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[expand - 3 more] - Re: How to rebuild Hadoop ?? - Hadoop - [mail # user]
...Matthew,  InputFormat will been used in client side, so you should combine the hadoop-0.20.2.jar and hadoop-example.jar into one single jar    On Wed, Sep 8, 2010 at 2:58 AM, ...
   Author: Jeff Zhang, 2010-09-08, 10:27
Re: change HDFS block size - Hadoop - [mail # user]
...Those lagacy files won't change block size (NameNode have the mapping between block and file) only the new added files will have the block size of 128m    On Tue, Sep 7, 2010 at 7:...
   Author: Jeff Zhang, 2010-09-08, 03:03
[expand - 1 more] - Re: where distributed cache start working - Hadoop - [mail # dev]
...Do you debug it using LocalJobRunner ? In local mode, TaskRunner won't been called. In local mode, mapper task runs in thread rather than forked jvm. The TaskRunner only been called in distr...
   Author: Jeff Zhang, 2010-08-23, 04:47
[expand - 1 more] - Re: [Input split] File manipulation - Hadoop - [mail # user]
...The default split size is 64M which is the block size, and you can change it by configuration. What file type of your input file ? if it's gz , it can not been spited, and you will always ge...
   Author: Jeff Zhang, 2010-08-18, 01:37
Re: hadoop RPC Server and Client - Hadoop - [mail # user]
...There's heartbeat between jobtracker and tasktracker, namenode and datanode. Besides, tasktracker will report task progress info to jobtracker, and datanode will report block report to namen...
   Author: Jeff Zhang, 2010-08-13, 01:21
Re: MapReduce Usage in Search Engines - Hadoop - [mail # dev]
...As my understanding, google may use mapred to build index, but won't use mapred in the search phase. Because search phase need to be low latency which is not mapred's feature.   On Fri,...
   Author: Jeff Zhang, 2010-07-30, 14:18
[expand - 1 more] - Re: From X to Hadoop MapReduce - Hadoop - [mail # user]
...Cool, James. I am very interested to contribute to this. I think group by, join and order by can been added to the examples.   On Thu, Jul 22, 2010 at 4:59 AM, James Seigel  wrote:...
   Author: Jeff Zhang, 2010-07-22, 01:22
Re: Hadoop:Pig: Update column value - Hadoop - [mail # user]
...Hi John,  It would be better if you ask the question in pig user mail list. And paste your pig script and any udf.    On Wed, Jul 7, 2010 at 7:39 AM, John Seer  wrote: &n...
   Author: Jeff Zhang, 2010-07-07, 01:06
Re: copy files to HDFS protocols - Hadoop - [mail # user]
...1. You can use mount the files on another machine to your local machine, and invoke the copyFromLocal 2. Sure, you can write stream to HDFS, but I'm afraid you have to use Java API of hadoop...
   Author: Jeff Zhang, 2010-06-30, 09:19
Re: Can we modify files in HDFS? - Hadoop - [mail # general]
...You can not modify file in HDFS, HDFS is designed for write once, read many times.    On Tue, Jun 29, 2010 at 8:29 AM, elton sky  wrote:    Best Regards  Jeff Z...
   Author: Jeff Zhang, 2010-06-29, 01:50
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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