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Re: not able to run map reduce job example on aws machine - Hadoop - [mail # user]
..."java.lang.IllegalArgumentException: Does not contain a validhost:port authority: poc_hadoop04:46162"Hostnames cannot carry an underscore '_' character per RFC 952 and itsextensions. Please ...
   Author: Harsh J, 2014-04-10, 13:41
Re: Hadoop 2.2.0-cdh5.0.0-beta-1 - MapReduce Streaming - Failed to run on a larger jobs - Hadoop - [mail # user]
...It appears to me that whatever chunk of the input CSV files your maptask 000149 gets, the program is unable to process it and throws anerror and exits.Look into the attempt_1395628276810_006...
   Author: Harsh J, 2014-04-10, 06:32
Re: use setrep change number of file replicas,but not work - Hadoop - [mail # user]
...The replica deletion is asynchronous. You can track its deletions viathe NameNode's over-replicated blocks and the pending delete metrics.On Thu, Apr 10, 2014 at 7:16 AM, ch huang  wrot...
   Author: Harsh J, 2014-04-10, 02:51
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
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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