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Re: Topology script frequency - HDFS - [mail # user]
...NN refers to the rack topology script/class when a new node joins (i.e. it doesn't have the node's IP already in cache), when it starts up, and (I think) also when you issue -refreshNodes. &...
   Author: Harsh J, 2013-02-20, 20:23
Re: copy chunk of hadoop output - HDFS - [mail # user]
...Hi JM,  I am not sure how "dangerous" it is, since we're using a pipe here, and as you yourself note, it will only last as long as the last bytes have been got and then terminate.  ...
   Author: Harsh J, 2013-02-20, 18:39
Re: Trouble in running MapReduce application - HDFS - [mail # user]
...Oops. I just noticed Hemanth has been answering on a dupe thread as well. Lets drop this thread and carry on there :)  On Tue, Feb 19, 2013 at 11:14 PM, Harsh J  wrote:   &nbs...
   Author: Harsh J, 2013-02-19, 17:45
Re: Namenode failures - HDFS - [mail # user]
...Hi Robert,  Are you by any chance adding files carrying unusual encoding? If its possible, can we be sent a bundle of the corrupted log set (all of the dfs.name.dir contents) to inspect...
   Author: Harsh J, 2013-02-17, 23:08
Re: How to monitor HDFS upgrade status after removal of "dfsadmin -upgradeProgress status" command? - HDFS - [mail # dev]
...Hi Scott,  Is your goal to monitor the metadata upgrade? It can be checked on the web UI.  Before finalization, you can see a message on the top banner on the NN frontpage such as:...
   Author: Harsh J, 2013-02-17, 19:49
Re: executing hadoop commands from python? - HDFS - [mail # user]
...Instead of 'scraping' this way, consider using a library such as Pydoop (http://pydoop.sourceforge.net) which provides pythonic ways and APIs to interact with Hadoop components. There are al...
   Author: Harsh J, 2013-02-17, 14:09
Re: QJM deployment - HDFS - [mail # user]
...Hi Azuryy,  Thanks for your feedback on the docs! I've filed https://issues.apache.org/jira/browse/HDFS-4508 on your behalf to address them. Feel free to file JIRA with documentation co...
   Author: Harsh J, 2013-02-17, 13:24
Re: building from subversion repository - HDFS - [mail # user]
...Hi George,  The error below is your issue:   To build trunk, a protocol buffers (protobuf) compiler installation of version 2.4 at least is required, cause we have that as a depend...
   Author: Harsh J, 2013-02-17, 13:17
Re: How can I limit reducers to one-per-node? - HDFS - [mail # user]
...The suggestion to add a combiner is to help reduce the shuffle load (and perhaps, reduce # of reducers needed?), but it doesn't affect scheduling of a set number of reduce tasks nor does a s...
   Author: Harsh J, 2013-02-11, 05:48
Re: Secondary Sort example error - HDFS - [mail # user]
...The JIRA https://issues.apache.org/jira/browse/MAPREDUCE-2584 should help such cases, if what I speculated above is indeed the case.  On Fri, Feb 8, 2013 at 12:16 AM, Harsh J  wrot...
   Author: Harsh J, 2013-02-07, 18:49
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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