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Re: Assignment of data splits to mappers - HDFS - [mail # user]
...Hey John,  I don't see the similarity. If you take the case of a normal record file, such as a text file, you read data from the next block. That is, n-1 blocks are "opened" twice, but ...
   Author: Harsh J, 2013-06-14, 02:14
[HDFS-2572] Unnecessary double-check in DN#getHostName - HDFS - [issue]
...We do a double config.get unnecessarily inside DN#getHostName(...). Can be removed by this patch....
http://issues.apache.org/jira/browse/HDFS-2572    Author: Harsh J, 2013-06-14, 00:12
Re: Reducer not getting called - HDFS - [mail # user]
...You're not using the recommended @Override annotations, and are hitting a classic programming mistake. Your issue is same as this earlier discussion: http://search-hadoop.com/m/gqA3rAaVQ7 (a...
   Author: Harsh J, 2013-06-13, 05:30
Re: Container allocation on the same node - HDFS - [mail # user]
...You can request containers with the local host name as the required host, and perhaps reject and re-request if they aren't designated to be on that one until you have sufficient. This may ta...
   Author: Harsh J, 2013-06-12, 13:15
[expand - 2 more] - Re: - HDFS - [mail # user]
...The $HADOOP_HOME/etc/hadoop/ is the config directory. You can find the *-site.xml, etc. under it, or create a file if it doesn't exist there.  The default XML files aren't supposed to e...
   Author: Harsh J, 2013-06-12, 09:45
Re: New Hadoop Eclipse functionality - HDFS - [mail # user]
...Hi Srimanth,  This is great, I just went over the pages - many thanks for sharing! Does this support hadoop-2 as well?  Note though that the Apache Incubator also hosts a project w...
   Author: Harsh J, 2013-06-11, 07:36
[expand - 1 more] - Re: Why my tests shows Yarn is worse than MRv1 for terasort? - HDFS - [mail # user]
...Not tuning configurations at all is wrong. YARN uses memory resource based scheduling and hence MR2 would be requesting 1 GB minimum by default, causing, on base configs, to max out at 8 (du...
   Author: Harsh J, 2013-06-07, 03:58
Re: Hadoop JARs and Eclipse - HDFS - [mail # user]
...If your goal is to simply build an application, then you can use a Maven project. Why do you require the whole of Hadoop's projects itself on Eclipse when you can simply have the dependencie...
   Author: Harsh J, 2013-06-05, 17:43
Re: YARN servers and ports - HDFS - [mail # user]
...If you're asking in terms of discovering where to communicate at, then basically just the RM scheduler address and port (yarn.resourcemanager.scheduler.address).  The NodeManager addres...
   Author: Harsh J, 2013-06-05, 17:18
Re: Recover dfs/name - HDFS - [mail # user]
...If /tmp/hadoop-user/dfs/namesecondary doesn't exist now, then yes, you need to start over. Try keeping multiple copies and on a location thats off-/tmp (use dfs.name.dir config).  On We...
   Author: Harsh J, 2013-06-05, 10:51
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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