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Re: File requests to Namenode - Hadoop - [mail # user]
...You could look at metrics the NN publishes, or look at/process theHDFS audit log.On Wed, Apr 9, 2014 at 6:36 PM, Diwakar Sharma  wrote:Harsh J ...
   Author: Harsh J, 2014-04-10, 01:23
Re: MapReduce for complex key/value pairs? - Hadoop - [mail # user]
...Yes, you can write custom writable classes that detail and serialiseyour required data structure. If you have Hadoop: The DefinitiveGuide, checkout its section "Serialization" under chapter ...
   Author: Harsh J, 2014-04-08, 18:31
Re: Hadoop v1.8 data transfer protocol - Hadoop - [mail # dev]
...There's been no Apache Hadoop release versioned v1.8 historically, noris one upcoming. Do you mean 0.18?Either way, can you point to the specific code lines in BlockSenderwhich have you conf...
   Author: Harsh J, 2014-04-07, 02:00
Re: customize containter-log4j.properties - Hadoop - [mail # user]
...This is intentional, and only within MR2's scope - we do not supportconfiguring the formatting, but do support switching the levels (viajob properties). You should still be able to customise...
   Author: Harsh J, 2014-04-05, 17:14
[expand - 1 more] - Re: Why block sizes shown by 'fsck' and '-stat' are inconsistent? - Hadoop - [mail # user]
...The block size is a meta attribute. If you append to the file later,it still needs to know when to split further - so it keeps that valueas a mere metadata it can use to advise itself on wri...
   Author: Harsh J, 2014-04-05, 17:04
Re: Hadoop Serialization mechanisms - Hadoop - [mail # user]
...- You can override the RPC serialisation module and engine with acustom class if you wish to, but it would not be trivial task.- You can easily use custom data serialisation modules for I/O....
   Author: Harsh J, 2014-03-30, 21:08
Re: Does hadoop depends on ecc memory to generate checksum for data stored in HDFS - Hadoop - [mail # user]
...While the HDFS functionality of computing, storing and validatingchecksums for block files does not specifically _require_ ECC, you do_want_ ECC to avoid frequent checksum failures.This is n...
   Author: Harsh J, 2014-03-28, 10:00
Re: How to run data node block scanner on data node in a cluster from a remote machine? - Hadoop - [mail # user]
...Hello Reena,No there isn't a programmatic way to invoke the block scanner. Notethough that the property to control its period is DN-local, so you canchange it on DNs and do a DN rolling rest...
   Author: Harsh J, 2014-03-28, 09:54
Re: mapred job -list error - Hadoop - [mail # user]
...Please also indicate your exact Hadoop version in use.On Fri, Mar 28, 2014 at 9:04 AM, haihong lu  wrote:Harsh J ...
   Author: Harsh J, 2014-03-28, 07:38
Re: How to get locations of blocks programmatically? - Hadoop - [mail # user]
...Yes, use http://hadoop.apache.org/docs/stable2/api/org/apache/hadoop/fs/FileSystem.html#getFileBlockLocations(org.apache.hadoop.fs.Path,long, long)On Fri, Mar 28, 2014 at 7:33 AM, Libo Yu &n...
   Author: Harsh J, 2014-03-28, 07:36
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