incubator-hama-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Edward J. Yoon" <edwardy...@apache.org>
Subject Re: NullPointerException at AbstractVector.get(AbstractVector.java:44)
Date Mon, 08 Dec 2008 06:08:40 GMT
Somtimes, job done successfully. BTW, Reduce input groups=110. I guess
this is a number of BlockIDs. Should it be a 10 * 10 = 100?

----
08/12/08 14:46:52 INFO hama.AbstractMatrix: Convert to 10 * 10 blocked matrix
...
08/12/08 14:52:27 INFO mapred.JobClient:     Local bytes written=2662743172
08/12/08 14:52:27 INFO mapred.JobClient:   Job Counters
08/12/08 14:52:27 INFO mapred.JobClient:     Launched reduce tasks=2
08/12/08 14:52:27 INFO mapred.JobClient:     Launched map tasks=13
08/12/08 14:52:27 INFO mapred.JobClient:   Map-Reduce Framework
08/12/08 14:52:27 INFO mapred.JobClient:     Reduce input groups=110
08/12/08 14:52:27 INFO mapred.JobClient:     Combine output records=0
08/12/08 14:52:27 INFO mapred.JobClient:     Map input records=7556
08/12/08 14:52:27 INFO mapred.JobClient:     Reduce output records=0
08/12/08 14:52:27 INFO mapred.JobClient:     Map output bytes=1020493900
08/12/08 14:52:27 INFO mapred.JobClient:     Map input bytes=0
08/12/08 14:52:27 INFO mapred.JobClient:     Combine input records=0
08/12/08 14:52:27 INFO mapred.JobClient:     Map output records=75560
08/12/08 14:52:27 INFO mapred.JobClient:     Reduce input records=75560

On Mon, Dec 8, 2008 at 2:31 PM, Samuel Guo <guosijie@gmail.com> wrote:
> It is strange.
> Let's review the code again to find what's wrong.
>
> On Mon, Dec 8, 2008 at 12:26 PM, Edward J. Yoon <edwardyoon@apache.org>wrote:
>
>> [d8g053:/root/hama-trunk]# bin/hama examples mult -m 10 -r 10 fA fB
>> Size : 4,000
>> block_num : 10
>>
>> [d8g053:/root/hama-trunk]# bin/hama examples random 4000 4000 fB
>> ...
>> [d8g053:/root/hama-trunk]# bin/hama examples mult -m 10 -r 10 fA fB
>>
>> 08/12/08 13:23:57 INFO hama.AbstractMatrix: Convert to 10 * 10 blocked
>> matrix
>> 08/12/08 13:23:57 WARN mapred.JobClient: Use GenericOptionsParser for
>> parsing the arguments. Applications should implement Tool for the
>> same.
>> 08/12/08 13:23:57 WARN mapred.JobClient: Use genericOptions for the
>> option -libjars
>> 08/12/08 13:23:57 WARN mapred.JobClient: No job jar file set.  User
>> classes may not be found. See JobConf(Class) or
>> JobConf#setJar(String).
>> 08/12/08 13:23:57 INFO mapred.JobClient: Running job: job_200812051425_0027
>> 08/12/08 13:23:58 INFO mapred.JobClient:  map 0% reduce 0%
>> 08/12/08 13:24:29 INFO mapred.JobClient: Task Id :
>> attempt_200812051425_0027_m_000001_0, Status : FAILED
>> java.lang.NullPointerException: v(1) : java.lang.NullPointerException
>>        at org.apache.hama.AbstractVector.get(AbstractVector.java:44)
>>        at org.apache.hama.DenseVector.subVector(DenseVector.java:151)
>>        at
>> org.apache.hama.mapred.BlockingMapRed$BlockingMapper.map(BlockingMapRed.java:112)
>>        at
>> org.apache.hama.mapred.BlockingMapRed$BlockingMapper.map(BlockingMapRed.java:98)
>>        at org.apache.hadoop.mapred.MapRunner.run(MapRunner.java:47)
>>        at org.apache.hadoop.mapred.MapTask.run(MapTask.java:227)
>>        at
>> org.apache.hadoop.mapred.TaskTracker$Child.main(TaskTracker.java:2207)
>>
>>
>>
>> On Thu, Dec 4, 2008 at 11:30 PM, Samuel Guo <guosijie@gmail.com> wrote:
>> > what is the matrix's size?
>> > what is the block's size?
>> > can the matrix's size be interge-divided by block's size?
>> > if not, the last sub-vector's index range will be out of bound.
>> >
>> > so, the get() method in AbstractVector will get *Null* when calling
>> > *this.entries.get(index)*. The code is as below.
>> >
>> > public double get(int index) throws NullPointerException {
>> >    return this.entries.get(index).getValue();
>> > }
>> >
>> > It is a bug. A Jira may be filed to fix two files of the code.
>> >
>> > first:
>> > Method *setBlockPosition* in DenseMatrix class;
>> > second:
>> > Class *BlockingMapper* in BlockingMapRed class;
>> >
>> > I am sorry. :-(
>> > I have found the potential bug in DenseMatrix when I write the
>> > BlockingMapRed class. But I forget to fix it and use the same way to
>> > caculate the block ranges during mapping.
>> >
>> > On Thu, Dec 4, 2008 at 3:09 PM, Edward J. Yoon <edwardyoon@apache.org
>> >wrote:
>> >
>> >> Can someone figure out this problem?
>> >>
>> >> 08/12/04 15:58:37 INFO hama.AbstractMatrix: Convert to 20 * 20 blocked
>> >> matrix
>> >> 08/12/04 15:58:37 WARN mapred.JobClient: Use GenericOptionsParser for
>> >> parsing the arguments. Applications should implement Tool for the
>> >> same.
>> >> 08/12/04 15:58:37 WARN mapred.JobClient: Use genericOptions for the
>> >> option -libjars
>> >> 08/12/04 15:58:38 WARN mapred.JobClient: No job jar file set.  User
>> >> classes may not be found. See JobConf(Class) or
>> >> JobConf#setJar(String).
>> >> 08/12/04 15:58:38 INFO mapred.JobClient: Running job:
>> job_200812041310_0026
>> >> 08/12/04 15:58:39 INFO mapred.JobClient:  map 0% reduce 0%
>> >> 08/12/04 15:59:29 INFO mapred.JobClient: Task Id :
>> >> attempt_200812041310_0026_m_000002_0, Status : FAILED
>> >> java.lang.NullPointerException: v(1) : java.lang.NullPointerException
>> >>        at org.apache.hama.AbstractVector.get(AbstractVector.java:44)
>> >>        at org.apache.hama.DenseVector.subVector(DenseVector.java:151)
>> >>        at
>> >>
>> org.apache.hama.mapred.BlockingMapRed$BlockingMapper.map(BlockingMapRed.java:112)
>> >>        at
>> >>
>> org.apache.hama.mapred.BlockingMapRed$BlockingMapper.map(BlockingMapRed.java:98)
>> >>        at org.apache.hadoop.mapred.MapRunner.run(MapRunner.java:47)
>> >>        at org.apache.hadoop.mapred.MapTask.run(MapTask.java:227)
>> >>        at
>> >> org.apache.hadoop.mapred.TaskTracker$Child.main(TaskTracker.java:2207)
>> >> --
>> >> Best Regards, Edward J. Yoon @ NHN, corp.
>> >> edwardyoon@apache.org
>> >> http://blog.udanax.org
>> >>
>> >
>>
>>
>>
>> --
>> Best Regards, Edward J. Yoon @ NHN, corp.
>> edwardyoon@apache.org
>> http://blog.udanax.org
>>
>



-- 
Best Regards, Edward J. Yoon @ NHN, corp.
edwardyoon@apache.org
http://blog.udanax.org

Mime
View raw message