[jira] [Created] (FLINK-14780) Avoid leaking instance of DefaultScheduler before object is constructed

[Shang Yuanchun (Jira)]

Gary Yao created FLINK-14780:
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             Summary: Avoid leaking instance of DefaultScheduler before object is constructed
                 Key: FLINK-14780
                 URL: https://issues.apache.org/jira/browse/FLINK-14780
             Project: Flink
          Issue Type: Sub-task
          Components: Runtime / Coordination
    Affects Versions: 1.10.0
            Reporter: Gary Yao
             Fix For: 1.10.0


An instance of {{DefaultScheduler}} may leak to a metric reporter thread before the instance of the object is fully constructed. This can lead to an NPE (see below.

https://api.travis-ci.org/v3/job/611597698/log.txt

{noformat}
java.lang.NullPointerException
        at org.apache.flink.runtime.scheduler.DefaultScheduler.getNumberOfRestarts(DefaultScheduler.java:156)
        at org.apache.flink.metrics.slf4j.Slf4jReporter.tryReport(Slf4jReporter.java:114)
        at org.apache.flink.metrics.slf4j.Slf4jReporter.report(Slf4jReporter.java:80)
        at org.apache.flink.runtime.metrics.MetricRegistryImpl$ReporterTask.run(MetricRegistryImpl.java:436)
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
        at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:748)
{noformat}



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