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https://issues.apache.org/jira/browse/FLUME-1124?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Brock Noland updated FLUME-1124:
--------------------------------
Resolution: Fixed
Status: Resolved (was: Patch Available)
Committed in 1327622. Thank you for your patch Hari!
> Lifecycle supervisor can cause thread contention, sometimes causing
> components to not startup.
> ----------------------------------------------------------------------------------------------
>
> Key: FLUME-1124
> URL: https://issues.apache.org/jira/browse/FLUME-1124
> Project: Flume
> Issue Type: Bug
> Components: Sinks+Sources
> Affects Versions: v1.1.0
> Reporter: Hari Shreedharan
> Assignee: Hari Shreedharan
> Fix For: v1.2.0
>
> Attachments: FLUME-1124-1.patch, FLUME-1124-3.patch
>
>
> Based on Brock's review of my patch, the following issues have been added to
> this jira:
> This isn't your code but it looks like there are a few problems here.
> 1) monitorService on MonitorRunnable is not set so an NPE (which is not being
> logged is thrown:
> java.lang.NullPointerException
> at
> org.apache.flume.lifecycle.LifecycleSupervisor$MonitorRunnable.run(LifecycleSupervisor.java:255)
> at
> java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
> at
> java.util.concurrent.FutureTask$Sync.innerRunAndReset(FutureTask.java:317)
> at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:150)
> at
> java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$101(ScheduledThreadPoolExecutor.java:98)
> at
> java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.runPeriodic(ScheduledThreadPoolExecutor.java:180)
> at
> java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:204)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
> at java.lang.Thread.run(Thread.java:662)
> 2) The NPE is not being logged.
> 3) If the NPE did not occur we'd have a bigger issue as scheduleAtFixedRate
> is called here but the runnable reschedules itself.
> 4) Calling first supervise() and then start() creates two threads monitoring
> this service.
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