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From Bikas Saha <bi...@hortonworks.com>
Subject RE: Problem with large job on Flink-on-Tez application
Date Thu, 08 Jan 2015 22:03:56 GMT
Its likely that its hitting an NPE on this line of code

Task targetTask = vertex.getTask(riEvent.getTargetIndex());
targetTask.registerTezEvent(tezEvent); <<<<<<<<<<<< this
line

So the error could be that you are generating X splits but less then X
tasks. So at some point there is a split event for a non-existent task. Are
you using any custom input initializer (or vertex manager)?

Bikas

-----Original Message-----
From: Kostas Tzoumas [mailto:ktzoumas@apache.org]
Sent: Thursday, January 08, 2015 1:41 PM
To: dev@tez.apache.org
Subject: Problem with large job on Flink-on-Tez application

Hi folks,

I am running a SQL-like query (similar to TPC-H Q3) on a prototype of
Flink-on-Tez. I am using the latest Tez master. It runs fine on smaller
scales (e.g., TPC-H scale 500), and I am getting the following error at
scale 1250:

15/01/08 22:07:42 INFO client.DAGClientImpl: DAG initialized:
CurrentState=Running
15/01/08 22:07:43 INFO client.DAGClientImpl: DAG: State: RUNNING Progress:
0% TotalTasks: 12092 Succeeded: 0 Running: 0 Failed: 0 Killed: 0
15/01/08 22:07:47 INFO client.DAGClientImpl: DAG: State: FAILED Progress:
0% TotalTasks: 12092 Succeeded: 0 Running: 0 Failed: 0 Killed: 1246
15/01/08 22:07:47 INFO client.DAGClientImpl: DAG completed.
FinalState=FAILED
15/01/08 22:07:47 ERROR client.TezExecutor: Flink Java Job at Thu Jan 08
22:07:33 CET 2015 failed with diagnostics: [Vertex failed,
vertexName=DataSource (at getCustomerDataSet(TPCHQuery3.java:217)
(org.apache.flink.api.java.io.CsvInputFormat))032ae46b-6bb9-4dcf-91c4-7e49b49f6546,
vertexId=vertex_1420727594991_0021_1_01, diagnostics=[Exception in
VertexManager, vertex=vertex_1420727594991_0021_1_01 [DataSource (at
getCustomerDataSet(TPCHQuery3.java:217)
(org.apache.flink.api.java.io.CsvInputFormat))032ae46b-6bb9-4dcf-91c4-7e49b49f6546],java.lang.NullPointerException
at
org.apache.tez.dag.app.dag.impl.VertexImpl.handleRoutedTezEvents(VertexImpl.java:3857)
at
org.apache.tez.dag.app.dag.impl.VertexImpl.scheduleTasks(VertexImpl.java:1265)
at
org.apache.tez.dag.app.dag.impl.VertexManager$VertexManagerPluginContextImpl.scheduleVertexTasks(VertexManager.java:144)
at
org.apache.tez.dag.app.dag.impl.ImmediateStartVertexManager.scheduleTasks(ImmediateStartVertexManager.java:100)
at
org.apache.tez.dag.app.dag.impl.ImmediateStartVertexManager.onVertexStarted(ImmediateStartVertexManager.java:75)
at
org.apache.tez.dag.app.dag.impl.VertexManager.onVertexStarted(VertexManager.java:365)
at
org.apache.tez.dag.app.dag.impl.VertexImpl.startVertex(VertexImpl.java:3320)
at
org.apache.tez.dag.app.dag.impl.VertexImpl.access$5100(VertexImpl.java:183)
at
org.apache.tez.dag.app.dag.impl.VertexImpl$StartTransition.transition(VertexImpl.java:3293)
at
org.apache.tez.dag.app.dag.impl.VertexImpl$StartTransition.transition(VertexImpl.java:3285)
at
org.apache.hadoop.yarn.state.StateMachineFactory$MultipleInternalArc.doTransition(StateMachineFactory.java:385)
at
org.apache.hadoop.yarn.state.StateMachineFactory.doTransition(StateMachineFactory.java:302)
at
org.apache.hadoop.yarn.state.StateMachineFactory.access$300(StateMachineFactory.java:46)
at
org.apache.hadoop.yarn.state.StateMachineFactory$InternalStateMachine.doTransition(StateMachineFactory.java:448)
at
org.apache.tez.state.StateMachineTez.doTransition(StateMachineTez.java:57)
at org.apache.tez.dag.app.dag.impl.VertexImpl.handle(VertexImpl.java:1587)
at org.apache.tez.dag.app.dag.impl.VertexImpl.handle(VertexImpl.java:182)
at
org.apache.tez.dag.app.DAGAppMaster$VertexEventDispatcher.handle(DAGAppMaster.java:1763)
at
org.apache.tez.dag.app.DAGAppMaster$VertexEventDispatcher.handle(DAGAppMaster.java:1749)
at org.apache.tez.common.AsyncDispatcher.dispatch(AsyncDispatcher.java:184)
at org.apache.tez.common.AsyncDispatcher$1.run(AsyncDispatcher.java:116)
at java.lang.Thread.run(Thread.java:745)


It may well be that this is a problem on the Flink side of things (albeit
not visible in the stack trace), I was just wondering if the error rings a
bell. Since I am creating an input task per input split, this job results in
quite a few of input tasks.

The logs contain one more exception [1] caused by the exception above.

Best,
Kostas

[1]

2015-01-08 22:07:44,448 ERROR [Dispatcher thread: Central] impl.VertexImpl:
Exception in VertexManager, vertex=vertex_1420727594991_0021_1_01
[DataSource (at getCustomerDataSet(TPCHQuery3.java:217)
(org.apache.flink.api.java.io.CsvInputFormat))032ae46b-6bb9-4dcf-91c4-7e49b49f6546]
org.apache.tez.dag.app.dag.impl.AMUserCodeException:
java.lang.NullPointerException
at
org.apache.tez.dag.app.dag.impl.VertexManager.onVertexStarted(VertexManager.java:368)
at
org.apache.tez.dag.app.dag.impl.VertexImpl.startVertex(VertexImpl.java:3320)
at
org.apache.tez.dag.app.dag.impl.VertexImpl.access$5100(VertexImpl.java:183)
at
org.apache.tez.dag.app.dag.impl.VertexImpl$StartTransition.transition(VertexImpl.java:3293)
at
org.apache.tez.dag.app.dag.impl.VertexImpl$StartTransition.transition(VertexImpl.java:3285)
at
org.apache.hadoop.yarn.state.StateMachineFactory$MultipleInternalArc.doTransition(StateMachineFactory.java:385)
at
org.apache.hadoop.yarn.state.StateMachineFactory.doTransition(StateMachineFactory.java:302)
at
org.apache.hadoop.yarn.state.StateMachineFactory.access$300(StateMachineFactory.java:46)
at
org.apache.hadoop.yarn.state.StateMachineFactory$InternalStateMachine.doTransition(StateMachineFactory.java:448)
at
org.apache.tez.state.StateMachineTez.doTransition(StateMachineTez.java:57)
at org.apache.tez.dag.app.dag.impl.VertexImpl.handle(VertexImpl.java:1587)
at org.apache.tez.dag.app.dag.impl.VertexImpl.handle(VertexImpl.java:182)
at
org.apache.tez.dag.app.DAGAppMaster$VertexEventDispatcher.handle(DAGAppMaster.java:1763)
at
org.apache.tez.dag.app.DAGAppMaster$VertexEventDispatcher.handle(DAGAppMaster.java:1749)
at org.apache.tez.common.AsyncDispatcher.dispatch(AsyncDispatcher.java:184)
at org.apache.tez.common.AsyncDispatcher$1.run(AsyncDispatcher.java:116)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.NullPointerException at
org.apache.tez.dag.app.dag.impl.VertexImpl.handleRoutedTezEvents(VertexImpl.java:3857)
at
org.apache.tez.dag.app.dag.impl.VertexImpl.scheduleTasks(VertexImpl.java:1265)
at
org.apache.tez.dag.app.dag.impl.VertexManager$VertexManagerPluginContextImpl.scheduleVertexTasks(VertexManager.java:144)
at
org.apache.tez.dag.app.dag.impl.ImmediateStartVertexManager.scheduleTasks(ImmediateStartVertexManager.java:100)
at
org.apache.tez.dag.app.dag.impl.ImmediateStartVertexManager.onVertexStarted(ImmediateStartVertexManager.java:75)
at
org.apache.tez.dag.app.dag.impl.VertexManager.onVertexStarted(VertexManager.java:365)
... 16 more

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