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[MAPREDUCE-3839] Improve the single node setup docs for MR - MapReduce - [issue]
...I'm gonna be recording all nits I can about the page at http://hadoop.apache.org/common/docs/r0.23.0/hadoop-yarn/hadoop-yarn-site/SingleCluster.html here: The section at http://hadoop.apache...
http://issues.apache.org/jira/browse/MAPREDUCE-3839    Author: Harsh J, 2014-01-31, 05:30
Re: how to set org.apache.hadoop classpath? - MapReduce - [mail # dev]
...The imports referenced in your error come from the hadoop-common jar,and won't be present in the hadoop-mapreduce-client-core jar.The most ideal way to set your compile classpath would be to...
   Author: Harsh J, 2014-01-27, 22:21
Re: How to start historyserver on all nodes automatically? - MapReduce - [mail # user]
...Hi,  You do not need to run an MR HistoryServer on all nodes. If you want "start-yarn.sh" to cover the history server startup you can also inject the command at its end.  On Tue, J...
   Author: Harsh J, 2014-01-21, 11:00
[MAPREDUCE-2584] Check for serializers early, and give out more information regarding missing serializers - MapReduce - [issue]
...As discussed on HADOOP-7328, MapReduce can handle serializers in a much better way in case of bad configuration, improper imports (Some odd Text class instead of the Writable Text set as key...
http://issues.apache.org/jira/browse/MAPREDUCE-2584    Author: Harsh J, 2014-01-20, 06:09
Re: Hadoop C++ HDFS test running Exception - MapReduce - [mail # user]
...I've found in past that the native code runtime somehow doesn't support wildcarded classpaths. If you add the jars explicitly to the CLASSPATH, your app will work. You could use a simple she...
   Author: Harsh J, 2014-01-14, 02:39
Re: Error in starting DFS - message says JAVA_HOME not set though the workstation has working java - MapReduce - [mail # user]
...You'll need to set JAVA_HOME under the $HADOOP_CONF_DIR/hadoop-env.sh explicitly. This variable is not a system global one.  On Fri, Jan 10, 2014 at 7:17 AM, srinivas  wrote:  ...
   Author: Harsh J, 2014-01-10, 04:22
Re: Wordcount Hadoop pipes C++ Running issue - MapReduce - [mail # user]
...Hello,  Do you have a proper MR cluster configured? Does your hadoop-1.2.1/bin/conf/mapred-site.xml point mapred.job.tracker to a specific hostname and port, and a JT+TT is running? &nb...
   Author: Harsh J, 2014-01-10, 02:17
Re: Block size - MapReduce - [mail # user]
...XG,  The newer default is 128 MB [HDFS-4053]. The minimum, however, can be as low as io.bytes.per.checksum (default: 512 bytes) if the user so wishes it. To administratively set a limit...
   Author: Harsh J, 2014-01-04, 07:23
Re: Reduce task hang[EMERGENCE] - MapReduce - [mail # user]
...Hi again,  I did not mention the TaskTracker log, but the actual Task JVM's syslog/stderr/stdout. Do those log *any* problems at all?  On Fri, Jan 3, 2014 at 11:16 AM, Azuryy Yu &n...
   Author: Harsh J, 2014-01-03, 05:59
Re: Job fails while re attempting the task in multiple outputs case - MapReduce - [mail # user]
...Are you using the MultipleOutputs class shipped with Apache Hadoop or one of your own?  If its the latter, please take a look at gotchas to take care of described at http://wiki.apache....
   Author: Harsh J, 2013-12-30, 14:12
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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