Category Archives: Sqoop

Exception in thread “main” java.lang.IncompatibleClassChangeError: Found interface org.apache.hadoop.mapreduce.JobContext, but class was expected

Issue: While configuring Sqoop (Sqoop: Downloaded was 1.4.6) on HDFS (Hadoop: 2.7.2), I encountered the below error, Exception in thread “main” java.lang.IncompatibleClassChangeError: Found interface org.apache.hadoop.mapreduce.JobContext, but class was expected        at org.apache.sqoop.config.ConfigurationHelper.getJobNumMaps(ConfigurationHelper.java:65)        at com.cloudera.sqoop.config.ConfigurationHelper.getJobNumMaps(ConfigurationHelper.java:36)        at org.apache.sqoop.mapreduce.db.DataDrivenDBInputFormat.getSplits(DataDrivenDBInputFormat.java:125) Cause: Could be something to do … Continue reading

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Sqoop – Load Data to HDFS from Oracle

Overview: Apache Sqoop is a command line tool to load Data from RDBMS Databases to Hadoop and vice-versa. The Name Sqoop originated from Hadoop and SQL by taking SQ (from SQL) and OOP (from HadOOP). Sqoop uses Map Reduce to … Continue reading

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