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Re: HDFS performance with an without replication - HDFS - [mail # user]
...Write performance improves with lesser replicas (as a result of synchronous and sequenced write pipelines in HDFS). Reads would be the same, unless you're unable to schedule a rack-local rea...
   Author: Harsh J, 2013-09-15, 18:39
Re: How to speed up Hadoop? - HDFS - [mail # user]
...I'd recommend reading Eric Sammer's "Hadoop Operations" (O'Reilly) book. It goes over a lot of this stuff - building, monitoring, tuning, optimizing, etc..  If your goal is just speed a...
   Author: Harsh J, 2013-09-06, 02:38
Re: How to support the (HDFS) FileSystem API of various Hadoop Distributions? - HDFS - [mail # user]
...Oh and btw, nice utility! :)  On Fri, Sep 6, 2013 at 7:50 AM, Harsh J  wrote:    Harsh J...
   Author: Harsh J, 2013-09-06, 02:26
Re: SNN not writing data fs.checkpoint.dir location - HDFS - [mail # user]
...These configs need to be present at SNN, not at just the NN.  On Thu, Sep 5, 2013 at 11:54 PM, Munna  wrote:    Harsh J...
   Author: Harsh J, 2013-09-05, 18:28
[expand - 3 more] - Re: yarn-site.xml and aux-services - HDFS - [mail # user]
...Please log a JIRA on https://issues.apache.org/jira/browse/YARN (do let the thread know the ID as well, in spirit of http://xkcd.com/979/)  On Thu, Sep 5, 2013 at 11:41 PM, John Lilley ...
   Author: Harsh J, 2013-09-05, 18:13
Re: How to update the timestamp of a file in HDFS - HDFS - [mail # user]
...Murali,  The touchz creates a zero sized file. It does not allow modifying a timestamp like Linux's touch command does, which is what the OP seems to be asking about.  On Thu, Sep ...
   Author: Harsh J, 2013-09-05, 10:07
Re: manage bandwidth resource in YARN - HDFS - [mail # user]
...Do you speak of the MR ShuffleHandler or something just more generic?  I am not aware of such a feature or a JIRA for it yet. We do have support for CPU/Memory resource management, but ...
   Author: Harsh J, 2013-09-05, 03:04
[expand - 1 more] - Re: custom writablecomparable with complex fields - HDFS - [mail # user]
...The easy way is to deserialize each stream into objects, then compare them, pretty much what most of the defaults do.  Comparing without deserializing the whole stream is much faster an...
   Author: Harsh J, 2013-09-01, 16:18
Re: How to change default ports of datanodes in a cluster - HDFS - [mail # user]
...Looking at the hdfs-default.xml should help with such questions: http://hadoop.apache.org/docs/current/hadoop-project-dist/hadoop-hdfs/hdfs-default.xml  The property you need is dfs.dat...
   Author: Harsh J, 2013-08-31, 16:14
Re: InvalidProtocolBufferException while submitting crunch job to cluster - HDFS - [mail # user]
...Your cluster is using HDFS HA, and therefore requires a little more configs than just fs.defaultFS/etc..  You need to use the right set of cluster client configs. If you don't have them...
   Author: Harsh J, 2013-08-31, 16:12
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