Ufuk Celebi created FLINK-3446:
----------------------------------
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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