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https://issues.apache.org/jira/browse/MAPREDUCE-7059?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Lei (Eddy) Xu updated MAPREDUCE-7059:
-------------------------------------
    Fix Version/s:     (was: 3.0.2)
                   3.0.3

> Downward Compatibility issue: MR job fails because of unknown 
> setErasureCodingPolicy method from 3.x client to HDFS 2.x cluster
> -------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-7059
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-7059
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: job submission
>    Affects Versions: 3.0.0
>            Reporter: Jiandan Yang 
>            Assignee: Jiandan Yang 
>            Priority: Critical
>             Fix For: 3.1.0, 3.0.3
>
>         Attachments: MAPREDUCE-7059.001.patch, MAPREDUCE-7059.002.patch, 
> MAPREDUCE-7059.003.patch, MAPREDUCE-7059.004.patch, MAPREDUCE-7059.005.patch, 
> MAPREDUCE-7059.006.patch
>
>
> Running teragen failed in the version of hadoop-3.1, and hdfs server is 2.8.
> {code:java}
> bin/hadoop jar 
> share/hadoop/mapreduce/hadoop-mapreduce-examples-3.1.0-SNAPSHOT.jar  teragen  
> 100000 /teragen
> {code}
> The reason of failing is 2.8 HDFS does not have setErasureCodingPolicy.
> one  solution is parsing RemoteException in 
> JobResourceUploader#disableErasure like this:
> {code:java}
> private void disableErasureCodingForPath(FileSystem fs, Path path)
>       throws IOException {
>     try {
>       if (jtFs instanceof DistributedFileSystem) {
>         LOG.info("Disabling Erasure Coding for path: " + path);
>         DistributedFileSystem dfs = (DistributedFileSystem) jtFs;
>         dfs.setErasureCodingPolicy(path,
>             SystemErasureCodingPolicies.getReplicationPolicy().getName());
>       }
>     } catch (RemoteException e) {
>       if (!e.getClassName().equals(RpcNoSuchMethodException.class.getName())) 
> {
>         throw e;
>       } else {
>         LOG.warn(
>             "hdfs server does not have method disableErasureCodingForPath," 
>                 + " and skip disableErasureCodingForPath", e);
>       }
>     }
>   }
> {code}
> Does anyone have better solution?
> The detailed exception trace is:
> {code:java}
> 2018-02-26 11:22:53,178 INFO mapreduce.JobSubmitter: Cleaning up the staging 
> area /tmp/hadoop-yarn/staging/hadoop/.staging/job_1518615699369_0006
> org.apache.hadoop.ipc.RemoteException(org.apache.hadoop.ipc.RpcNoSuchMethodException):
>  Unknown method setErasureCodingPolicy called on 
> org.apache.hadoop.hdfs.protocol.ClientProtocol protocol.
>       at 
> org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:436)
>       at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:989)
>       at org.apache.hadoop.ipc.Server$RpcCall.run(Server.java:846)
>       at org.apache.hadoop.ipc.Server$RpcCall.run(Server.java:789)
>       at java.security.AccessController.doPrivileged(Native Method)
>       at javax.security.auth.Subject.doAs(Subject.java:422)
>       at 
> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1804)
>       at org.apache.hadoop.ipc.Server$Handler.run(Server.java:2457)
>       at org.apache.hadoop.ipc.Client.getRpcResponse(Client.java:1491)
>       at org.apache.hadoop.ipc.Client.call(Client.java:1437)
>       at org.apache.hadoop.ipc.Client.call(Client.java:1347)
>       at 
> org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:228)
>       at 
> org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:116)
>       at com.sun.proxy.$Proxy11.setErasureCodingPolicy(Unknown Source)
>       at 
> org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolTranslatorPB.setErasureCodingPolicy(ClientNamenodeProtocolTranslatorPB.java:1583)
>       at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>       at 
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
>       at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>       at java.lang.reflect.Method.invoke(Method.java:498)
>       at 
> org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:422)
>       at 
> org.apache.hadoop.io.retry.RetryInvocationHandler$Call.invokeMethod(RetryInvocationHandler.java:165)
>       at 
> org.apache.hadoop.io.retry.RetryInvocationHandler$Call.invoke(RetryInvocationHandler.java:157)
>       at 
> org.apache.hadoop.io.retry.RetryInvocationHandler$Call.invokeOnce(RetryInvocationHandler.java:95)
>       at 
> org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:359)
>       at com.sun.proxy.$Proxy12.setErasureCodingPolicy(Unknown Source)
>       at 
> org.apache.hadoop.hdfs.DFSClient.setErasureCodingPolicy(DFSClient.java:2678)
>       at 
> org.apache.hadoop.hdfs.DistributedFileSystem$63.doCall(DistributedFileSystem.java:2665)
>       at 
> org.apache.hadoop.hdfs.DistributedFileSystem$63.doCall(DistributedFileSystem.java:2662)
>       at 
> org.apache.hadoop.fs.FileSystemLinkResolver.resolve(FileSystemLinkResolver.java:81)
>       at 
> org.apache.hadoop.hdfs.DistributedFileSystem.setErasureCodingPolicy(DistributedFileSystem.java:2680)
>       at 
> org.apache.hadoop.mapreduce.JobResourceUploader.disableErasureCodingForPath(JobResourceUploader.java:882)
>       at 
> org.apache.hadoop.mapreduce.JobResourceUploader.uploadResourcesInternal(JobResourceUploader.java:174)
>       at 
> org.apache.hadoop.mapreduce.JobResourceUploader.uploadResources(JobResourceUploader.java:131)
>       at 
> org.apache.hadoop.mapreduce.JobSubmitter.copyAndConfigureFiles(JobSubmitter.java:102)
>       at 
> org.apache.hadoop.mapreduce.JobSubmitter.submitJobInternal(JobSubmitter.java:197)
>       at org.apache.hadoop.mapreduce.Job$11.run(Job.java:1570)
>       at org.apache.hadoop.mapreduce.Job$11.run(Job.java:1567)
>       at java.security.AccessController.doPrivileged(Native Method)
>       at javax.security.auth.Subject.doAs(Subject.java:422)
>       at 
> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1965)
>       at org.apache.hadoop.mapreduce.Job.submit(Job.java:1567)
>       at org.apache.hadoop.mapreduce.Job.waitForCompletion(Job.java:1588)
>       at org.apache.hadoop.examples.terasort.TeraGen.run(TeraGen.java:304)
>       at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:76)
>       at org.apache.hadoop.examples.terasort.TeraGen.main(TeraGen.java:308)
>       at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>       at 
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
>       at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>       at java.lang.reflect.Method.invoke(Method.java:498)
>       at 
> org.apache.hadoop.util.ProgramDriver$ProgramDescription.invoke(ProgramDriver.java:71)
>       at org.apache.hadoop.util.ProgramDriver.run(ProgramDriver.java:144)
>       at org.apache.hadoop.examples.ExampleDriver.main(ExampleDriver.java:74)
>       at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>       at 
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
>       at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>       at java.lang.reflect.Method.invoke(Method.java:498)
>       at org.apache.hadoop.util.RunJar.run(RunJar.java:304)
>       at org.apache.hadoop.util.RunJar.main(RunJar.java:218)
> {code}



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