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https://issues.apache.org/jira/browse/HAMA-583?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13284230#comment-13284230
]
Thomas Jungblut edited comment on HAMA-583 at 5/28/12 6:02 AM:
---------------------------------------------------------------
This
{noformat}
2012-05-27 20:25:28,916 ERROR org.apache.hama.bsp.SimpleTaskScheduler: Error
submitting job
java.util.concurrent.ExecutionException: java.lang.NullPointerException
at java.util.concurrent.FutureTask$Sync.innerGet(FutureTask.java:252)
at java.util.concurrent.FutureTask.get(FutureTask.java:111)
at
org.apache.hama.bsp.SimpleTaskScheduler$JobProcessor.schedule(SimpleTaskScheduler.java:141)
at
org.apache.hama.bsp.SimpleTaskScheduler$JobProcessor.run(SimpleTaskScheduler.java:116)
Caused by: java.lang.NullPointerException
at
org.apache.hama.bsp.TaskInProgress.getTaskToRun(TaskInProgress.java:149)
at
org.apache.hama.bsp.JobInProgress.obtainNewTask(JobInProgress.java:268)
at
org.apache.hama.bsp.SimpleTaskScheduler$TaskWorker.call(SimpleTaskScheduler.java:191)
at
org.apache.hama.bsp.SimpleTaskScheduler$TaskWorker.call(SimpleTaskScheduler.java:160)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
at java.util.concurrent.FutureTask.run(FutureTask.java:166)
at
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$101(ScheduledThreadPoolExecutor.java:165)
at
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:266)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
at java.lang.Thread.run(Thread.java:679)
{noformat}
happens if the grooms are not correctly configured.
{noformat}
#TaskInProgress->line 145
String location = possibleLocations[i];
GroomServerStatus groom = grooms.get(location);
{noformat}
This checks the given DFS location, if it does not match the groom it will
throw these NPEs.
We should throw a better exception here.
Example
{noformat}
2012-05-27 20:57:15,723 INFO org.apache.hama.bsp.TaskInProgress: GROOMS:
{ip-10-xxx-73-25.eu-west-1.compute.internal=org.apache.hama.bsp.GroomServerStatus@74243402,
ip-10-xxx-166-9.eu-west-1.compute.internal=org.apache.hama.bsp.GroomServerStatus@2883f70a,
ip-10-xxx-97-203.eu-west-1.compute.internal=org.apache.hama.bsp.GroomServerStatus@775898e8,
ip-10-xxx-129-154.eu-west-1.compute.internal=org.apache.hama.bsp.GroomServerStatus@a732038d}
2012-05-27 20:57:15,723 INFO org.apache.hama.bsp.TaskInProgress: LOCATION:
10.xxx.166.9
2012-05-27 20:57:15,723 INFO org.apache.hama.bsp.TaskInProgress: LOCATION:
10.xxx.73.25
2012-05-27 20:57:15,723 INFO org.apache.hama.bsp.TaskInProgress: LOCATION:
10.xxx.97.203
{noformat}
and it can't find the location by the splits in the groom map.
I believe this is because the datanode is not doing a reverse DNS anymore
instead it takes just the hostname of the machine configured in /etc/hostname.
was (Author: thomas.jungblut):
This
{noformat}
2012-05-27 20:25:28,916 ERROR org.apache.hama.bsp.SimpleTaskScheduler: Error
submitting job
java.util.concurrent.ExecutionException: java.lang.NullPointerException
at java.util.concurrent.FutureTask$Sync.innerGet(FutureTask.java:252)
at java.util.concurrent.FutureTask.get(FutureTask.java:111)
at
org.apache.hama.bsp.SimpleTaskScheduler$JobProcessor.schedule(SimpleTaskScheduler.java:141)
at
org.apache.hama.bsp.SimpleTaskScheduler$JobProcessor.run(SimpleTaskScheduler.java:116)
Caused by: java.lang.NullPointerException
at
org.apache.hama.bsp.TaskInProgress.getTaskToRun(TaskInProgress.java:149)
at
org.apache.hama.bsp.JobInProgress.obtainNewTask(JobInProgress.java:268)
at
org.apache.hama.bsp.SimpleTaskScheduler$TaskWorker.call(SimpleTaskScheduler.java:191)
at
org.apache.hama.bsp.SimpleTaskScheduler$TaskWorker.call(SimpleTaskScheduler.java:160)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
at java.util.concurrent.FutureTask.run(FutureTask.java:166)
at
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$101(ScheduledThreadPoolExecutor.java:165)
at
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:266)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
at java.lang.Thread.run(Thread.java:679)
{noformat}
happens if the grooms are not correctly configured.
{{{
#TaskInProgress->line 145
String location = possibleLocations[i];
GroomServerStatus groom = grooms.get(location);
}}}
This checks the given DFS location, if it does not match the groom it will
throw these NPEs.
We should throw a better exception here.
Actually we shouldn't do a reverse DNS in our groom hostnames, just use the
configured ones in /etc/hostname just like the datanode does. So this won't
give inconsistencies.
> Misc release tasks
> ------------------
>
> Key: HAMA-583
> URL: https://issues.apache.org/jira/browse/HAMA-583
> Project: Hama
> Issue Type: Improvement
> Components: build
> Affects Versions: 0.5.0
> Reporter: Thomas Jungblut
> Priority: Blocker
> Fix For: 0.5.0
>
>
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