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Re: Hadoop 2.0.4: Unable to load native-hadoop library for your platform - MapReduce - [mail # user]
...The native libraries packed in a binary tarball of 2.0.4 may not apply to all OSes and architectures. You will need to build your own native libraries to make sure they are appropriate for y...
   Author: Harsh J, 2013-05-24, 06:24
Re: pauses during startup (maybe network related?) - MapReduce - [mail # user]
...You are spot on about the DNS lookup slowing things down. I've faced the same issue (before I had a local network DNS set up for the WiFi network I use).   There's a few configs you nee...
   Author: Harsh J, 2013-05-24, 05:29
Re: Task attempt failed after TaskAttemptListenerImpl ping - MapReduce - [mail # user]
...Assuming you mean "failed" there instead of "filed".  In MR, a ping message is sent over the TaskUmbilicalProtocol from the Task container to the MR AM. A ping is only sent as an altern...
   Author: Harsh J, 2013-05-24, 05:24
Re: SequenceFile sync marker uniqueness - MapReduce - [mail # user]
...SequenceFiles use a 16 digit MD5 (computed based on a UID and writer ~init time, so pretty random). For the rest of my answer, I'll prefer not to repeat what Martin's already said very well ...
   Author: Harsh J, 2013-05-23, 19:53
Re: HDFS data and non-aligned splits - MapReduce - [mail # user]
...on block boundaries?  Answer depends on the file format used here. With any of the formats we ship, nothing happens.  boundaries, resulting in an extra HDFS connection just to get ...
   Author: Harsh J, 2013-05-23, 19:09
Re: Hadoop Rack awareness on virtual system - MapReduce - [mail # user]
...An example topology file and script is available on the Wiki at http://wiki.apache.org/hadoop/topology_rack_awareness_scripts   On Thu, May 23, 2013 at 8:38 PM, Jitendra Yadav wrote: &n...
   Author: Harsh J, 2013-05-23, 15:30
Re: dncp_block_verification log - MapReduce - [mail # user]
...Hi,  What is your HDFS version? I vaguely remember this to be a problem in the 2.0.0 version or so where there was also a block scanner excessive work bug, but I'm not sure what fixed i...
   Author: Harsh J, 2013-05-23, 12:24
Re: How to handle multiline record for inputsplit? - MapReduce - [mail # dev]
...If your record is variably multi-line, then quite logically the newline character cannot be its "record delimiter". Use the right character or byte(s)/info that defines the real "record deli...
   Author: Harsh J, 2013-05-21, 06:28
Re: Pluggable Block placement policy - MapReduce - [mail # user]
...Hi Mohammad,  I believe we've already answered this earlier to an almost exact question: http://search-hadoop.com/m/b8FAa2eI6kj1. Does that not suffice? Is there something more specific...
   Author: Harsh J, 2013-05-20, 07:09
[expand - 1 more] - Re: recursive list in java without block - MapReduce - [mail # user]
...Hi Kun,  So I think I was incorrect as I only checked the 0.20/1.0 APIs.  We do have optimal recursive listing support in 2.0 for both FileContext and FileSystem APIs: http://hadoo...
   Author: Harsh J, 2013-05-17, 09:52
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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