache exiting
> {noformat}



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