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Re: monitor the hadoop cluster - Hadoop - [mail # user]
...The job detail page from the jobtracker shows a lot of information about any given job: the start/finish times of each task and various counters (like time spent in various phase, the input/...
   Author: Luke Lu, 2010-11-11, 20:31
Re: is there any way to set the niceness of map/reduce jobs - Hadoop - [mail # user]
...nice(1) only changes cpu scheduling priority. It doesn't really help if you have tasks (and their child processes) that use too much memory, which causes swapping, which is probably the real...
   Author: Luke Lu, 2010-11-03, 01:17
[expand - 4 more] - Re: load a serialized object in hadoop - Hadoop - [mail # user]
...Just took a look at the bin/hadoop of your particular version (http://svn.apache.org/viewvc/hadoop/common/tags/release-0.19.2/bin/hadoop? revision=796970&view=markup). It looks like that HAD...
   Author: Luke Lu, 2010-10-14, 00:04
Re: how to set diffent VM parameters for mappers and reducers? - Hadoop - [mail # user]
...For 0.20.x, you can specify java opts for your tasks with:  mapred.child.java.opts for all tasks mapred.map.child.java.opts (mapreduce.map.java.opts for 0.21+) for maps mapred.reduce.ch...
   Author: Luke Lu, 2010-10-12, 18:43
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Luke Lu
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