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https://issues.apache.org/jira/browse/USERGRID-439?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15093114#comment-15093114
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Michael Russo commented on USERGRID-439:
----------------------------------------
This is actually not an error case if the server cannot get a lock on the queue
jobs. It could happen in a valid scenario. The log statement has already been
switched to debug in master branch.
> Scheduler run failed when system idling
> ---------------------------------------
>
> Key: USERGRID-439
> URL: https://issues.apache.org/jira/browse/USERGRID-439
> Project: Usergrid
> Issue Type: Bug
> Components: Stack
> Reporter: Jeffrey
> Assignee: Michael Russo
> Priority: Minor
>
> This error happens consistently in some clusters when the system is largely
> idle:
> 2015-02-27 23:19:40,060 [JobSchedulerService] ERROR
> org.apache.usergrid.batch.service.JobSchedulerService- Scheduler run failed,
> error is
> org.apache.usergrid.persistence.exceptions.QueueException: Unable to obtain a
> lock on queue '/jobs' after '5'seconds
> at
> org.apache.usergrid.mq.cassandra.io.ConsumerTransaction.getResults(ConsumerTransaction.java:206)
> at
> org.apache.usergrid.mq.cassandra.QueueManagerImpl.getFromQueue(QueueManagerImpl.java:412)
> at
> org.apache.usergrid.batch.service.SchedulerServiceImpl.getJobs(SchedulerServiceImpl.java:164)
> at
> org.apache.usergrid.batch.service.JobSchedulerService.runOneIteration(JobSchedulerService.java:111)
> at
> com.google.common.util.concurrent.AbstractScheduledService$1$1.run(AbstractScheduledService.java:170)
> at
> java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
> at
> java.util.concurrent.FutureTask$Sync.innerRunAndReset(FutureTask.java:351)
> at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:178)
> at
> java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:178)
> at
> java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
> 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:722)
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