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From Aljoscha Krettek <aljos...@apache.org>
Subject Re: problem scale Flink job on YARN
Date Thu, 19 Oct 2017 16:47:46 GMT
Hi Lei,

Which version of Flink would that be? I'm guessing >= 1.3.x? In Flink 1.1 the hash of an
operator was tied to the parallelism but starting with 1.2 that shouldn't happen anymore.

Also, are you changing the parallelism job-wide or are there operators with differing parallelism?
For example, could there be a source with parallelism 1 and an operator that had parallelism
1 after that which now has a different parallelism?

Best,
Aljoscha

> On 16. Oct 2017, at 06:28, Lei Chen <leyncl@gmail.com> wrote:
> 
> Hi, 
> 
> We're trying to implement some module to help autoscale our pipeline which is built 
with Flink on YARN. According to the document, the suggested procedure seems to be:
> 
> 1. cancel job with savepoint
> 2. start new job with increased YARN TM number and parallelism. 
> 
> However, step 2 always gave error 
> 
> Caused by: java.lang.IllegalStateException: Failed to rollback to savepoint hdfs://10.106.238.14:/tmp/savepoint-767421-20907d234655.
Cannot map savepoint state for operator 37dfe905df17858e07858039ce3d8ae1 to the new program,
because the operator is not available in the new program. If you want to allow to skip this,
you can set the --allowNonRestoredState option on the CLI.
> 	at org.apache.flink.runtime.checkpoint.savepoint.SavepointLoader.loadAndValidateSavepoint(SavepointLoader.java:130)
> 	at org.apache.flink.runtime.checkpoint.CheckpointCoordinator.restoreSavepoint(CheckpointCoordinator.java:1140)
> 	at org.apache.flink.runtime.jobmanager.JobManager$$anonfun$org$apache$flink$runtime$jobmanager$JobManager$$submitJob$1.apply$mcV$sp(JobManager.scala:1386)
> 	at org.apache.flink.runtime.jobmanager.JobManager$$anonfun$org$apache$flink$runtime$jobmanager$JobManager$$submitJob$1.apply(JobManager.scala:1372)
> 	at org.apache.flink.runtime.jobmanager.JobManager$$anonfun$org$apache$flink$runtime$jobmanager$JobManager$$submitJob$1.apply(JobManager.scala:1372)
> 	at scala.concurrent.impl.Future$PromiseCompletingRunnable.liftedTree1$1(Future.scala:24)
> 	at scala.concurrent.impl.Future$PromiseCompletingRunnable.run(Future.scala:24)
> 	at akka.dispatch.TaskInvocation.run(AbstractDispatcher.scala:40)
> 	at akka.dispatch.ForkJoinExecutorConfigurator$AkkaForkJoinTask.exec(AbstractDispatcher.scala:397)
> 	at scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)
> 	at scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339)
> 	at scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)
> 	at scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)
> 
> The procedure worked fine if parallelism was not changed. 
> 
> Also want to mention that I didn't manually specify OperatorID in my job. The document
does mentioned manually OperatorID assignment is suggested, just curious is that mandatory
in my case to fix the problem I'm seeing, given that my program doesn't change at all so the
autogenerated operatorID should be unchanged after parallelism increase?
> 
> thanks,
> Lei


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