Jignesh, Will your point 2 still be valid if we hire very experienced Java programmers?
Kobina. On 20 September 2011 21:07, Jignesh Patel <jign...@websoft.com> wrote: > > @Kobina > 1. Lack of skill set > 2. Longer learning curve > 3. Single point of failure > > > @Uma > I am curious to know about .20.2 is that stable? Is it same as the one you > mention in your email(Federation changes), If I need scaled nameNode and > append support, which version I should choose. > > Regarding Single point of failure, I believe Hortonworks(a.k.a Yahoo) is > updating the Hadoop API. When that will be integrated with Hadoop. > > If I need > > > -Jignesh > > On Sep 17, 2011, at 12:08 AM, Uma Maheswara Rao G 72686 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. > >>>> > >>> > >> > >
