I dont think so. However, its a single line java command. You can create customUDF for this and use in your code.
java.util.UUID.randomUUID(); ~Rajesh.B On Sun, May 20, 2012 at 8:15 AM, DIPESH KUMAR SINGH <[email protected]>wrote: > Thanks Rajesh. > > Is GUID a built in UDF? > > > -- > Dipesh > > On Sun, May 20, 2012 at 8:06 AM, Rajesh Balamohan < > [email protected]> wrote: > > > If you do not bother about sequence number and the intention is to create > > just unique key, you can just use GUID which doesn't require any > > synchronization at all (all mappers can run in parallel). > > > > The approached I suggested in earlier mail comes into picture mainly for > > sequence number. > > > > ~Rajesh.B > > > > On Sun, May 20, 2012 at 8:02 AM, Rajesh Balamohan < > > [email protected]> wrote: > > > > > Pig doesn't have that facility yet. Moreover, its not very efficient to > > do > > > this in PIG/MR as it requires synchronization. > > > > > > However, if this is unavoidable situation for you, following things can > > be > > > considered > > > > > > 1. Maintaining the seq number details in zookeeper > > > 2. Having a simple structure in HBase table (seqNumber --> Value). You > > can > > > get a bucket of values (ex: 1000-2000) from this and use it in your > UDF. > > > When the range depletes, you have to query/update HBase table (ex: > > > 3000-4000). There are corner cases which needs to be handled. > > > > > > > > > ~Rajesh.B > > > > > > > > > On Sat, May 19, 2012 at 12:04 AM, DIPESH KUMAR SINGH < > > > [email protected]> wrote: > > > > > >> Sorry, if my point was not clear. > > >> > > >> I wish to create a sequence on a pig relation. > > >> > > >> Say For example i have a relation with data: > > >> (John, A-1) > > >> (Jack, B-2) > > >> (Jim, C-1) > > >> > > >> I want to create sequence i.e to add one more column to the relation, > > like > > >> a counter and keep on increasing the count for each record read. > > Expected > > >> output should be something like this: > > >> > > >> (If 200 is the start sequence. ) > > >> (John, A-1, 201) > > >> (Jack, B-2, 202) > > >> (Jim, C-1, 203) > > >> > > >> Could you please suggest to proceed on this? > > >> > > >> Thanks, > > >> Dipesh > > >> > > >> On Fri, May 18, 2012 at 6:50 AM, Thejas Nair <[email protected]> > > >> wrote: > > >> > > >> > What do you mean by 'rdbms like sequence' ? > > >> > Thanks, > > >> > Thejas > > >> > > > >> > > > >> > On 5/16/12 10:41 AM, DIPESH KUMAR SINGH wrote: > > >> > > > >> >> I want to create a rdbms like sequence on a Pig relation. > > >> >> > > >> >> Is there any existing UDF which could do this? > > >> >> > > >> >> I am bit new to pig, Kindly suggest how to proceed? > > >> >> > > >> >> > > >> >> Thanks& Regards, > > >> >> > > >> > > > >> > > > >> > > >> > > >> -- > > >> Dipesh Kr. Singh > > >> > > > > > > > > > > > > -- > > > ~Rajesh.B > > > > > > > > > > > -- > > ~Rajesh.B > > > > > > -- > Dipesh Kr. Singh > -- ~Rajesh.B
