Hi Joey, Can you give more explanation about that? You mean I should make a new user and new group or just ssh?
Thanks. On Mon, Dec 26, 2011 at 3:57 AM, Joey Echeverria <j...@cloudera.com> wrote: > Don't start your daemons as root. They should be started as a system > account. Typically hdfs for the HDFS services and mapred for the > MapReduce ones. > > -Joey > > On Fri, Dec 23, 2011 at 4:04 AM, Martinus Martinus > <martinus...@gmail.com> wrote: > > Hi Ayon, > > > > I tried to setup the hadoop-cluster using hadoop-0.20.2 and it seem's to > be > > ok, but when I tried to used another version of hadoop, such as > > hadoop-0.20.3, when I start-all.sh, it gaves me an error like this : > > > > uvm12dk: Unrecognized option: -jvm > > uvm12dk: Could not create the Java virtual machine. > > > > Would you be so kindly to help me with this problem? > > > > Thanks. > > > > Martinus > > > > > > On Wed, Dec 21, 2011 at 1:12 PM, Ayon Sinha <ayonsi...@yahoo.com> wrote: > >> > >> Couple of things: > >> 1. Hadoop's strength is in data locality. So having most of your Hadoop > >> heavy lifting on local filesystem (HDFS where hadoop computation is > shipped > >> to the nodes with the data). > >> 2. Assuming you are pulling data into Hadoop from Mongo to crunch and > put > >> the resulting data back into Mongo as only the 1st and the last step in > your > >> entire workflow, you are basically looking for a MongoInputFormat and > >> MongoOutputFormat (I made up the class names). you are probably looking > for > >> https://jira.mongodb.org/browse/HADOOP/component/10736 > >> > >> Your other options if using Pig or Hive is to write Loader UDF's, > similar > >> to PigStorage, HBaseStorage, etc. > >> > >> -Ayon > >> See My Photos on Flickr > >> Also check out my Blog for answers to commonly asked questions. > >> > >> ________________________________ > >> From: Martinus Martinus <martinus...@gmail.com> > >> To: hdfs-user@hadoop.apache.org > >> Sent: Tuesday, December 20, 2011 7:31 PM > >> Subject: hadoop cluster for querying data on mongodb > >> > >> Hi, > >> > >> I have hadoop cluster running and have my data inside mongodb database. > I > >> already write a java code to query data on mongodb using mongodb-java > >> driver. And right now, I want to use hadoop cluster to run my java code > to > >> get and put the data from and to mongo database. Did anyone has done > this > >> before? Can you explain to me how to do that? > >> > >> Thanks. > >> > >> > > > > > > -- > Joseph Echeverria > Cloudera, Inc. > 443.305.9434 >
