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[expand - 1 more] - Re: YARN Pi example job stuck at 0%(No MR tasks are started by ResourceManager) - Hadoop - [mail # user]
...Yes, do ensure that JAVA_HOME is properly set on all nodes through hadoop env or the login shell.  Regarding agregated logs,  they will be found in hdfs under the directory set thr...
   Author: Rahul Jain, 2012-07-31, 03:44
Re: Hive Thrift help - Hadoop - [mail # user]
...I am assuming you read thru:  https://cwiki.apache.org/Hive/hiveserver.html  The server comes up on port 10,000 by default, did you verify that it is actually listening on the port...
   Author: Rahul Jain, 2012-04-16, 21:18
Re: Map Task Capacity Not Changing - Hadoop - [mail # user]
...You might be suffering from HADOOP-7822; I'd suggest you verify your pid files and fix the problem by hand if it is the same issue.  -Rahul  On Fri, Dec 16, 2011 at 2:40 PM, Joey K...
   Author: Rahul Jain, 2011-12-16, 23:40
Re: How do I connect Java Visual VM to a remote task? - Hadoop - [mail # user]
...The easy way to debug such problems in our experience is to use 'jmap' to take a few snapshots of one of the tasktrackers (child tasks) and analyze them under a profiler tool such as jprofil...
   Author: Rahul Jain, 2011-10-17, 19:53
Re: ChainMapper and ChainReducer: Are the key/value pairs distributed to the nodes of the cluster before each Map phase? - Hadoop - [mail # user]
...Your latter statement is correct:  to Map2 phase (or Map3 Phase) within the same node, without any distribution.  ChainMappers / ChainReducers are just convenience classes to allow...
   Author: Rahul Jain, 2011-04-29, 18:55
Re: Reduce java.lang.OutOfMemoryError - Hadoop - [mail # user]
...If you google for such memory failures, you'll find the mapreduce tunable that'll help you:  mapred.job.shuffle.input.buffer.percent ; it is well known that the default values in hadoop...
   Author: Rahul Jain, 2011-02-16, 19:58
Re: Help: How to increase amont maptasks per job ? - Hadoop - [mail # user]
...Also make sure you've enough input files for the next stage mappers to work with...  Read thru the input splits part of tutorial: http://wiki.apache.org/hadoop/HadoopMapReduce  If ...
   Author: Rahul Jain, 2011-01-07, 21:37
Re: Can MapReduce run simultaneous producer/consumer processes? - Hadoop - [mail # user]
...In case the producer / consumer don't require sorting to happen, take a loo k at ChainMapper:  http://hadoop.apache.org/common/docs/r0.20.1/api/org/apache/hadoop/mapred/l ib/ChainMapper...
   Author: Rahul Jain, 2011-01-07, 00:42
Re: How to build multiple inverted indexes? - Hadoop - [mail # user]
...Hadoop does not prevent you from writing key value pair multiple times in the same map iteration if that is what is your roadblock.  You can call collector.collect() multiple times with...
   Author: Rahul Jain, 2010-07-29, 17:53
[expand - 2 more] - Re: reading distributed cache returns null pointer - Hadoop - [mail # user]
...The DistributedCache behavior is not symmetrical in local mode vs distributed mode.  As I replied earlier, you need to use  DistributedCache.getCacheFiles() in distributed mode. &n...
   Author: Rahul Jain, 2010-07-10, 23:12
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