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RE: How to configure multiple reduce jobs in hadoop 2.2.0 - MapReduce - [mail # user]
...I read this blog, and have the following questions: What is the relationship between "mapreduce.map.memory.mb" and "mapreduce.map.java.opts"? In the blog, it gives the following settings as ...
   Author: java8964, 2014-01-17, 15:39
RE: Reading multiple input files. - MapReduce - [mail # user]
...Yes.  The hadoop is very flexible for underline storage system. It is in your control,  how to utilize the cluster's resource, include CPU, memory, IO and network bandwidth. Check ...
   Author: java8964, 2014-01-10, 16:04
RE: Running Hadoop v2 clustered mode MR on an NFS mounted filesystem - MapReduce - [mail # user]
...When you said that the mappers seem to be accessing file sequentially, why do you think so? NFS maybe changes something, but mappers shouldn't access file sequentially. NFS could make the fi...
   Author: java8964, 2014-01-10, 15:42
RE: how to caculate a HDFS directory size ? - MapReduce - [mail # user]
...Or even easier like this: hadoop fs -dus /path      ...
   Author: java8964, 2014-01-09, 16:57
RE: Setting up Snappy compression in Hadoop - MapReduce - [mail # user]
...If you really confirmed that libsnappy.so.1 is in the correct location, and being loaded into java library path, working in your test program, but still didn't work in MR, there is one anoth...
   Author: java8964, 2014-01-02, 16:02
RE: any suggestions on IIS log storage and analysis? - MapReduce - [mail # user]
...Google "Hadoop WholeFileInputFormat" or search it in book "Hadoop: The Definitive Guide" Yong   Date: Tue, 31 Dec 2013 09:39:58 +0800 Subject: Re: any suggestions on IIS log storage and...
   Author: java8964, 2013-12-31, 02:17
RE: Unable to access the link - MapReduce - [mail # user]
...What's wrong to download it from the Apache official website? http://archive.apache.org/dist/hadoop/core/hadoop-1.1.2/ Yong  Date: Mon, 30 Dec 2013 11:42:25 -0500 Subject: Unable to acc...
   Author: java8964, 2013-12-30, 16:49
RE: Any method to get input splits by column? - MapReduce - [mail # user]
...You need to store your data into "column-based" format, checking out Hive RCFile, and its InputFormat option. Yong  Date: Mon, 23 Dec 2013 21:37:23 +0800 Subject: Any method to get inpu...
   Author: java8964, 2013-12-23, 16:48
RE: File size 0 bytes while open for write - MapReduce - [mail # user]
...The HDFS client that opens a file for writing is granted a lease for the file; no other client can write to the file. The writing client periodically renews the lease by sending a heartbeat ...
   Author: java8964, 2013-12-13, 14:31
RE: issue about Shuffled Maps in MR job summary - MapReduce - [mail # user]
...Or you should check  your job history UI, which provide the similar information as job tracker, as you are using MR2 and Yarn. The default port of job history UI is 19888.  From: [...
   Author: java8964, 2013-12-12, 15:16
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