Hi Ajit, Once you're comfortable with HDFS+MapReduce from Harsh's links, you may want to specifically check out HBase, the Hadoop NoSQL Database.
-- Sameer Farooqui Systems Architect / Hortonworks On Sat, Feb 18, 2012 at 2:26 AM, Harsh J <ha...@cloudera.com> wrote: > Hi, > > HDFS isn't a "replacement" for Databases, it is a File-System (Hadoop > Distributed File System - HDFS). > > I suggest reading up on what Hadoop is first. Both the book "Hadoop: The > Definitive Guide" by Tom White (O'Reilly) and the mildly dated, > developer-focussed article at http://developer.yahoo.com/hadoop/tutorial/are > great resources at understanding and getting started with Apache > Hadoop, and understanding how it can help in your work. > > On Sat, Feb 18, 2012 at 11:35 AM, Ajit Deshpande <ajit.deshpa...@usain.com > > wrote: > >> Hi Steve,**** >> >> I m in process of learning HADOOP.**** >> >> I have installed HDFS on SUSE-10.**** >> >> But I m confused what to do next. I searched over Google but not able to >> find much about it .**** >> >> So can anyone suggest what I need to do if I have to implement HDFS for >> different databases?**** >> >> ** ** >> >> ** ** >> >> * >> Ajit Deshpande >> United Software Associates Pvt. Ltd. >> Pune, India >> www.usain.com***** >> >> ** ** >> >> *From:* Stuti Awasthi [mailto:stutiawas...@hcl.com] >> *Sent:* Friday, February 17, 2012 10:22 AM >> *To:* hdfs-user@hadoop.apache.org; Steve Lewis >> *Subject:* RE: facing issues in HDFSProxy**** >> >> ** ** >> >> After I commented line “ >> sslConf.set("proxy.http.test.listener.addr",conf.get("proxy.http.test.listener.addr"));” >> in HDFSProxy.java getting below error :**** >> >> ** ** >> >> 2012-02-16 14:59:25,156 WARN org.mortbay.log: >> java.lang.NullPointerException**** >> >> 2012-02-16 14:59:25,156 INFO org.apache.hadoop.http.HttpServer: >> HttpServer.start() threw a non Bind IOException**** >> >> 2012-02-16 14:59:25,162 ERROR org.apache.hadoop.hdfsproxy.HdfsProxy: >> java.io.IOException: !JsseListener: java.lang.NullPointerException**** >> >> at >> org.mortbay.jetty.security.SslSocketConnector.newServerSocket(SslSocketConnector.java:516) >> **** >> >> at >> org.mortbay.jetty.bio.SocketConnector.open(SocketConnector.java:73)**** >> >> at org.apache.hadoop.http.HttpServer.start(HttpServer.java:581)*** >> * >> >> at org.apache.hadoop.hdfsproxy.HdfsProxy.start(HdfsProxy.java:84)* >> *** >> >> at >> org.apache.hadoop.hdfsproxy.HdfsProxy.createHdfsProxy(HdfsProxy.java:135) >> **** >> >> at org.apache.hadoop.hdfsproxy.HdfsProxy.main(HdfsProxy.java:141)* >> *** >> >> ** ** >> >> Any ideas how to fix it ?**** >> >> ** ** >> >> ** ** >> >> *From:* Denny Ye [mailto:denny...@gmail.com] >> *Sent:* Friday, February 17, 2012 7:40 AM >> *To:* hdfs-user@hadoop.apache.org; Steve Lewis >> *Subject:* Re: facing issues in HDFSProxy**** >> >> ** ** >> >> Sure, it's the temporary code, you can delete that line.**** >> >> ** ** >> >> -Regards**** >> >> Denny Ye**** >> >> 2012/2/16 Stuti Awasthi <stutiawas...@hcl.com>**** >> >> Thanks Denny,**** >> >> **** >> >> Commenting below line in HDFSProxy.java class and rebuilding it . Will >> this help ?**** >> >> >> sslConf.set("proxy.http.test.listener.addr",conf.get("proxy.http.test.listener.addr")); >> **** >> >> **** >> >> Thanks**** >> >> **** >> >> *From:* Denny Ye [mailto:denny...@gmail.com] >> *Sent:* Thursday, February 16, 2012 2:27 PM >> *To:* hdfs-user@hadoop.apache.org >> *Subject:* Re: facing issues in HDFSProxy**** >> >> **** >> >> In my local Hadoop version, I saw the temporary code with inexistent >> property name.**** >> >> Hashtable does not accept 'null' as the normal value. **** >> >> It's the mistake of unit testing**** >> >> **** >> >> -Regards**** >> >> Denny Ye**** >> >> 2012/2/16 Stuti Awasthi <stutiawas...@hcl.com>**** >> >> Hi all,**** >> >> Any pointers for this ?**** >> >> **** >> >> *From:* Stuti Awasthi >> *Sent:* Wednesday, February 15, 2012 5:53 PM >> *To:* hdfs-user@hadoop.apache.org >> *Subject:* facing issues in HDFSProxy**** >> >> **** >> >> Hi,**** >> >> I am using Hadoop 1.0.0 and want to try HDFSProxy . Following:**** >> >> >> http://hadoop.apache.org/hdfs/docs/r0.21.0/hdfsproxy.html#Jetty-based+Installation+and+Configuration >> **** >> >> **** >> >> When I run start-hdfsproxy.sh script I get following error in logs :**** >> >> ************************************************************/**** >> >> 2012-02-15 17:32:02,676 INFO org.apache.hadoop.hdfsproxy.HdfsProxy: HDFS >> NameNode is at: namenode:54310**** >> >> 2012-02-15 17:32:02,677 ERROR org.apache.hadoop.hdfsproxy.HdfsProxy: >> java.lang.NullPointerException**** >> >> at java.util.Hashtable.put(Hashtable.java:411)**** >> >> at java.util.Properties.setProperty(Properties.java:160)**** >> >> at org.apache.hadoop.conf.Configuration.set(Configuration.java:437) >> **** >> >> at >> org.apache.hadoop.hdfsproxy.HdfsProxy.initialize(HdfsProxy.java:63)**** >> >> at org.apache.hadoop.hdfsproxy.HdfsProxy.<init>(HdfsProxy.java:44) >> **** >> >> at >> org.apache.hadoop.hdfsproxy.HdfsProxy.createHdfsProxy(HdfsProxy.java:135) >> **** >> >> at org.apache.hadoop.hdfsproxy.HdfsProxy.main(HdfsProxy.java:142)**** >> >> **** >> >> After googling around I got this Jira “ >> https://issues.apache.org/jira/browse/HADOOP-5432”**** >> >> Should I apply this patch to fix the issue ?**** >> >> **** >> >> Please suggest**** >> >> **** >> >> Regards,**** >> >> *Stuti Awasthi***** >> >> HCL Comnet Systems and Services Ltd**** >> >> F-8/9 Basement, Sec-3,Noida.**** >> >> **** >> >> **** >> ------------------------------ >> >> ::DISCLAIMER:: >> >> ----------------------------------------------------------------------------------------------------------------------- >> >> The contents of this e-mail and any attachment(s) are confidential and >> intended for the named recipient(s) only. >> It shall not attach any liability on the originator or HCL or its >> affiliates. Any views or opinions presented in >> this email are solely those of the author and may not necessarily reflect >> the opinions of HCL or its affiliates. >> Any form of reproduction, dissemination, copying, disclosure, >> modification, distribution and / or publication of >> this message without the prior written consent of the author of this >> e-mail is strictly prohibited. If you have >> received this email in error please delete it and notify the sender >> immediately. Before opening any mail and >> attachments please check them for viruses and defect. >> >> >> ----------------------------------------------------------------------------------------------------------------------- >> **** >> >> **** >> >> ** ** >> > > > > -- > Harsh J > Customer Ops. Engineer > Cloudera | http://tiny.cloudera.com/about >
<<image001.jpg>>
