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Re: One datanode is down then write/read starts failing - Hadoop - [mail # user]
...The reason being that when you write something in HDFS, it guarantees thatit will be written to the specified number of replicas. So if yourreplication factor is 2 and one of your node (out ...
   Author: Shahab Yunus, 2014-07-28, 17:07
Re: Difference between different tar - Hadoop - [mail # user]
...The '-bin' file does not have the source code (bin for binaries) while theother does. You can check and see the major difference in the 'src' foldersunder the top-level directory after unzip...
   Author: Shahab Yunus, 2014-07-21, 13:00
Re: Data cleansing in modern data architecture - Hadoop - [mail # user]
...I am assuming you meant the batch jobs that are/were used in old world fordata cleansing.As far as I understand there is no hard and fast rule for it and it dependsfunctional and system requ...
   Author: Shahab Yunus, 2014-07-20, 21:20
Re: Merging small files - Hadoop - [mail # user]
...Why it isn't appropriate to discuss too much vendor specific topics on avendor-neutral apache mailing list? Checkout this thread:http://mail-archives.apache.org/mod_mbox/hadoop-mapreduce-use...
   Author: Shahab Yunus, 2014-07-20, 16:32
Re: what exactly does data in HDFS look like? - Hadoop - [mail # user]
...The data itself is eventually store in a form of file. Each blocks of thefile and it replicas are stored in files and directories on differentnodes. The Namenode that keep the information an...
   Author: Shahab Yunus, 2014-07-19, 05:03
Re: Providing a file instead of a directory to a M/R job - Hadoop - [mail # user]
...That is what I thought so too but when I give the parent directory as theinput path of that same file, it works. Perhaps I am messing something up.I am suing cloudera 4.6 btw.Meanwhile I hav...
   Author: Shahab Yunus, 2014-07-17, 15:27
Re: How to recover reducer task data on a different data node? - Hadoop - [mail # user]
...Adding to what Jungi Jeong said, if you can get your hands on the book*Hadoop: The Definitive Guide *by Tom White, then that would help as well asit is explains this in significant detail.Re...
   Author: Shahab Yunus, 2014-07-03, 11:40
Re: The future of MapReduce - Hadoop - [mail # user]
...My personal thoughts on this.I approach this problem in a different way. Map/Reduce is not a frameworkor a technology. It was a paradigm for distributed and parallel processingwhich can be i...
   Author: Shahab Yunus, 2014-07-02, 20:12
Re: Spark vs. Storm - Hadoop - [mail # user]
...Not exactly. There are of course  major implementation differences and thensome subtle and high level ones too.My 2-cents:Spark is in-memory M/R and it simulated streaming or real-time ...
   Author: Shahab Yunus, 2014-07-02, 19:59
Re: job.setOutputFormatClass(NullOutputFormat.class); - Hadoop - [mail # user]
...To get rid of empty *part files while using MultipleOutputs in the new API,LazyOutputFormat class' static method should be used to set the outputformat.Details are here at the official Java ...
   Author: Shahab Yunus, 2014-07-02, 02:19
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