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via Stack Overflow by user3004041
, 1 year ago
org.apache.hadoop.io.LongWritable cannot be cast to org.apache.avro.mapred.AvroKey
java.lang.ClassCastException: org.apache.hadoop.io.LongWritable 
cannot be cast to org.apache.avro.mapred.AvroKey	at somepackage.BalanceByUser$BalanceCountMapper.map(BalanceByUser.java:1)