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Re: Recover dfs/name - HDFS - [mail # user]
...If /tmp/hadoop-user/dfs/namesecondary doesn't exist now, then yes, you need to start over. Try keeping multiple copies and on a location thats off-/tmp (use dfs.name.dir config).  On We...
   Author: Harsh J, 2013-06-05, 10:51
Re: possible to change replication factor at file creation time (with copyFromLocal)? - HDFS - [mail # user]
...Hi Julian,  Yes, "dfs" subcommand accepts config overrides via -D. Just do "hadoop dfs -Ddfs.replication=X -copyFromLocal …".  On Fri, May 31, 2013 at 10:27 PM, Julian Bui  wr...
   Author: Harsh J, 2013-05-31, 17:03
Re: splittable vs seekable compressed formats - HDFS - [mail # user]
...SequenceFiles should be seekable provided you know/manage their sync points during writes I think. With LZO this may be non-trivial.  On Thu, May 23, 2013 at 11:01 PM, John Lilley  ...
   Author: Harsh J, 2013-05-24, 06:52
Re: Is there a way to limit # of hadoop tasks per user at runtime? - HDFS - [mail # user]
...The only pain point I'd find with CS in a multi-user environment is its limitation of using queue configs. Its non-trivial to configure a queue per user as CS doesn't provide any user level ...
   Author: Harsh J, 2013-05-23, 18:24
[HDFS-4224] The dncp_block_verification log can be compressed - HDFS - [issue]
...On some systems, I noticed that when the scanner runs, the dncp_block_verification.log.curr file under the block pool gets quite large (several GBs). Although this is rolled away, we could a...
http://issues.apache.org/jira/browse/HDFS-4224    Author: Harsh J, 2013-05-23, 18:02
Re: upgrade from primary + secondary NN to active + standby NN - HDFS - [mail # user]
...FWIW, I've seen through a lot of upgrades from 1.x to 2.x and metadata issue's never been a part of it. You should be able to safely upgrade and then to configure HA. Note that you cannot di...
   Author: Harsh J, 2013-05-22, 04:55
Re: Recovering the namenode from failure - HDFS - [mail # user]
...I think he's mentioned the new NN is the same IP and Hostname as the old one, and uses an actual checkpoint. All he has to do is start the DNs back up again and they should report in fine. &...
   Author: Harsh J, 2013-05-22, 03:46
Re: [VOTE] Plan to create release candidate for 0.23.8 - HDFS - [mail # dev]
...+1  On Sat, May 18, 2013 at 2:40 AM, Thomas Graves  wrote:    Harsh J...
   Author: Harsh J, 2013-05-18, 02:19
Re: Question about writing HDFS files - HDFS - [mail # user]
...Thanks for the clarification Rahul. In that case, then the reading is correct (and that a HDFS client behaves the same, in and out of MR - its not really related to MR at all).  A "clie...
   Author: Harsh J, 2013-05-17, 05:12
[HDFS-1804] Add a new block-volume device choosing policy that looks at free space - HDFS - [issue]
...HDFS-1120 introduced pluggable block-volume choosing policies, but still carries the vanilla RoundRobin as its default.An additional implementation that also takes into consideration the fre...
http://issues.apache.org/jira/browse/HDFS-1804    Author: Harsh J, 2013-05-17, 00:30
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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