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Re: Hadoop upgrade - HDFS - [mail # user]
...The link Jitendra provided lists all the changes exhaustively. What are you exactly looking for beyond that? For Performance related changes, they are probably noted, so just search the same...
   Author: Harsh J, 2013-08-09, 14:34
Re: MutableCounterLong metrics display in ganglia - HDFS - [mail # user]
...The counter, being num-ops, should up-count and not reset. Note that your test may be at fault though - calling hsync may not always call NN#fsync(…) unless you are passing the proper flags ...
   Author: Harsh J, 2013-08-09, 14:06
Re: Discrepancy in the values of consumed disk space by hadoop - HDFS - [mail # user]
...There isn't a "discrepancy", but read on: DFS Used counts disk spaces across DNs. FSCK counts file lengths on HDFS. The former includes replicated data sizes, plus block checksum metadata co...
   Author: Harsh J, 2013-08-09, 14:04
Re: Why LineRecordWriter.write(..) is synchronized - HDFS - [mail # user]
...I suppose I should have been clearer. There's no problem out of box if people stick to the libraries we offer :)  Yes the LRW was marked synchronized at some point over 8 years ago [1] ...
   Author: Harsh J, 2013-08-09, 01:46
Re: load properties from property file into Configuration object - HDFS - [mail # user]
...This is a bit unnecessary to manually do. If you use the Tool framework, then you can pass -Dkey=val props directly into a config object at runtime. See http://hadoop.apache.org/docs/stable/...
   Author: Harsh J, 2013-08-03, 12:20
Re: some questions about HA and secondary name node - HDFS - [mail # user]
...Hi,  On Wed, Jul 31, 2013 at 7:03 AM, ch huang  wrote:  With HA setup, you do not need to run the SecondaryNameNode daemon.   The Standby state NameNode automatically beh...
   Author: Harsh J, 2013-07-31, 02:18
Re: Suspecting Namenode Filesystem Corrupt!! - HDFS - [mail # user]
...What do you mean by you "can't get back a result"? The command hangs, errors out, gives an incorrect result, what does it do? Can you post your error please? On Jul 30, 2013 1:31 AM, "Sathis...
   Author: Harsh J, 2013-07-30, 02:42
Re: Error on running a hadoop job - HDFS - [mail # user]
...You could see this if you had removed away /wordcount_raw/ when the reducer was running perhaps. Otherwise the path had an attempt ID so am not seeing how it could have had two writers confl...
   Author: Harsh J, 2013-07-29, 18:19
Re: problem about starting datanode - HDFS - [mail # user]
...You have one datanode data volume (dfs.datanode.data.dir) configured, but you've specified tolerated failures as 3. The state of 3 > 1 is invalid and hence the error. You cannot enable di...
   Author: Harsh J, 2013-07-26, 05:48
Re: issure about create fence method - HDFS - [mail # user]
...The fencing happens at the NameNodes, so I guess just on the two NNs should suffice.  On Fri, Jul 26, 2013 at 6:26 AM, ch huang  wrote:    Harsh J...
   Author: Harsh J, 2013-07-26, 03:02
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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