Talat UYARER created GORA-403:
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Summary: Gora does not work on Hadoop 2
Key: GORA-403
URL: https://issues.apache.org/jira/browse/GORA-403
Project: Apache Gora
Issue Type: Bug
Components: gora-core
Affects Versions: 0.5
Reporter: Talat UYARER
Priority: Critical
Fix For: 0.6
I try to use Gora 0.5 on Hadoop 2.5.2 cluster. However When I submit a job I
get this error.
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java.lang.Exception: java.lang.IncompatibleClassChangeError: Found interface
org.apache.hadoop.mapreduce.TaskAttemptContext, but class was expected
at
org.apache.hadoop.mapred.LocalJobRunner$Job.runTasks(LocalJobRunner.java:462)
at
org.apache.hadoop.mapred.LocalJobRunner$Job.run(LocalJobRunner.java:522)
Caused by: java.lang.IncompatibleClassChangeError: Found interface
org.apache.hadoop.mapreduce.TaskAttemptContext, but class was expected
at
org.apache.gora.mapreduce.GoraOutputFormat.getRecordWriter(GoraOutputFormat.java:83)
at
org.apache.hadoop.mapred.MapTask$NewDirectOutputCollector.<init>(MapTask.java:624)
at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:744)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:340)
at
org.apache.hadoop.mapred.LocalJobRunner$Job$MapTaskRunnable.run(LocalJobRunner.java:243)
at
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
at java.util.concurrent.FutureTask.run(FutureTask.java:262)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745)
{panel}
IMHO Reason of the problem is Our shim modules is not enough for abstraction of
hadoop1 and hadoop2. We should test our code on Hadoop 2 Testing utils. Wdyt
folks ?
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