Volume on BigData being the constant challenge, as an administrator, you will have to keep a tab on the data growth, at the same time you need to make sure there is spurge growth of unwanted objects or folders. Typically you would want to be worried about the (more...)
Recently I have spending most of my time on Big Data projects,using CDH 4.X. Understanding key component of hadoop infrastruture is very necessary, But the MapReduce (MR) is the most important for processing and aggregrating data. For getting the best of the performance, one needs to know (more...)
With replication and fault tolerance, an inbuilt feature of Hadoop. I was always curious to know how blocks are replicated. Got this information while reading “Hadoop The Definitive Guide Edition – 3 ” in chapter 3 “The Hadoop Distributed Filesystem”. Thought would be interesting to share.
Out of the box hadoop provides a benchmarking mechanism for your cluster. While doing the same on Cloudera cluster, it was a fun ride, hence thought will share the same to reduce the pain and increase the fun.
Before you begin anything, set the HADOOP_HOME.The below command (more...)
While while running a simple
beeline > select count(*) from samvi_test_table;
Got the following error.
Job Submission failed with exception 'org.apache.hadoop.security.AccessControlException(Permission denied: user=root, access=WRITE, inode="/user":hdfs:supergroup:drwxr-xr-x
at org.apache.hadoop.hdfs.server.namenode.FSPermissionChecker.check(FSPermissionChecker. (more...)
Recently while upgrading our Exalytics box from PS1 to PS3 for OBIEE 126.96.36.199 patch-set, one of the requirement was to upgrade firmware and to complete the firmware we needed ILOM address. During the upgrade team found out the default ILOM IP was not working and (more...)
Lately I have been spending lot of time on Big Data, its application, architecture and processes. As part of the process, my thoughts on Big Data in print Media. I hope you would enjoy reading.
Hope this helps.
Sunil S Ranka
“Superior BI is the (more...)
Last few months have been a crazy ride, wrapping up on new opportunities and getting upto speed on Hadoop took all the free time away . During my read on Hadoop , I always wondered why we dont have out of the box ODBC driver? I tried using out (more...)
Companies are getting lot lesser value than the amount of dollars they are spending on BI vendors. Following article oulines some of the processes and way to get the maximum out of a vendor.
Hope this helps
Sunil S Ranka
“Superior BI is the antidote to (more...)
It just seems like yesterday, but its again time of the year where we need to recap what took place last year. 2012 was a year of “World coming to an End“, Thank to God, IT directors didn’t think the same and didnot spent all the dollars. 2012 Year started on high note with 11G picking up its momentum. But at point client took their own time to decide on upgrades. With bitten badly of older releases of OBIEE , the foul taste still didn’t leave customers too happy. 188.8.131.52 was a solid answer to many (more...)