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Re: modify hdfs block size - MapReduce - [mail # user]
...You cannot change the blocksize (i.e. merge or split) of an existing file. You can however change it for newer files, and also download and re-upload older files again with newer blocksize t...
   Author: Harsh J, 2013-09-10, 04:15
Re: Questions about BlockPlacementPolicy - MapReduce - [mail # user]
...In HDFS, currently, the replication factor is a file-level property and can't be controlled at a block level (at least on the metadata end).  On Tue, Sep 10, 2013 at 5:38 AM, ivan zhang...
   Author: Harsh J, 2013-09-10, 04:14
Re: Hadoop on IPv6 - MapReduce - [mail # user]
...For Hadoop JVMs, generally speaking, need to have the following in your hadoop-env.sh for HADOOP_OPTS:  export HADOOP_OPTS="-Djava.net.preferIPv4Stack=true $HADOOP_OPTS"  We also s...
   Author: Harsh J, 2013-09-09, 20:55
Re: Hadoop is hardcoded the prot into 8020 - MapReduce - [mail # user]
...Hi,  What port did you reconfigure it to, how did you do it, and what was the error you observed?  On Sun, Sep 8, 2013 at 11:10 AM, raju nair  wrote:    Harsh J...
   Author: Harsh J, 2013-09-08, 06:11
Re: Increasing Java Heap Space in Slave Nodes - MapReduce - [mail # user]
...You can pass that config set as part of your job (jobConf.set(…) or job.getConfiguration().set(…)). Alternatively, if you implement Tool, and use its grabbed Configruation, you can also pass...
   Author: Harsh J, 2013-09-07, 09:54
[expand - 1 more] - Re: Disc not equally utilized in hdfs data nodes - MapReduce - [mail # user]
...The spaces may be a problem if you are using the older 1.x releases. Please try to specify the list without spaces, and also check if all of these paths exist and have some DN owned director...
   Author: Harsh J, 2013-09-05, 17:50
Re: How to update the timestamp of a file in HDFS - MapReduce - [mail # user]
...There's no shell command (equivalent to Linux's touch) but you can use the Java API: http://hadoop.apache.org/docs/current/api/org/apache/hadoop/fs/FileSystem.html#setTimes(org.apache.hadoop...
   Author: Harsh J, 2013-09-05, 05:36
Re: Hadoop Yarn - MapReduce - [mail # user]
...This is sorta a regression with YARN+MR2. In MR1 we've had the administrative ability to lock down changes to mapred.child.java.opts on a per node basis, as Tasks would load the TT config an...
   Author: Harsh J, 2013-09-04, 06:08
Re: yarn-site.xml and aux-services - MapReduce - [mail # user]
...We could class-load directly from HDFS, like HBase Co-Processors do.   Isn't this more complex than just running a dedicated service all the time, and/or implementing a way to spawn/end...
   Author: Harsh J, 2013-09-04, 06:05
Re: forbid use of hadoop.job.ugi to impersonate user without Kerberos - MapReduce - [mail # user]
...No.  There are several ways a user can impersonate another user if you do not use strong authentication (i.e. kerberos). Some ways are implemented with that intention, for users who don...
   Author: Harsh J, 2013-09-04, 05:32
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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