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Re: Fault tolerance and Speculative Execution - HDFS - [mail # user]
...The finer grained controls are available in 2.x MR2 today. Pretty sure they weren't deprecated/removed, but may have been replaced by better names.  On Thu, Jul 18, 2013 at 11:07 PM, Ge...
   Author: Harsh J, 2013-07-19, 02:03
Re: QJM for federation - HDFS - [mail # user]
...Yeah ideally you needn't configure a local edits directory, unless you want extra safety. There was an issue where it still gets configured and logs local edits though but am not sure if thi...
   Author: Harsh J, 2013-07-17, 09:17
Re: Can I move block data directly? - HDFS - [mail # dev]
...Eitan,  The block to host mapping isn't persisted in the metadata. This is also the reason why the steps include a restart, which will re-trigger a block report (and avoid gotchas) that...
   Author: Harsh J, 2013-07-09, 00:50
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
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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