[jira] [Created] (FLINK-3446) Back pressure tracker throws NPE for archived jobs

["Ufuk Celebi (JIRA)" <ji...@apache.org>]

Ufuk Celebi created FLINK-3446:
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             Summary: Back pressure tracker throws NPE for archived jobs 
                 Key: FLINK-3446
                 URL: https://issues.apache.org/jira/browse/FLINK-3446
             Project: Flink
          Issue Type: Bug
          Components: Webfrontend
            Reporter: Ufuk Celebi
            Assignee: Ufuk Celebi


After a job is archived the execution context of the {{ExecutionGraph}} is {{null}}. When triggering a new back pressure sample in parallel, this can result in a {{NullPointerException}} in the web frontend. This does not break anything, but pollutes the log.

{code}
2016-02-18 20:17:49,071 ERROR org.apache.flink.runtime.webmonitor.BackPressureStatsTracker  - Failed to gather stack trace sample.
java.lang.RuntimeException: Discarded
	at org.apache.flink.runtime.webmonitor.StackTraceSampleCoordinator$PendingStackTraceSample.discard(StackTraceSampleCoordinator.java:394)
	at org.apache.flink.runtime.webmonitor.StackTraceSampleCoordinator$1.run(StackTraceSampleCoordinator.java:181)
	at java.util.TimerThread.mainLoop(Timer.java:555)
	at java.util.TimerThread.run(Timer.java:505)
Caused by: java.lang.RuntimeException: Time out
	... 3 more
2016-02-18 20:17:50,088 WARN  org.apache.flink.runtime.webmonitor.RuntimeMonitorHandler     - Error while handling request
java.lang.NullPointerException
	at scala.concurrent.impl.Promise$DefaultPromise.onComplete(Promise.scala:268)
	at org.apache.flink.runtime.webmonitor.BackPressureStatsTracker.triggerStackTraceSample(BackPressureStatsTracker.java:170)
	at org.apache.flink.runtime.webmonitor.handlers.JobVertexBackPressureHandler.handleRequest(JobVertexBackPressureHandler.java:98)
	at org.apache.flink.runtime.webmonitor.handlers.AbstractJobVertexRequestHandler.handleRequest(AbstractJobVertexRequestHandler.java:58)
	at org.apache.flink.runtime.webmonitor.handlers.AbstractExecutionGraphRequestHandler.handleRequest(AbstractExecutionGraphRequestHandler.java:61)
	at org.apache.flink.runtime.webmonitor.RuntimeMonitorHandler.respondAsLeader(RuntimeMonitorHandler.java:135)
	at org.apache.flink.runtime.webmonitor.RuntimeMonitorHandler.channelRead0(RuntimeMonitorHandler.java:112)
	at org.apache.flink.runtime.webmonitor.RuntimeMonitorHandler.channelRead0(RuntimeMonitorHandler.java:60)
	at io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:105)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:339)
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:324)
	at io.netty.handler.codec.http.router.Handler.routed(Handler.java:62)
	at io.netty.handler.codec.http.router.DualAbstractHandler.channelRead0(DualAbstractHandler.java:57)
	at io.netty.handler.codec.http.router.DualAbstractHandler.channelRead0(DualAbstractHandler.java:20)
	at io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:105)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:339)
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:324)
	at org.apache.flink.runtime.webmonitor.HttpRequestHandler.channelRead0(HttpRequestHandler.java:104)
	at org.apache.flink.runtime.webmonitor.HttpRequestHandler.channelRead0(HttpRequestHandler.java:65)
	at io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:105)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:339)
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:324)
	at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:242)
	at io.netty.channel.CombinedChannelDuplexHandler.channelRead(CombinedChannelDuplexHandler.java:147)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:339)
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:324)
	at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:847)
	at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:131)
	at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:511)
	at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:468)
	at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:382)
	at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:354)
	at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:111)
	at io.netty.util.concurrent.DefaultThreadFactory$DefaultRunnableDecorator.run(DefaultThreadFactory.java:137)
	at java.lang.Thread.run(Thread.java:745)
{code}



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