Hi Uma, Response very much appreciated.
Thanks. Isaac. On 17 September 2011 05:08, Uma Maheswara Rao G 72686 <mahesw...@huawei.com>wrote: > Hi Kobina, > > Some experiences which may helpful for you with respective to DFS. > > 1. Selecting the correct version. > I will recommend to use 0.20X version. This is pretty stable version and > all other organizations prefers it. Well tested as well. > Dont go for 21 version.This version is not a stable version.This is risk. > > 2. You should perform thorough test with your customer operations. > (of-course you will do this :-)) > > 3. 0.20x version has the problem of SPOF. > If NameNode goes down you will loose the data.One way of recovering is by > using the secondaryNameNode.You can recover the data till last > checkpoint.But here manual intervention is required. > In latest trunk SPOF will be addressed bu HDFS-1623. > > 4. 0.20x NameNodes can not scale. Federation changes included in latest > versions. ( i think in 22). this may not be the problem for your cluster. > But please consider this aspect as well. > > 5. Please select the hadoop version depending on your security > requirements. There are versions available for security as well in 0.20X. > > 6. If you plan to use Hbase, it requires append support. 20Append has the > support for append. 0.20.205 release also will have append support but not > yet released. Choose your correct version to avoid sudden surprises. > > > > Regards, > Uma > ----- Original Message ----- > From: Kobina Kwarko <kobina.kwa...@gmail.com> > Date: Saturday, September 17, 2011 3:42 am > Subject: Re: risks of using Hadoop > To: common-user@hadoop.apache.org > > > We are planning to use Hadoop in my organisation for quality of > > servicesanalysis out of CDR records from mobile operators. We are > > thinking of having > > a small cluster of may be 10 - 15 nodes and I'm preparing the > > proposal. my > > office requires that i provide some risk analysis in the proposal. > > > > thank you. > > > > On 16 September 2011 20:34, Uma Maheswara Rao G 72686 > > <mahesw...@huawei.com>wrote: > > > > > Hello, > > > > > > First of all where you are planning to use Hadoop? > > > > > > Regards, > > > Uma > > > ----- Original Message ----- > > > From: Kobina Kwarko <kobina.kwa...@gmail.com> > > > Date: Saturday, September 17, 2011 0:41 am > > > Subject: risks of using Hadoop > > > To: common-user <common-user@hadoop.apache.org> > > > > > > > Hello, > > > > > > > > Please can someone point some of the risks we may incur if we > > > > decide to > > > > implement Hadoop? > > > > > > > > BR, > > > > > > > > Isaac. > > > > > > > > > >
