[MAPREDUCE-7059] Downward Compatibility issue: MR job fails because of unknown setErasureCodingPolicy method from 3.x client to HDFS 2.x cluster

• Type: Bug
• Status: Resolved
• Priority: Critical
• Resolution: Fixed
• Affects Version/s: 3.0.0
• Fix Version/s: 3.1.0, 3.0.3
• Component/s: job submission
• Target Version/s: 3.1.0
• Hadoop Flags: Reviewed
• Assignee: Jiandan Yang
• Reporter: Jiandan Yang
• Created: 26/Feb/18 09:38
• Updated: 04/Apr/18 23:19
• Resolved: 01/Mar/18 02:23

Description

Running teragen failed in the version of hadoop-3.1, and hdfs server is 2.8.

bin/hadoop jar share/hadoop/mapreduce/hadoop-mapreduce-examples-3.1.0-SNAPSHOT.jar  teragen  100000 /teragen

The reason of failing is 2.8 HDFS does not have setErasureCodingPolicy.

one solution is parsing RemoteException in JobResourceUploader#disableErasure like this:

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);
      }
    }
  }

Does anyone have better solution?

The detailed exception trace is:

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)

Issue Links

• is broken by: MAPREDUCE-6954 Disable erasure coding for files that are uploaded to the MR staging area