You can only do the last_update idea if this is an insert only dataset. If your table takes updates you need a different strategy. 1) full dumps every interval. 2) Using a storage handler like hbase or cassandra that takes update operations
On Mon, Dec 24, 2012 at 9:22 AM, Jeremiah Peschka < jeremiah.pesc...@gmail.com> wrote: > If it were me, I would find a way to identify the partitions that have > modified data and then re-load a subset of the partitions (only the ones > with changes) on a regular basis. Instead of updating/deleting data, you'll > be re-loading specific partitions as an all or nothing action. > > On Monday, December 24, 2012, Ibrahim Yakti wrote: > >> This already done, but Hive does not support update nor deletion of data, >> so when I import the data after specific "last_update_time" records, hive >> will append it not replace. >> >> >> -- >> Ibrahim >> >> >> On Mon, Dec 24, 2012 at 5:03 PM, Mohammad Tariq <donta...@gmail.com>wrote: >> >> You can use Apache Oozie to schedule your imports. >> >> Alternatively, you can have an additional column in your SQL table, say >> LastUpdatedTime or something. As soon as there is a change in this column >> you can start the import from this point. This way you don't have to import >> all the things everytime there is a change in your table. You just have to >> move only the most recent data, say only the 'delta' amount of data. >> >> Best Regards, >> Tariq >> +91-9741563634 >> https://mtariq.jux.com/ >> >> >> On Mon, Dec 24, 2012 at 7:08 PM, Ibrahim Yakti <iya...@souq.com> wrote: >> >> My question was how to reflect MySQL updates to hadoop/hive, this is our >> problem now. >> >> >> -- >> Ibrahim >> >> >> On Mon, Dec 24, 2012 at 4:35 PM, Mohammad Tariq <donta...@gmail.com>wrote: >> >> Cool. Then go ahead :) >> >> Just in case you need something in realtime, you can have a look at >> Impala.(I know nobody likes to get preached, but just in case ;) ). >> >> Best Regards, >> Tariq >> +91-9741563634 >> https://mtariq.jux.com/ >> >> >> On Mon, Dec 24, 2012 at 7:00 PM, Ibrahim Yakti <iya...@souq.com> wrote: >> >> Thanks Mohammad, No, we do not have any plans to replace our RDBMS with >> Hive. Hadoop/Hive will be used as Data Warehouse & batch processing >> computing, as I said we want to use Hive for analytical queries. >> >> >> -- >> Ibrahim >> >> >> On Mon, Dec 24, 2012 at 4:19 PM, Mohammad Tariq <donta...@gmail.com>wrote: >> >> Hello Ibrahim, >> >> A quick questio. Are you planning to replace your SQL DB with Hive? >> If that is the case, I would not suggest to do that. Both are meant for >> entirely different purposes. Hive is for batch processing and not for real >> time system. So if you are requirements involve real time things, you need >> to think before moving ahead. >> >> Yes, Sqoop is 'the' tool. It is primarily meant for this purpose. >> >> HTH >> >> Best Regards, >> Tariq >> +91-9741563634 >> https://mtariq.jux.com/ >> >> >> On Mon, Dec 24, 2012 at 6:38 PM, Ibrahim Yakti <iya...@souq.com> wrote: >> >> Hi All, >> >> We are new to hadoop and hive, we are trying to use hive to >> run analytical queries and we are using sqoop to import data into hive, in >> our RDBMS the data updated very frequently and this needs to be reflected >> to hive. Hive does not support update/delete but there are many workarounds >> to do this task. >> >> What's in our mind is importing all the >> >> > > -- > --- > Jeremiah Peschka > Founder, Brent Ozar Unlimited > Microsoft SQL Server MVP > >
