Dear all
I created a database in HBase. First I was retrieving it using Java APIs but it
was taking a lot of time(43 seconds) to retrieve it. I thought of writing Map
Reduce code to retrieve it to make it faster. But I am getting Null Pointer
Exception in my code. Following is the excerpt from my code:
TableMapReduceUtil.initTableMapperJob(
tableName, // input
HBase table name
scanRows, // Scan
instance to control CF and attribute selection
MyMapper.class, // mapper
null, // mapper
output key
null, // mapper
output value
job);
job.setOutputFormatClass(NullOutputFormat.class); // because we aren't
emitting anything from mapper
boolean b = job.waitForCompletion(true);
if (!b) {
throw new IOException("error with job!");
}
The error I get is as follows:
Exception in thread "main" java.lang.NullPointerException
at
org.apache.hadoop.hbase.mapreduce.TableMapReduceUtil.initTableMapperJob(TableMapReduceUtil.java:100)
at
org.apache.hadoop.hbase.mapreduce.TableMapReduceUtil.initTableMapperJob(TableMapReduceUtil.java:75)
Please help me
Thanks and Regards
Prakrati Agrawal | Developer - Big Data(I&D)| 9731648376 | www.mu-sigma.com
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