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Re: Mysterious 7 byte reads from .meta files - HDFS - [mail # dev]
...The header of the meta file is read for block metadata version validation. The checksum checks are performed after the header is read (and skipped if the config's so). The code can be viewed...
   Author: Harsh J, 2013-07-07, 16:06
Re: Exception in createBlockOutputStream - poss firewall issue - HDFS - [mail # user]
...Dunno on top of my head if its present in your version (grep sources perhaps), but there are properties dfs.client.use.datanode.hostname, dfs.datanode.use.datanode.hostname, dfs.datanode.dns...
   Author: Harsh J, 2013-07-03, 08:29
[HDFS-4936] Handle overflow condition for txid going over Long.MAX_VALUE - HDFS - [issue]
...Hat tip to Fengdong Yu for the question that lead to this (on mailing lists).I hacked up my local NN's txids manually to go very large (close to max) and decided to try out if this causes an...
http://issues.apache.org/jira/browse/HDFS-4936    Author: Harsh J, 2013-06-26, 02:01
Re: A question for txid - HDFS - [mail # dev]
...Yes, it logically can if there have been as many transactions (its a very very large number to reach though).  Long.MAX_VALUE is (2^63 - 1) or 9223372036854775807.  I hacked up my ...
   Author: Harsh J, 2013-06-25, 13:14
Re: How can a YarnTask read/write local-host HDFS blocks? - HDFS - [mail # user]
...Hi,  On Sat, Jun 22, 2013 at 4:21 PM, blah blah  wrote:  The HDFS client does local reads automatically if there is a local DN where they are running (and it has the block the...
   Author: Harsh J, 2013-06-22, 11:32
[expand - 1 more] - Re: dfs.datanode.socket.reuse.keepalive - HDFS - [mail # dev]
...Thanks Colin!  On Mon, Jun 17, 2013 at 11:39 PM, Colin McCabe  wrote:    Harsh J...
   Author: Harsh J, 2013-06-18, 02:50
Re: how to close hadoop when tmp files were cleared - HDFS - [mail # user]
...Just send the processes a SIGTERM signal (regular kill). Its what the script does anyway. Ensure to change the PID directory before the next restart though.  On Mon, Jun 17, 2013 at 1:0...
   Author: Harsh J, 2013-06-17, 08:34
Re: how to get the mapreduce code which was pig/hive script translated to? - HDFS - [mail # user]
...This is a question for the Hive/Pig lists to answer best.  Note though that they only compile a plan, not the code. The code is available already, the compiled plan just structures the ...
   Author: Harsh J, 2013-06-16, 15:08
Re: Block deletion after benchmarks - HDFS - [mail # dev]
...Eitan,  I don't completely get your question. TestDFSIO is a test that will create several files for testing the IO and then delete it at the end of the test.  Block deletions in H...
   Author: Harsh J, 2013-06-16, 14:28
Re: how to design the mapper and reducer for the below problem - HDFS - [mail # user]
...Hey Parnab,  Please checkout Giraph (http://giraph.apache.org), which should help you develop a program to solve this.  On Fri, Jun 14, 2013 at 10:11 AM, parnab kumar  wrote: ...
   Author: Harsh J, 2013-06-14, 09:39
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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