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Re: Not able to run more than one map task - Hadoop - [mail # user]
...You are likely memory/vcore starved in the NM's configs. Increase your yarn.nodemanager.resource.memory-mb andyarn.nodemanager.resource.cpu-vcores configs, or consider lowering theMR jo...
   Author: Harsh J, 2015-04-10, 04:51
Re: CPU utilization in map function - Hadoop - [mail # user]
...Asking the Giraph user lists may be a better way to get your answer:http://giraph.apache.org/mail-lists.htmlOn Sun, Apr 5, 2015 at 1:57 PM, Ravikant Dindokar wrote:Harsh J ...
   Author: Harsh J, 2015-04-08, 02:17
Re: Hadoop and HttpFs - Hadoop - [mail # user]
...You could consider using Oozie (via Hue or direct CLI). Users withHTTPFS access can define and load job descriptors on HDFS, and thenuse Oozie to trigger jobs within the cluster (the job des...
   Author: Harsh J, 2015-04-08, 02:11
[HADOOP-7781] Remove RecordIO - Hadoop - [issue]
...HADOOP-6155 deprecated RecordIO in 0.21. We should remove it from trunk, as nothing anymore uses it and the tests are taking up resources.We should attempt to remove record IO and also check...
http://issues.apache.org/jira/browse/HADOOP-7781    Author: Harsh J, 2015-03-28, 02:11
Re: Linux Container Executor (LCE) vs Default Container Executor(DCE) - Hadoop - [mail # user]
...This is incorrect. The DCE executes as the NodeManager process user ('yarn'typically), and the LCE in non-secure mode by default runs only as 'nobody'(or arbitrary static user) unless asked ...
   Author: Harsh J, 2015-03-26, 18:33
Re: Swap requirements - Hadoop - [mail # user]
...The suggestion (regarding swappiness) is not for disabling swap as much asit is to 'not using swap (until really necessary)'. When you run a constantmemory-consuming service such as HBase yo...
   Author: Harsh J, 2015-03-25, 22:28
Re: namenode recovery - Hadoop - [mail # user]
...Not automatically. You'd need to copy over the VERSION and fsimage* filesfrom your SecondaryNN's checkpoint directory over to the new NameNode'sconfigured name directory to start it back up ...
   Author: Harsh J, 2015-03-25, 22:25
Re: Identifying new files on HDFS - Hadoop - [mail # user]
...Look at timestamps of the file? HDFS maintains both mtimes and atimes(latter's not exposed in -ls though).In ETL context, a simple workflow system also resolves this. You have anincoming dir...
   Author: Harsh J, 2015-03-25, 21:27
Re: Can block size for namenode be different from wdatanode block size? - Hadoop - [mail # user]
...does not use this parameterActually, as a configuration, its only relevant to the client. See alsohttp://www.quora.com/How-do-I-check-HDFS-blocksize-default-customOther points sound about ri...
   Author: Harsh J, 2015-03-25, 21:21
[HADOOP-9461] JobTracker and NameNode both grant delegation tokens to non-secure clients - Hadoop - [issue]
...If one looks at the MAPREDUCE-1516 added logic in JobTracker.java's isAllowedDelegationTokenOp() method, and apply non-secure states of UGI.isSecurityEnabled == false and authMethod == SIMPL...
http://issues.apache.org/jira/browse/HADOOP-9461    Author: Harsh J, 2015-03-25, 10:42
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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