Get Current Block or Split ID, and using it, the Block Path

Hi, Is it possible to get the 'id' of the currently executing split or block from within the mapper? Using this block Id / split id, I want to be able to query the namenode to get the names of hosts having that block / spllit, and the actual path to the data. I need this for some analytics that

Re: Get Current Block or Split ID, and using it, the Block Path

I think if you called getInputFormat on JobConf and then called getSplits you would atleast get the locations. http://hadoop.apache.org/common/docs/current/api/org/apache/hadoop/mapred/InputSplit.html On Sun, Apr 8, 2012 at 9:16 AM, Deepak Nettem deepaknet...@gmail.comwrote: Hi, Is it

Re: Creating and working with temporary file in a map() function

Thanks for your advise, File.createTempFile() works great, at least in pseudo-ditributed mode, hope cluster solution will do the same work. You saved me hours of trying... On 04/07/2012 11:29 PM, Harsh J wrote: MapReduce sets mapred.child.tmp for all tasks to be the Task Attempt's

Job, JobConf, and Configuration.

Hi guys. Just a theoretical question here : I notice in chapter 1 of the Hadoop orielly book that the new API example has *no* Configuration object. Why is that? I thought the new API still uses / needs a Configuration class when running jobs. Jay Vyas MMSB UCHC On Apr 7, 2012, at 4:29

Re: Get Current Block or Split ID, and using it, the Block Path

Deepak On Sun, Apr 8, 2012 at 9:46 PM, Deepak Nettem deepaknet...@gmail.com wrote: Hi, Is it possible to get the 'id' of the currently executing split or block from within the mapper? Using this block Id / split id, I want to be able to query the namenode to get the names of hosts having

Re: Job, JobConf, and Configuration.

The Job class encapsulates the Configuration object and manages it for you. You can also get its reference out via Job.getConfiguration() - http://hadoop.apache.org/common/docs/current/api/org/apache/hadoop/mapreduce/JobContext.html#getConfiguration() Hence, when you do a: Job job = new Job();,

Re: Creating and working with temporary file in a map() function

It will work. Pseudo-distributed mode shouldn't be all that different from a fully distributed mode. Do let us know if it does not work as intended. On Sun, Apr 8, 2012 at 11:40 PM, Ondřej Klimpera klimp...@fit.cvut.cz wrote: Thanks for your advise, File.createTempFile() works great, at least in

Re: Creating and working with temporary file in a map() function

I will, but deploying application on a cluster is now far away. Just finishing raw implementation. Cluster tuning is planed in the end of this month. Thanks. On 04/08/2012 09:06 PM, Harsh J wrote: It will work. Pseudo-distributed mode shouldn't be all that different from a fully distributed

Re: Get Current Block or Split ID, and using it, the Block Path

I have a related question about blocks related to thisNormally, a reduce job outputs several files, all in the same directory. But why? Since we know that Hadoop is abstracting our file for us, shouldn't the part-r- outputs ultimately be thought of as a single file? What is the

Re: Get Current Block or Split ID, and using it, the Block Path

Hi, The part in the default filename stands for partition. In some cases I agree you would not mind viewing them as a singular file instead of having to read directories - but there are also use cases where you would want each partition file to be unique cause you partitioned and processed them

How do I include the newer version of Commons-lang in my jar?

Hi. I am new to Hadoop and I am working on project on AWS Elastic MapReduce. The problem I am facing is: * org.apache.commons.lang.time.DateUtils: parseDate() works OK but parseDateStrictly() fails. I think parseDateStrictly might be new in lang 2.5. I thought I included all dependencies.