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From Tom Nichols <tmnich...@gmail.com>
Subject Re: help w/ table mapreduce job
Date Wed, 11 Feb 2009 12:37:19 GMT
I think I figured it out.  It was actually the column filter I was
using ("LMP:* instead of "LMP:") so it was passing 0 rows to the
Mapper.  There were a couple other errors as well but I worked through
them fairly quickly after that.  Thanks!

2009/2/11 stack <stack@duboce.net>:
> There's a lot of zeros in your job report Tom and your log.trace doesn't
> seem to be emitting records that made it into the map.  Why you use
> log.trace?  Is that a possibility on log4j -- or are you using a different
> logger?  Add logging to TableInputFormat?  To the split function and to its
> gets from the table?
>
> St.Ack
>
>
>
>
> On Tue, Feb 10, 2009 at 8:17 AM, Tom Nichols <tmnichols@gmail.com> wrote:
>
>> Hi,
>>
>> I'm trying to write a M/R job to do the following:
>>
>> - Scan a given table and collect unique column names
>> - Write those column names to another table with the source table name
>> as the row key, and columns in the format (Cols:<sourceColName>,
>> <sourceColName)
>>
>> I'm not sure what I'm doing wrong.  It appears that the mapper is
>> configured and then immediately closed w/o scanning any rows.  I've
>> verified there is data in my source table.  I don't see the reduce
>> task run at all.  Attached is the code and below is the log output
>> from running the task.  Thanks in advance for any pointers.
>>
>> 2009-02-10 11:14:55,087 INFO  (main)  JvmMetrics - Initializing JVM
>> Metrics with processName=JobTracker, sessionId=
>> 2009-02-10 11:14:55,151 WARN  (main)  JobClient - No job jar file set.
>>  User classes may not be found. See JobConf(Class) or
>> JobConf#setJar(String).
>> 2009-02-10 11:14:55,610 INFO  (main)  TableInputFormatBase - split:
>> 0->localhost:,
>> 2009-02-10 11:14:55,840 INFO  (main)  JobClient - Running job:
>> job_local_0001
>> 2009-02-10 11:14:55,890 INFO  (Thread-11)  TableInputFormatBase -
>> split: 0->localhost:,
>> 2009-02-10 11:14:55,931 INFO  (Thread-11)  MapTask - numReduceTasks: 1
>> 2009-02-10 11:14:55,957 INFO  (Thread-11)  MapTask - io.sort.mb = 100
>> 2009-02-10 11:14:56,239 INFO  (Thread-11)  MapTask - data buffer =
>> 79691776/99614720
>> 2009-02-10 11:14:56,239 INFO  (Thread-11)  MapTask - record buffer =
>> 262144/327680
>> 2009-02-10 11:14:56,863 INFO  (main)  JobClient -  map 0% reduce 0%
>> 2009-02-10 11:14:59,558 INFO  (Thread-11)
>> MetadataMapReduceJob$MetadatMapper - Mapper for table
>> DayAheadHourlyLMP configured
>> 2009-02-10 11:14:59,561 INFO  (Thread-11)
>> MetadataMapReduceJob$MetadatMapper - Mapper for table
>> DayAheadHourlyLMP closed
>> 2009-02-10 11:14:59,561 INFO  (Thread-11)  MapTask - Starting flush of
>> map output
>> 2009-02-10 11:14:59,612 INFO  (Thread-11)  MapTask - Index: (0, 2, 6)
>> 2009-02-10 11:14:59,613 INFO  (Thread-11)  TaskRunner -
>> Task:attempt_local_0001_m_000000_0 is done. And is in the process of
>> commiting
>> 2009-02-10 11:14:59,616 INFO  (Thread-11)  LocalJobRunner -
>> 2009-02-10 11:14:59,616 INFO  (Thread-11)  TaskRunner - Task
>> 'attempt_local_0001_m_000000_0' done.
>> 2009-02-10 11:14:59,648 INFO  (Thread-11)
>> MetadataMapReduceJob$MetadataReducer - Metadata Reducer is configured
>> 2009-02-10 11:14:59,663 INFO  (Thread-11)  Merger - Merging 1 sorted
>> segments
>> 2009-02-10 11:14:59,666 INFO  (Thread-11)  Merger - Down to the last
>> merge-pass, with 0 segments left of total size: 0 bytes
>> 2009-02-10 11:14:59,708 INFO  (Thread-11)  TaskRunner -
>> Task:attempt_local_0001_r_000000_0 is done. And is in the process of
>> commiting
>> 2009-02-10 11:14:59,709 INFO  (Thread-11)  LocalJobRunner - reduce > reduce
>> 2009-02-10 11:14:59,710 INFO  (Thread-11)  TaskRunner - Task
>> 'attempt_local_0001_r_000000_0' done.
>> 2009-02-10 11:14:59,866 INFO  (main)  JobClient - Job complete:
>> job_local_0001
>> 2009-02-10 11:14:59,867 INFO  (main)  JobClient - Counters: 11
>> 2009-02-10 11:14:59,867 INFO  (main)  JobClient -   File Systems
>> 2009-02-10 11:14:59,868 INFO  (main)  JobClient -     Local bytes
>> read=38422
>> 2009-02-10 11:14:59,868 INFO  (main)  JobClient -     Local bytes
>> written=77300
>> 2009-02-10 11:14:59,868 INFO  (main)  JobClient -   Map-Reduce Framework
>> 2009-02-10 11:14:59,868 INFO  (main)  JobClient -     Reduce input groups=0
>> 2009-02-10 11:14:59,868 INFO  (main)  JobClient -     Combine output
>> records=0
>> 2009-02-10 11:14:59,868 INFO  (main)  JobClient -     Map input records=0
>> 2009-02-10 11:14:59,868 INFO  (main)  JobClient -     Reduce output
>> records=0
>> 2009-02-10 11:14:59,869 INFO  (main)  JobClient -     Map output bytes=0
>> 2009-02-10 11:14:59,869 INFO  (main)  JobClient -     Map input bytes=0
>> 2009-02-10 11:14:59,869 INFO  (main)  JobClient -     Combine input
>> records=0
>> 2009-02-10 11:14:59,869 INFO  (main)  JobClient -     Map output records=0
>> 2009-02-10 11:14:59,869 INFO  (main)  JobClient -     Reduce input
>> records=0
>>
>

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