java - Hadoop 2.2.0 mapreduce job not running after upgrading from hadoop 1.0.4

Question

I have upgraded my hadoop version from 1.0.4 to 2.2.0. The mapreduce job was running fine earlier. Now i have added almost all jars provided for hadoop 2.2.0. Still it gives me this exception. Let me know where i am doing wrong.

Exception in thread "main" java.lang.NoClassDefFoundError: com/google/protobuf/ServiceException
    at org.apache.hadoop.ipc.ProtobufRpcEngine.<clinit>(ProtobufRpcEngine.java:69)
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Class.java:270)
    at org.apache.hadoop.conf.Configuration.getClassByNameOrNull(Configuration.java:1659)
    at org.apache.hadoop.conf.Configuration.getClassByName(Configuration.java:1624)
    at org.apache.hadoop.conf.Configuration.getClass(Configuration.java:1718)
    at org.apache.hadoop.ipc.RPC.getProtocolEngine(RPC.java:203)
    at org.apache.hadoop.ipc.RPC.getProtocolProxy(RPC.java:537)
    at org.apache.hadoop.hdfs.NameNodeProxies.createNNProxyWithClientProtocol(NameNodeProxies.java:328)
    at org.apache.hadoop.hdfs.NameNodeProxies.createNonHAProxy(NameNodeProxies.java:235)
    at org.apache.hadoop.hdfs.NameNodeProxies.createProxy(NameNodeProxies.java:139)
    at org.apache.hadoop.hdfs.DFSClient.<init>(DFSClient.java:510)
    at org.apache.hadoop.hdfs.DFSClient.<init>(DFSClient.java:453)
    at org.apache.hadoop.hdfs.DistributedFileSystem.initialize(DistributedFileSystem.java:136)
    at org.apache.hadoop.fs.FileSystem.createFileSystem(FileSystem.java:2433)
    at org.apache.hadoop.fs.FileSystem.access$200(FileSystem.java:88)
    at org.apache.hadoop.fs.FileSystem$Cache.getInternal(FileSystem.java:2467)
    at org.apache.hadoop.fs.FileSystem$Cache.get(FileSystem.java:2449)
    at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:367)
    at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:166)

Caused by: java.lang.ClassNotFoundException: com.google.protobuf.ServiceException
    at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:358)

Thanks in advance.

Answer 1

1. Please check your protobuf dependency. AFAIR Hadoop 2.x needs 2.5.x (please check your hadoop dependencies) and you could just take outdated one because of some external component.
2. Just for note: if your job uses org.apache.hadoop.mapreduce package it could be binary incompatible with Hadoop 2.x. You should recompile in this case. There should be no such issue with "old" API org.apache.hadoop.mapred. But I'd recommend recompile in any case.

Hope this at least help.