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From "Chesnay Schepler (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-12642) OutputBufferPoolUsageGauge can fail with NPE
Date Tue, 28 May 2019 08:09:00 GMT

    [ https://issues.apache.org/jira/browse/FLINK-12642?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16849455#comment-16849455
] 

Chesnay Schepler commented on FLINK-12642:
------------------------------------------

[~zjwang][~azagrebin]

> 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
>            Priority: Critical
>             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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