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From "Chesnay Schepler (JIRA)" <j...@apache.org>
Subject [jira] [Created] (FLINK-12642) OutputBufferPoolUsageGauge can fail with NPE
Date Tue, 28 May 2019 08:08:00 GMT
Chesnay Schepler created FLINK-12642:
----------------------------------------

             Summary: OutputBufferPoolUsageGauge can fail with NPE
                 Key: FLINK-12642
                 URL: https://issues.apache.org/jira/browse/FLINK-12642
             Project: Flink
          Issue Type: Bug
          Components: Runtime / Metrics, Runtime / Network
    Affects Versions: 1.9.0
            Reporter: Chesnay Schepler
             Fix For: 1.9.0


The result partition metrics are initialized before {{ResultPartitiion#setup}} was called.
If a reporter tries to access a {{OutputBufferPoolUsageGauge}} in between it will fail with
an NPE since the bufferpool of the partition is still null.

{code}
2019-05-27 14:49:47,031 WARN  org.apache.flink.runtime.metrics.MetricRegistryImpl        
  - Error while reporting metrics
java.lang.NullPointerException
	at org.apache.flink.runtime.io.network.metrics.OutputBufferPoolUsageGauge.getValue(OutputBufferPoolUsageGauge.java:41)
	at org.apache.flink.runtime.io.network.metrics.OutputBufferPoolUsageGauge.getValue(OutputBufferPoolUsageGauge.java:27)
	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$ReporterTask.run(MetricRegistryImpl.java:436)
	at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:514)
	at java.base/java.util.concurrent.FutureTask.runAndReset(FutureTask.java:305)
	at java.base/java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:300)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
	at java.base/java.lang.Thread.run(Thread.java:844)
{code}



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