Mithun Radhakrishnan created HIVE-11470:
-------------------------------------------
Summary: NPE in DynamicPartFileRecordWriterContainer on null
part-keys.
Key: HIVE-11470
URL: https://issues.apache.org/jira/browse/HIVE-11470
Project: Hive
Issue Type: Bug
Components: HCatalog
Affects Versions: 1.2.0
Reporter: Mithun Radhakrishnan
Assignee: Mithun Radhakrishnan
When partitioning data using {{HCatStorer}}, one sees the following NPE, if the
dyn-part-key is of null-value:
{noformat}
2015-07-30 23:59:59,627 WARN [main] org.apache.hadoop.mapred.YarnChild:
Exception running child : java.io.IOException: java.lang.NullPointerException
at
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigGenericMapReduce$Reduce.runPipeline(PigGenericMapReduce.java:473)
at
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigGenericMapReduce$Reduce.processOnePackageOutput(PigGenericMapReduce.java:436)
at
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigGenericMapReduce$Reduce.reduce(PigGenericMapReduce.java:416)
at
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigGenericMapReduce$Reduce.reduce(PigGenericMapReduce.java:256)
at org.apache.hadoop.mapreduce.Reducer.run(Reducer.java:171)
at org.apache.hadoop.mapred.ReduceTask.runNewReducer(ReduceTask.java:627)
at org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:389)
at org.apache.hadoop.mapred.YarnChild$2.run(YarnChild.java:163)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:415)
at
org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1694)
at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:158)
Caused by: java.lang.NullPointerException
at
org.apache.hive.hcatalog.mapreduce.DynamicPartitionFileRecordWriterContainer.getLocalFileWriter(DynamicPartitionFileRecordWriterContainer.java:141)
at
org.apache.hive.hcatalog.mapreduce.FileRecordWriterContainer.write(FileRecordWriterContainer.java:110)
at
org.apache.hive.hcatalog.mapreduce.FileRecordWriterContainer.write(FileRecordWriterContainer.java:54)
at org.apache.hive.hcatalog.pig.HCatBaseStorer.putNext(HCatBaseStorer.java:309)
at org.apache.hive.hcatalog.pig.HCatStorer.putNext(HCatStorer.java:61)
at
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigOutputFormat$PigRecordWriter.write(PigOutputFormat.java:139)
at
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigOutputFormat$PigRecordWriter.write(PigOutputFormat.java:98)
at
org.apache.hadoop.mapred.ReduceTask$NewTrackingRecordWriter.write(ReduceTask.java:558)
at
org.apache.hadoop.mapreduce.task.TaskInputOutputContextImpl.write(TaskInputOutputContextImpl.java:89)
at
org.apache.hadoop.mapreduce.lib.reduce.WrappedReducer$Context.write(WrappedReducer.java:105)
at
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigGenericMapReduce$Reduce.runPipeline(PigGenericMapReduce.java:471)
... 11 more
{noformat}
The reason is that the {{DynamicPartitionFileRecordWriterContainer}} makes an
unfortunate assumption when fetching a local file-writer instance:
{code:title=DynamicPartitionFileRecordWriterContainer.java}
@Override
protected LocalFileWriter getLocalFileWriter(HCatRecord value)
throws IOException, HCatException {
OutputJobInfo localJobInfo = null;
// Calculate which writer to use from the remaining values - this needs to
// be done before we delete cols.
List<String> dynamicPartValues = new ArrayList<String>();
for (Integer colToAppend : dynamicPartCols) {
dynamicPartValues.add(value.get(colToAppend).toString()); // <-- YIKES!
}
...
}
{code}
Must check for null, and substitute with {{"\_\_HIVE_DEFAULT_PARTITION\_\_"}},
or equivalent.
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