I think you can use job.getInt("mapred.task.partition",-1) to get the
mapper ID, which should be the same for the mapper across task reruns.-----Original Message----- From: Piotr Praczyk [mailto:piotr.prac...@gmail.com] Sent: 18 June 2009 15:19 To: core-user@hadoop.apache.org Subject: Re: Getting Task ID inside a Mapper Hi Why don't you provide a seed of random generator generated outside the task ? Then when the task fails, you can provide the same value stored somewhere outside. You could use the task configuration to do so. I don't know anything about obtaining the task ID from within. regards Piotr 2009/6/18 Mark Desnoyer <mdesno...@gmail.com> > Hi, > > I was wondering if it's possible to get a hold of the task id inside a > mapper? I cant' seem to find a way by trolling through the API reference. > I'm trying to implement a Map Reduce version of Latent Dirichlet Allocation > and I need to be able to initialize a random number generator in a task > specific way so that if the task fails and is rerun elsewhere, the results > are the same. Thanks in advance. > > Cheers, > Mark Desnoyer > This message should be regarded as confidential. If you have received this email in error please notify the sender and destroy it immediately. Statements of intent shall only become binding when confirmed in hard copy by an authorised signatory. The contents of this email may relate to dealings with other companies within the Detica Group plc group of companies. Detica Limited is registered in England under No: 1337451. Registered offices: Surrey Research Park, Guildford, Surrey, GU2 7YP, England.
