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Re: mapred.tasktacker.reduce.tasks.maximum issue - MapReduce - [mail # user]
...may be it is not reading the right configuration file.  if possible,make a malformed file,then restart tasktracker where it must fail to do so.   On Thu, Nov 14, 2013 at 11:53 PM, ...
   Author: Zizon Qiu, 2013-11-15, 01:57
Re: Submitting mapreduce and nothing happens - MapReduce - [mail # user]
...try use job.waitFromComplete(true) instead of job.submit(). it should show more details.   On Mon, Apr 15, 2013 at 6:06 PM, Amit Sela  wrote:  ...
   Author: Zizon Qiu, 2013-04-17, 03:40
Re: Hadoop-1.1.1 namenode and datanode version mismatch - MapReduce - [mail # user]
...the version is not match,as the log indicated: namenode:1.1.1 datanode:1.1.2-SNAPSHOT  hadoop.relaxed.worker.version.check only works when version match(relax just revision check). &nbs...
   Author: Zizon Qiu, 2012-12-13, 06:53
Re: Can dynamic Classes be accessible to Mappers/Reducers? - MapReduce - [mail # user]
...when submiting a job,the ToolRunnuer or JobClient just distribute your jars to hdfs, so that tasktrackers can launch/"re-run" it.  In your case,you should have your dynamic class re-gen...
   Author: Zizon Qiu, 2012-11-13, 01:54
Re: jobtracker page @50030 timeout or take very long time. - MapReduce - [mail # user]
...What about the gc logs?  On Fri, Nov 2, 2012 at 11:16 AM, Harsh J  wrote:  ...
   Author: Zizon Qiu, 2012-11-02, 03:32
Re: hanging context.write() with large arrays - MapReduce - [mail # user]
...for the timeout problem,you can use a background thread that invoke context.progress() timely which do "keep-alive" for forked Child(mapper/combiner/reducer)... it is tricky but works.  ...
   Author: Zizon Qiu, 2012-05-05, 14:36
Re: CompressionCodec in MapReduce - MapReduce - [mail # user]
...It is possible but a little tricky.  As I mention before,write a custom InputFormat and the associate RecordReader.  On Wed, Apr 11, 2012 at 5:23 PM, Grzegorz Gunia wrote:  ...
   Author: Zizon Qiu, 2012-04-11, 14:05
Re: Question on how to get input file name in MapReduce app - MapReduce - [mail # user]
...You may grep it from the Context object that passed to map/reduce/setup/cleanup method.  context.getInputSplit() return a InputSplit object which ,in most of the case ,is type of FileIn...
   Author: Zizon Qiu, 2012-03-17, 12:57
Re: file distribution - MapReduce - [mail # user]
...It may trigger a IOException and causing the current reduce task on that node fails,then the jobtracker will try assign that task to the other node.  not quite sure.  On Tue, Jan 1...
   Author: Zizon Qiu, 2012-01-10, 10:43
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