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Re: Question about writing HDFS files - HDFS - [mail # user]
...Thanks for the clarification Rahul. In that case, then the reading is correct (and that a HDFS client behaves the same, in and out of MR - its not really related to MR at all).  A "clie...
   Author: Harsh J, 2013-05-17, 05:12
[HDFS-1804] Add a new block-volume device choosing policy that looks at free space - HDFS - [issue]
...HDFS-1120 introduced pluggable block-volume choosing policies, but still carries the vanilla RoundRobin as its default.An additional implementation that also takes into consideration the fre...
http://issues.apache.org/jira/browse/HDFS-1804    Author: Harsh J, 2013-05-17, 00:30
Re: Map Tasks do not obey data locality principle........ - HDFS - [mail # user]
...Also, does your custom FS report block locations in the exact same format as how HDFS does?  On Tue, May 14, 2013 at 4:25 PM, Agarwal, Nikhil  wrote:    Harsh J...
   Author: Harsh J, 2013-05-15, 21:01
[HDFS-3628] The dfsadmin -setBalancerBandwidth command on branch-1 does not check for superuser privileges - HDFS - [issue]
...The changes from HDFS-2202 for 0.20.x/1.x failed to add in a checkSuperuserPrivilege();, and hence any user (not admins alone) can reset the balancer bandwidth across the cluster if they wis...
http://issues.apache.org/jira/browse/HDFS-3628    Author: Harsh J, 2013-05-15, 06:16
Re: 600s timeout during copy phase of job - HDFS - [mail # user]
...Hi David,  A Reduce task's percentage is a good indicator of the phase it is in: First 33% is the COPY phase, 33-66% is the SORT phase and 66-100% is the user-code-progress phase.  ...
   Author: Harsh J, 2013-05-13, 16:42
Re: Install Hadoop on Linux Pseudo Distributed Mode - Root Required? - HDFS - [mail # user]
...Raj,  Apache Hadoop by itself does not require root privileges to run (assuming a non-secure setup). You can run it out of a tarball from a home directory you have on the server machine...
   Author: Harsh J, 2013-05-13, 16:34
Re: Wrapping around BitSet with the Writable interface - HDFS - [mail # user]
...You can perhaps consider using the experimental JavaSerialization [1] enhancement to skip transforming to Writables/other-serialization-formats. It may be slower but looks like you are looki...
   Author: Harsh J, 2013-05-12, 20:09
Re: problem building lzo - HDFS - [mail # user]
...What repo of the hadoop-lzo are you using? If you're using a typical Linux OS such as those similar to RedHat/Debian/etc., it is easier to run the "hadoop-lzo-packager" project mentioned at ...
   Author: Harsh J, 2013-05-09, 03:45
Re: How to restore HDFS data - HDFS - [mail # user]
...If you've already run -delete (-move is a better choice if you know DN fault is temporary), then the missing blocks are already deleted from the namespace permanently. No way to recover the ...
   Author: Harsh J, 2013-05-02, 13:19
Re: datanode's write_block_op_avg_time value - HDFS - [mail # user]
...What are you finding alarming w.r.t. your cluster?  The metric is simple: When did the write start, and when did it finally end, for a single block? The difference is the writeBlockOp t...
   Author: Harsh J, 2013-05-02, 11:21
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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