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https://issues.apache.org/jira/browse/HIVE-1741?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13132852#comment-13132852
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He Yongqiang commented on HIVE-1741:
------------------------------------
+1, will commit after tests pass
> HiveInputFormat.readFields should print the cause when there's an exception
> ---------------------------------------------------------------------------
>
> Key: HIVE-1741
> URL: https://issues.apache.org/jira/browse/HIVE-1741
> Project: Hive
> Issue Type: Improvement
> Affects Versions: 0.7.0
> Reporter: Jean-Daniel Cryans
> Priority: Trivial
> Attachments: hive-1741.patch
>
>
> Minor annoyance when it comes to debugging using exotic input formats,
> currently if you do something wrong trying to get the HBase handler working
> you get something like this:
> {noformat}
> java.io.IOException: Cannot create an instance of InputSplit class =
> org.apache.hadoop.hive.hbase.HBaseSplit:org.apache.hadoop.hive.hbase.HBaseSplit
> at
> org.apache.hadoop.hive.ql.io.HiveInputFormat$HiveInputSplit.readFields(HiveInputFormat.java:147)
> at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:333)
> at org.apache.hadoop.mapred.MapTask.run(MapTask.java:307)
> at org.apache.hadoop.mapred.Child.main(Child.java:170)
> {noformat}
> It could be a lot more helpful to see the cause, in my case:
> {noformat}
> java.io.IOException: Cannot create an instance of InputSplit class =
> org.apache.hadoop.hive.hbase.HBaseSplit:org.apache.hadoop.hive.hbase.HBaseSplit
> at
> org.apache.hadoop.hive.ql.io.HiveInputFormat$HiveInputSplit.readFields(HiveInputFormat.java:147)
> at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:333)
> at org.apache.hadoop.mapred.MapTask.run(MapTask.java:307)
> at org.apache.hadoop.mapred.Child.main(Child.java:170)
> Caused by: java.lang.ClassNotFoundException:
> org.apache.hadoop.hive.hbase.HBaseSplit
> at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
> ...
> at java.lang.Class.forName0(Native Method)
> at java.lang.Class.forName(Class.java:247)
> at
> org.apache.hadoop.conf.Configuration.getClassByName(Configuration.java:907)
> at
> org.apache.hadoop.hive.ql.io.HiveInputFormat$HiveInputSplit.readFields(HiveInputFormat.java:144)
> {noformat}
> It's just a matter of doing this in readFields:
> {code}
> - + inputSplitClassName + ":" + e.getMessage());
> + + inputSplitClassName + ":" + e.getMessage(), e);
> {code}
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