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Posted to dev@orc.apache.org by 章逸群 <gu...@gmail.com> on 2021/08/24 16:26:03 UTC

Do we need to adjust the minimum Hadoop version

Hi All.


I am writing a test example of mapreduce using orc.

NullPointerException during runtime.

java.lang.Exception: java.lang.NullPointerException
	at org.apache.hadoop.mapred.LocalJobRunner$Job.run(LocalJobRunner.java:403)
Caused by: java.lang.NullPointerException
	at org.apache.orc.mapred.OrcKey.readFields(OrcKey.java:57)
	at org.apache.hadoop.io.WritableComparator.compare(WritableComparator.java:129)
	at org.apache.hadoop.mapred.MapTask$MapOutputBuffer.compare(MapTask.java:1248)
	at org.apache.hadoop.util.QuickSort.fix(QuickSort.java:35)
	at org.apache.hadoop.util.QuickSort.sortInternal(QuickSort.java:87)
	at org.apache.hadoop.util.QuickSort.sort(QuickSort.java:63)
	at org.apache.hadoop.mapred.MapTask$MapOutputBuffer.sortAndSpill(MapTask.java:1582)
	at org.apache.hadoop.mapred.MapTask$MapOutputBuffer.flush(MapTask.java:1467)
	at org.apache.hadoop.mapred.MapTask$NewOutputCollector.close(MapTask.java:699)
	at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:769)
	at org.apache.hadoop.mapred.MapTask.run(MapTask.java:339)
	at org.apache.hadoop.mapred.LocalJobRunner$Job$MapTaskRunnable.run(LocalJobRunner.java:235)

The variable key inside OrcKey is not init. Analysis revealed a bug in
hadoop-common that was fixed in version 2.5.0.
https://issues.apache.org/jira/browse/HADOOP-10686
https://github.com/apache/hadoop/commit/fc7c8f9bf2588fd25f8b457ee4a9b444e619519c

Do we need to change min.hadoop.version to the ORC-mapreduce module ?
Is there a remedy for this?


Best,

Yiqun Zhang

Re: Do we need to adjust the minimum Hadoop version

Posted by Dongjoon Hyun <do...@gmail.com>.
Thank you for sending out the email.

Moreover, the current min hadoop version (2.2.0) looks too old and
unreasonable to me.

    <min.hadoop.version>2.2.0</min.hadoop.version>

For Apache ORC 1.7.0, I'm +1 to bump the minimum hadoop version to higher
versions.

Bests,
Dongjoon.



On Tue, Aug 24, 2021 at 1:43 PM 章逸群 <gu...@gmail.com> wrote:

> Hi All.
>
>
> I am writing a test example of mapreduce using orc.
>
> NullPointerException during runtime.
>
> java.lang.Exception: java.lang.NullPointerException
>         at
> org.apache.hadoop.mapred.LocalJobRunner$Job.run(LocalJobRunner.java:403)
> Caused by: java.lang.NullPointerException
>         at org.apache.orc.mapred.OrcKey.readFields(OrcKey.java:57)
>         at org.apache.hadoop.io
> .WritableComparator.compare(WritableComparator.java:129)
>         at
> org.apache.hadoop.mapred.MapTask$MapOutputBuffer.compare(MapTask.java:1248)
>         at org.apache.hadoop.util.QuickSort.fix(QuickSort.java:35)
>         at org.apache.hadoop.util.QuickSort.sortInternal(QuickSort.java:87)
>         at org.apache.hadoop.util.QuickSort.sort(QuickSort.java:63)
>         at
> org.apache.hadoop.mapred.MapTask$MapOutputBuffer.sortAndSpill(MapTask.java:1582)
>         at
> org.apache.hadoop.mapred.MapTask$MapOutputBuffer.flush(MapTask.java:1467)
>         at
> org.apache.hadoop.mapred.MapTask$NewOutputCollector.close(MapTask.java:699)
>         at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:769)
>         at org.apache.hadoop.mapred.MapTask.run(MapTask.java:339)
>         at
> org.apache.hadoop.mapred.LocalJobRunner$Job$MapTaskRunnable.run(LocalJobRunner.java:235)
>
> The variable key inside OrcKey is not init. Analysis revealed a bug in
> hadoop-common that was fixed in version 2.5.0.
> https://issues.apache.org/jira/browse/HADOOP-10686
>
> https://github.com/apache/hadoop/commit/fc7c8f9bf2588fd25f8b457ee4a9b444e619519c
>
> Do we need to change min.hadoop.version to the ORC-mapreduce module ?
> Is there a remedy for this?
>
>
> Best,
>
> Yiqun Zhang
>