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From Rodolfo Viana <rodolfodelimavi...@gmail.com>
Subject Re: IndexOutOfBoundsException in ALS recommendation
Date Mon, 27 Jul 2015 23:47:19 GMT
When I got this error it was because I didn't have the input file in the
correct form.
Check especially the last line, your last line can not be a black space.

On Mon, Jul 27, 2015 at 8:09 PM, Suman Somasundar <
suman.somasundar@oracle.com> wrote:

> Hi,
>
>
>
> I am getting the following error when I try to ALS.
>
> I get this exception at userRatings job after the itemRatings job.
>
>
>
> 15/07/24 18:11:01 INFO mapreduce.Job: Task Id :
> attempt_1437779248212_0003_m_000064_6, Status : FAILED
>
> Error: java.lang.ArrayIndexOutOfBoundsException: -718978944
>
>         at
> org.apache.hadoop.io.WritableComparator.readInt(WritableComparator.java:211)
>
>         at
> org.apache.hadoop.io.IntWritable$Comparator.compare(IntWritable.java:91)
>
>         at
> org.apache.hadoop.mapred.MapTask$MapOutputBuffer.compare(MapTask.java:1265)
>
>         at org.apache.hadoop.util.QuickSort.sortInternal(QuickSort.java:99)
>
>         at org.apache.hadoop.util.QuickSort.sort(QuickSort.java:63)
>
>         at
> org.apache.hadoop.mapred.MapTask$MapOutputBuffer.sortAndSpill(MapTask.java:1594)
>
>         at
> org.apache.hadoop.mapred.MapTask$MapOutputBuffer.flush(MapTask.java:1482)
>
>         at
> org.apache.hadoop.mapred.MapTask$NewOutputCollector.close(MapTask.java:720)
>
>         at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:790)
>
>         at org.apache.hadoop.mapred.MapTask.run(MapTask.java:341)
>
>         at org.apache.hadoop.mapred.YarnChild$2.run(YarnChild.java:169)
>
>         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:1640)
>
>         at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:164)
>
>
>
>
>
> What I could not figure out is that this exception is from the Hadoop
> framework, not Mahout.
>
>
>
> I am running Hadoop 2.6.0 and Mahout 0.9.
>
>
>
> What is causing this exception?
>
>
>
> Thanks,
> Suman.
>



-- 
Rodolfo de Lima Viana
Undergraduate in Computer Science at UFCG

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