Description
I've recently encountered this myself during running gora-cassandra aginst Keith Turner's goraci module where my gora-cassandra-mapping.xml configuration was incorrect. This has also been experienced further downstream in Nutch 2.X land where new users are met with a rather hellish stack such as the following
12/07/21 13:04:27 INFO mapred.JobClient: Task Id : attempt_201207211239_0003_m_000001_2, Status : FAILED org.apache.gora.util.GoraException: java.io.IOException at org.apache.gora.store.DataStoreFactory.createDataStore(DataStoreFactory.java:167) at org.apache.gora.store.DataStoreFactory.getDataStore(DataStoreFactory.java:278) at goraci.Generator$GeneratorMapper.map(Generator.java:197) at goraci.Generator$GeneratorMapper.map(Generator.java:179) at org.apache.hadoop.mapreduce.Mapper.run(Mapper.java:144) at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:764) at org.apache.hadoop.mapred.MapTask.run(MapTask.java:370) at org.apache.hadoop.mapred.Child$4.run(Child.java:255) at java.security.AccessController.doPrivileged(Native Method) at javax.security.auth.Subject.doAs(Subject.java:396) at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1093) at org.apache.hadoop.mapred.Child.main(Child.java:249) Caused by: java.io.IOException at org.apache.gora.cassandra.store.CassandraStore.initialize(CassandraStore.java:88) at org.apache.gora.store.DataStoreFactory.initializeDataStore(DataStoreFactory.java:102) at org.apache.gora.store.DataStoreFactory.createDataStore(DataStoreFactory.java:161) ... 11 more Caused by: java.lang.NullPointerException at org.apache.gora.cassandra.store.CassandraMapping.<init>(CassandraMapping.java:117) at org.apache.gora.cassandra.store.CassandraMappingManager.get(CassandraMappingManager.java:84) at org.apache.gora.cassandra.store.CassandraClient.initialize(CassandraClient.java:83) at org.apache.gora.cassandra.store.CassandraStore.initialize(CassandraStore.java:85) ... 13 more
We should implement much better logging for this which clearly specifies that it is a mapping problem due to incorrect mapping configuration.
Attachments
Issue Links
- relates to
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NUTCH-1435 Host jobs throw NullPointerException with MySQL
- Closed