I'm not sure of the specific error but you may not want to be using 0.21. "23 August, 2010: release 0.21.0 available This release contains many improvements, new features, bug fixes and optimizations. It has not undergone testing at scale and should not be considered stable or suitable for production. This release is being classified as a minor release, which means that it should be API compatible with 0.20.2." -- http://hadoop.apache.org/hdfs/releases.html#23+August%2C+2010%3A+release+0.21.0+available
So it's a release that's not recommended/suitable for production. So compatibility with 0.21 isn't a big priority right now. On Nov 5, 2010, at 12:51 PM, Utku Can Topçu wrote: > When I try to read a CF from Hadoop, just after issuing the run I get this > error: > > Exception in thread "main" java.lang.IncompatibleClassChangeError: Found > interface org.apache.hadoop.mapreduce.JobContext, but class was expected > at > org.apache.cassandra.hadoop.ColumnFamilyInputFormat.getSplits(ColumnFamilyInputFormat.java:88) > at > org.apache.hadoop.mapreduce.JobSubmitter.writeNewSplits(JobSubmitter.java:401) > at > org.apache.hadoop.mapreduce.JobSubmitter.writeSplits(JobSubmitter.java:418) > at > org.apache.hadoop.mapreduce.JobSubmitter.submitJobInternal(JobSubmitter.java:338) > at org.apache.hadoop.mapreduce.Job.submit(Job.java:960) > at org.apache.hadoop.mapreduce.Job.waitForCompletion(Job.java:976) > > However the same code works fine for hadoop 0.20.2? Is there a prospective > patch for this issue? > > Regards, > Utku
