Hi,

> Does some simple word count example works on the cluster after the upgrade?

If not, maybe your job is pulling some dependency that’s causing this version 
conflict?

Piotrek

> On 21 Mar 2018, at 16:52, ashish pok <ashish...@yahoo.com> wrote:
> 
> Hi Piotrek,
> 
> Yes, this is a brand new Prod environment. 2.6 was in our lab.
> 
> Thanks,
> 
> -- Ashish
> 
> On Wed, Mar 21, 2018 at 11:39 AM, Piotr Nowojski
> <pi...@data-artisans.com> wrote:
> Hi,
> 
> Have you replaced all of your old Flink binaries with freshly downloaded 
> <https://flink.apache.org/downloads.html> Hadoop 2.7 versions? Are you sure 
> that something hasn't mix in the process?
> 
> Does some simple word count example works on the cluster after the upgrade?
> 
> Piotrek
> 
>> On 21 Mar 2018, at 16:11, ashish pok <ashish...@yahoo.com 
>> <mailto:ashish...@yahoo.com>> wrote:
>> 
>> Hi All,
>> 
>> We ran into a roadblock in our new Hadoop environment, migrating from 2.6 to 
>> 2.7. It was supposed to be an easy lift to get a YARN session but doesnt 
>> seem like :) We definitely are using 2.7 binaries but it looks like there is 
>> a call here to a private methos which screams runtime incompatibility. 
>> 
>> Anyone has seen this and have pointers?
>> 
>> Thanks, Ashish
>> Exception in thread "main" java.lang.IllegalAccessError: tried to access 
>> method 
>> org.apache.hadoop.yarn.client.ConfiguredRMFailoverProxyProvider.getProxyInternal()Ljava/lang/Object;
>>  from class 
>> org.apache.hadoop.yarn.client.RequestHedgingRMFailoverProxyProvider <>
>>             at 
>> org.apache.hadoop.yarn.client.RequestHedgingRMFailoverProxyProvider.init(RequestHedgingRMFailoverProxyProvider.java:75)
>>             at 
>> org.apache.hadoop.yarn.client.RMProxy.createRMFailoverProxyProvider(RMProxy.java:163)
>>             at 
>> org.apache.hadoop.yarn.client.RMProxy.createRMProxy(RMProxy.java:94)
>>             at 
>> org.apache.hadoop.yarn.client.ClientRMProxy.createRMProxy(ClientRMProxy.java:72)
>>             at 
>> org.apache.hadoop.yarn.client.api.impl.YarnClientImpl.serviceStart(YarnClientImpl.java:187)
>>             at 
>> org.apache.hadoop.service.AbstractService.start(AbstractService.java:193)
>>             at 
>> org.apache.flink.yarn.AbstractYarnClusterDescriptor.getYarnClient(AbstractYarnClusterDescriptor.java:314)
>>             at 
>> org.apache.flink.yarn.AbstractYarnClusterDescriptor.deployInternal(AbstractYarnClusterDescriptor.java:417)
>>             at 
>> org.apache.flink.yarn.AbstractYarnClusterDescriptor.deploySessionCluster(AbstractYarnClusterDescriptor.java:367)
>>             at 
>> org.apache.flink.yarn.cli.FlinkYarnSessionCli.run(FlinkYarnSessionCli.java:679)
>>             at 
>> org.apache.flink.yarn.cli.FlinkYarnSessionCli$1.call(FlinkYarnSessionCli.java:514)
>>             at 
>> org.apache.flink.yarn.cli.FlinkYarnSessionCli$1.call(FlinkYarnSessionCli.java:511)
>>             at java.security.AccessController.doPrivileged(Native Method)
>>             at javax.security.auth.Subject.doAs(Subject.java:422)
>>             at 
>> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1698)
>>             at 
>> org.apache.flink.runtime.security.HadoopSecurityContext.runSecured(HadoopSecurityContext.java:41)
>>             at 
>> org.apache.flink.yarn.cli.FlinkYarnSessionCli.main(FlinkYarnSessionCli.java:511)
>> 
> 

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