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Does the map task push map output to reduce task or reduce task pull it from map task - Hadoop - [mail # user]
...Hi all,  I'd like to know does the map task push map output to reduce task or reduce task pull it from map task ? Which way is real in hadoop ?  Thank you very much.   Jeff zh...
   Author: Jeff Zhang, 2009-10-27, 01:05
Do I need some distributed computing algorithm if I want to deep into source code of hadoop ? - Hadoop - [mail # user]
...Hi all,  These days, I begin look into source code hadoop. And I want to know whether I need some distributed computing algorithm if I want to deep into source code of hadoop ?   T...
   Author: Jeff Zhang, 2009-10-21, 15:16
[expand - 1 more] - Re: help with Hadoop custom Writable types implementation - Hadoop - [mail # user]
...agree, you'd better make all the fields implement Writable.  and then call their read write in your read write function.    On Thu, Oct 15, 2009 at 3:53 PM, Eason.Lee  wr...
   Author: Jeff Zhang, 2009-10-15, 08:31
Re: Reading files from local file system - Hadoop - [mail # general]
...Maybe you could debug your mapreduce job in eclipse, since you run it in local mode.    On Tue, Oct 13, 2009 at 5:56 AM, Chandan Tamrakar  wrote:  ...
   Author: Jeff Zhang, 2009-10-13, 13:49
Re: How can I run such a mapreduce program? - Hadoop - [mail # user]
...I do not think you can run jar compiled with hadoop 0.20.1 on hadoop 0.18.3  They are not compatible.    2009/10/13 杨卓荦   on 邮箱贺卡全新上线� ��...
   Author: Jeff Zhang, 2009-10-13, 03:06
Re: Parallel data stream processing - Hadoop - [mail # user]
...I snuggest you to use pig to handle your problem.  Pig is a sub-project of hadoop.  And you do not need to worry about the boundary problem. Actually hadoop handle that for you. &n...
   Author: Jeff Zhang, 2009-10-10, 08:50
[expand - 1 more] - Re: Does hadoop 0.18.3 support thrift ? - Hadoop - [mail # user]
...But I do not found the thrift in hadoop 0.18.3. Can I use other version of hadoop's thrift for my cluster which is built upon hadoop 0.18.3   On Wed, Sep 30, 2009 at 1:56 AM, Todd Lipco...
   Author: Jeff Zhang, 2009-09-30, 03:11
[expand - 1 more] - Re: Can not stop hadoop cluster ? - Hadoop - [mail # user]
...My cluster has running for several months.  Is this a bug of hadoop? I think hadoop is supposed to run for long time.  And will I lose data if I manually kill the process ?   ...
   Author: Jeff Zhang, 2009-09-21, 06:45
Re: Copying directories out of HDFS - Hadoop - [mail # user]
...Hi Arvind,  You miss the fs  The command should be:  bin/hadoop fs -get /path/to/dfs/dir  /path/to/local/dir or bin/hadoop fs -copyToLocal /path/to/dfs/dir  /path/to...
   Author: Jeff Zhang, 2009-09-05, 04:49
Re: Hadoop - Hadoop - [mail # user]
...You should set JAVA_HOME like this:  export JAVA_HOME=C:/cygwin/home/HadoopAdmin/java    On Fri, Sep 4, 2009 at 1:06 AM, Rajpal, Harjeet Kumar  wrote:  ...
   Author: Jeff Zhang, 2009-09-04, 13:24
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NEW: Monitor These Apps!
elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB