JM, I personally would chose to put it neither hadoop libs nor hbase libs. Have them go to your application's own install directory.
Then you could sent the variable HADOOP_CLASSPATH to have your jar (also include hbase jars, hbase dependencies and dependencies your program needs) And to execute fire 'hadoop jar' command. An example[1]: Set classpath: export HADOOP_CLASSPATH=`hbase classpath`:mycool.jar:mycooldependency.jar Fire following to launch your job: hadoop jar mycool.jar hbase.experiments.MyCoolProgram -Dmapred.running.map.limit=50 -Dmapred.map.tasks.speculative.execution=false aCommandLineArg Did I get your question right? [1] In the example I gave `hbase classpath` gets you set with all hbase jars. On Fri, Nov 2, 2012 at 11:56 AM, Jean-Marc Spaggiari < [email protected]> wrote: > Hi Shrijeet, > > Helped a lot! Thanks! > > Now, the only think I need is to know where's the best place to put my > JAR on the server. Should I put it on the hadoop lib directory? Or > somewhere on the HBase structure? > > Thanks, > > JM > > 2012/10/29, Shrijeet Paliwal <[email protected]>: > > In line. > > > > On Mon, Oct 29, 2012 at 8:11 AM, Jean-Marc Spaggiari < > > [email protected]> wrote: > > > >> I'm replying to myself ;) > >> > >> I found "cleanup" and "setup" methods from the TableMapper table. So I > >> think those are the methods I was looking for. I will init the > >> HTablePool there. Please let me know if I'm wrong. > >> > >> Now, I still have few other questions. > >> > >> 1) context.getCurrentValue() can throw a InterrruptedException, but > >> when can this occur? Is there a timeout on the Mapper side? Of it's if > >> the region is going down while the job is running? > >> > > > > You do not need to call context.getCurrentValue(). The 'value' argument > to > > map method[1] has the information you are looking for. > > > > > >> 2) How can I pass parameters to the Map method? Can I use > >> job.getConfiguration().put to add some properties there, can get them > >> back in context.getConfiguration.get? > >> > > > > Yes, thats how it is done. > > > > > >> 3) What's the best way to log results/exceptions/traces from the map > >> method? > >> > > > > In most cases, you'll have mapper and reducer classes as nested static > > classes within some enclosing class. You can get handle to the Logger > from > > the enclosing class and do your usual LOG.info, LOG.warn yada yada. > > > > Hope it helps. > > > > [1] map(KEYIN key, *VALUEIN value*, Context context) > > > >> > >> I will search on my side, but some help will be welcome because it > >> seems there is not much documentation when we start to dig a bit :( > >> > >> JM > >> > >> 2012/10/27, Jean-Marc Spaggiari <[email protected]>: > >> > Hi, > >> > > >> > I'm thinking about my firs MapReduce class and I have some questions. > >> > > >> > The goal of it will be to move some rows from one table to another one > >> > based on the timestamp only. > >> > > >> > Since this is pretty new for me, I'm starting from the RowCounter > >> > class to have a baseline. > >> > > >> > There are few things I will have to update. First, the > >> > createSumittableJob method to get timestamp range instead of key > >> > range, and "play2 with the parameters. This part is fine. > >> > > >> > Next, I need to update the map method, and this is where I have some > >> > questions. > >> > > >> > I'm able to find the timestamp of all the cf:c from the > >> > context.getCurrentValue() method, that's fine. Now, my concern is on > >> > the way to get access to the table to store this field, and the table > >> > to delete it. Should I instantiate an HTable for the source table, and > >> > execute and delete on it, then do an insert on another HTable > >> > instance? Should I use an HTablePool? Also, since I’m already on the > >> > row, can’t I just mark it as deleted instead of calling a new HTable? > >> > > >> > Also, instead of calling the delete and put one by one, I would like > >> > to put them on a list and execute it only when it’s over 10 members. > >> > How can I make sure that at the end of the job, this is flushed? Else, > >> > I will lose some operations. Is there a kind of “dispose” method > >> > called on the region when the job is done? > >> > > >> > Thanks, > >> > > >> > JM > >> > > >> > > >
