Hi Chris, I just read the weekly blog progress update. The UPSERT operation is now supported on the server side. Does this mean that there is no need to explicitly state “Append” or “Overwrite” when writing to a table?
Just curious. Cheers, Ben > On May 18, 2016, at 9:01 AM, Chris George <christopher.geo...@rms.com> wrote: > > There is some code in review that needs some more refinement. > It will allow upsert/insert from a dataframe using the datasource api. It > will also allow the creation and deletion of tables from a dataframe > http://gerrit.cloudera.org:8080/#/c/2992/ > <http://gerrit.cloudera.org:8080/#/c/2992/> > > Example usages will look something like: > http://gerrit.cloudera.org:8080/#/c/2992/5/docs/developing.adoc > <http://gerrit.cloudera.org:8080/#/c/2992/5/docs/developing.adoc> > > -Chris George > > > On 5/18/16, 9:45 AM, "Benjamin Kim" <bbuil...@gmail.com > <mailto:bbuil...@gmail.com>> wrote: > > Can someone tell me what the state is of this Spark work? > > Also, does anyone have any sample code on how to update/insert data in Kudu > using DataFrames? > > Thanks, > Ben > > >> On Apr 13, 2016, at 8:22 AM, Chris George <christopher.geo...@rms.com >> <mailto:christopher.geo...@rms.com>> wrote: >> >> SparkSQL cannot support these type of statements but we may be able to >> implement similar functionality through the api. >> -Chris >> >> On 4/12/16, 5:19 PM, "Benjamin Kim" <bbuil...@gmail.com >> <mailto:bbuil...@gmail.com>> wrote: >> >> It would be nice to adhere to the SQL:2003 standard for an “upsert” if it >> were to be implemented. >> >> MERGE INTO table_name USING table_reference ON (condition) >> WHEN MATCHED THEN >> UPDATE SET column1 = value1 [, column2 = value2 ...] >> WHEN NOT MATCHED THEN >> INSERT (column1 [, column2 ...]) VALUES (value1 [, value2 …]) >> >> Cheers, >> Ben >> >>> On Apr 11, 2016, at 12:21 PM, Chris George <christopher.geo...@rms.com >>> <mailto:christopher.geo...@rms.com>> wrote: >>> >>> I have a wip kuduRDD that I made a few months ago. I pushed it into gerrit >>> if you want to take a look. http://gerrit.cloudera.org:8080/#/c/2754/ >>> <http://gerrit.cloudera.org:8080/#/c/2754/> >>> It does pushdown predicates which the existing input formatter based rdd >>> does not. >>> >>> Within the next two weeks I’m planning to implement a datasource for spark >>> that will have pushdown predicates and insertion/update functionality (need >>> to look more at cassandra and the hbase datasource for best way to do this) >>> I agree that server side upsert would be helpful. >>> Having a datasource would give us useful data frames and also make spark >>> sql usable for kudu. >>> >>> My reasoning for having a spark datasource and not using Impala is: 1. We >>> have had trouble getting impala to run fast with high concurrency when >>> compared to spark 2. We interact with datasources which do not integrate >>> with impala. 3. We have custom sql query planners for extended sql >>> functionality. >>> >>> -Chris George >>> >>> >>> On 4/11/16, 12:22 PM, "Jean-Daniel Cryans" <jdcry...@apache.org >>> <mailto:jdcry...@apache.org>> wrote: >>> >>> You guys make a convincing point, although on the upsert side we'll need >>> more support from the servers. Right now all you can do is an INSERT then, >>> if you get a dup key, do an UPDATE. I guess we could at least add an API on >>> the client side that would manage it, but it wouldn't be atomic. >>> >>> J-D >>> >>> On Mon, Apr 11, 2016 at 9:34 AM, Mark Hamstra <m...@clearstorydata.com >>> <mailto:m...@clearstorydata.com>> wrote: >>> It's pretty simple, actually. I need to support versioned datasets in a >>> Spark SQL environment. Instead of a hack on top of a Parquet data store, >>> I'm hoping (among other reasons) to be able to use Kudu's write and >>> timestamp-based read operations to support not only appending data, but >>> also updating existing data, and even some schema migration. The most >>> typical use case is a dataset that is updated periodically (e.g., weekly or >>> monthly) in which the the preliminary data in the previous window (week or >>> month) is updated with values that are expected to remain unchanged from >>> then on, and a new set of preliminary values for the current window need to >>> be added/appended. >>> >>> Using Kudu's Java API and developing additional functionality on top of >>> what Kudu has to offer isn't too much to ask, but the ease of integration >>> with Spark SQL will gate how quickly we would move to using Kudu and how >>> seriously we'd look at alternatives before making that decision. >>> >>> On Mon, Apr 11, 2016 at 8:14 AM, Jean-Daniel Cryans <jdcry...@apache.org >>> <mailto:jdcry...@apache.org>> wrote: >>> Mark, >>> >>> Thanks for taking some time to reply in this thread, glad it caught the >>> attention of other folks! >>> >>> On Sun, Apr 10, 2016 at 12:33 PM, Mark Hamstra <m...@clearstorydata.com >>> <mailto:m...@clearstorydata.com>> wrote: >>> Do they care being able to insert into Kudu with SparkSQL >>> >>> I care about insert into Kudu with Spark SQL. I'm currently delaying a >>> refactoring of some Spark SQL-oriented insert functionality while trying to >>> evaluate what to expect from Kudu. Whether Kudu does a good job supporting >>> inserts with Spark SQL will be a key consideration as to whether we adopt >>> Kudu. >>> >>> I'd like to know more about why SparkSQL inserts in necessary for you. Is >>> it just that you currently do it that way into some database or parquet so >>> with minimal refactoring you'd be able to use Kudu? Would re-writing those >>> SQL lines into Scala and directly use the Java API's KuduSession be too >>> much work? >>> >>> Additionally, what do you expect to gain from using Kudu VS your current >>> solution? If it's not completely clear, I'd love to help you think through >>> it. >>> >>> >>> On Sun, Apr 10, 2016 at 12:23 PM, Jean-Daniel Cryans <jdcry...@apache.org >>> <mailto:jdcry...@apache.org>> wrote: >>> Yup, starting to get a good idea. >>> >>> What are your DS folks looking for in terms of functionality related to >>> Spark? A SparkSQL integration that's as fully featured as Impala's? Do they >>> care being able to insert into Kudu with SparkSQL or just being able to >>> query real fast? Anything more specific to Spark that I'm missing? >>> >>> FWIW the plan is to get to 1.0 in late Summer/early Fall. At Cloudera all >>> our resources are committed to making things happen in time, and a more >>> fully featured Spark integration isn't in our plans during that period. I'm >>> really hoping someone in the community will help with Spark, the same way >>> we got a big contribution for the Flume sink. >>> >>> J-D >>> >>> On Sun, Apr 10, 2016 at 11:29 AM, Benjamin Kim <bbuil...@gmail.com >>> <mailto:bbuil...@gmail.com>> wrote: >>> Yes, we took Kudu for a test run using 0.6 and 0.7 versions. But, since >>> it’s not “production-ready”, upper management doesn’t want to fully deploy >>> it yet. They just want to keep an eye on it though. Kudu was so much >>> simpler and easier to use in every aspect compared to HBase. Impala was >>> great for the report writers and analysts to experiment with for the short >>> time it was up. But, once again, the only blocker was the lack of Spark >>> support for our Data Developers/Scientists. So, production-level data >>> population won’t happen until then. >>> >>> I hope this helps you get an idea where I am coming from… >>> >>> Cheers, >>> Ben >>> >>> >>>> On Apr 10, 2016, at 11:08 AM, Jean-Daniel Cryans <jdcry...@apache.org >>>> <mailto:jdcry...@apache.org>> wrote: >>>> >>>> On Sun, Apr 10, 2016 at 12:30 AM, Benjamin Kim <bbuil...@gmail.com >>>> <mailto:bbuil...@gmail.com>> wrote: >>>> J-D, >>>> >>>> The main thing I hear that Cassandra is being used as an updatable hot >>>> data store to ensure that duplicates are taken care of and idempotency is >>>> maintained. Whether data was directly retrieved from Cassandra for >>>> analytics, reports, or searches, it was not clear as to what was its main >>>> use. Some also just used it for a staging area to populate downstream >>>> tables in parquet format. The last thing I heard was that CQL was >>>> terrible, so that rules out much use of direct queries against it. >>>> >>>> I'm no C* expert, but I don't think CQL is meant for real analytics, just >>>> ease of use instead of plainly using the APIs. Even then, Kudu should beat >>>> it easily on big scans. Same for HBase. We've done benchmarks against the >>>> latter, not the former. >>>> >>>> >>>> As for our company, we have been looking for an updatable data store for a >>>> long time that can be quickly queried directly either using Spark SQL or >>>> Impala or some other SQL engine and still handle TB or PB of data without >>>> performance degradation and many configuration headaches. For now, we are >>>> using HBase to take on this role with Phoenix as a fast way to directly >>>> query the data. I can see Kudu as the best way to fill this gap easily, >>>> especially being the closest thing to other relational databases out there >>>> in familiarity for the many SQL analytics people in our company. The other >>>> alternative would be to go with AWS Redshift for the same reasons, but it >>>> would come at a cost, of course. If we went with either solutions, Kudu or >>>> Redshift, it would get rid of the need to extract from HBase to parquet >>>> tables or export to PostgreSQL to support more of the SQL language using >>>> by analysts or the reporting software we use.. >>>> >>>> Ok, the usual then *smile*. Looks like we're not too far off with Kudu. >>>> Have you folks tried Kudu with Impala yet with those use cases? >>>> >>>> >>>> I hope this helps. >>>> >>>> It does, thanks for nice reply. >>>> >>>> >>>> Cheers, >>>> Ben >>>> >>>>> On Apr 9, 2016, at 2:00 PM, Jean-Daniel Cryans <jdcry...@apache.org >>>>> <mailto:jdcry...@apache.org>> wrote: >>>>> >>>>> Ha first time I'm hearing about SMACK. Inside Cloudera we like to refer >>>>> to "Impala + Kudu" as Kimpala, but yeah it's not as sexy. My colleagues >>>>> who were also there did say that the hype around Spark isn't dying down. >>>>> >>>>> There's definitely an overlap in the use cases that Cassandra, HBase, and >>>>> Kudu cater to. I wouldn't go as far as saying that C* is just an interim >>>>> solution for the use case you describe. >>>>> >>>>> Nothing significant happened in Kudu over the past month, it's a storage >>>>> engine so things move slowly *smile*. I'd love to see more contributions >>>>> on the Spark front. I know there's code out there that could be >>>>> integrated in kudu-spark, it just needs to land in gerrit. I'm sure folks >>>>> will happily review it. >>>>> >>>>> Do you have relevant experiences you can share? I'd love to learn more >>>>> about the use cases for which you envision using Kudu as a C* replacement. >>>>> >>>>> Thanks, >>>>> >>>>> J-D >>>>> >>>>> On Fri, Apr 8, 2016 at 12:45 PM, Benjamin Kim <bbuil...@gmail.com >>>>> <mailto:bbuil...@gmail.com>> wrote: >>>>> Hi J-D, >>>>> >>>>> My colleagues recently came back from Strata in San Jose. They told me >>>>> that everything was about Spark and there is a big buzz about the SMACK >>>>> stack (Spark, Mesos, Akka, Cassandra, Kafka). I still think that >>>>> Cassandra is just an interim solution as a low-latency, easily queried >>>>> data store. I was wondering if anything significant happened in regards >>>>> to Kudu, especially on the Spark front. Plus, can you come up with your >>>>> own proposed stack acronym to promote? >>>>> >>>>> Cheers, >>>>> Ben >>>>> >>>>> >>>>>> On Mar 1, 2016, at 12:20 PM, Jean-Daniel Cryans <jdcry...@apache.org >>>>>> <mailto:jdcry...@apache.org>> wrote: >>>>>> >>>>>> Hi Ben, >>>>>> >>>>>> AFAIK no one in the dev community committed to any timeline. I know of >>>>>> one person on the Kudu Slack who's working on a better RDD, but that's >>>>>> about it. >>>>>> >>>>>> Regards, >>>>>> >>>>>> J-D >>>>>> >>>>>> On Tue, Mar 1, 2016 at 11:00 AM, Benjamin Kim <b...@amobee.com >>>>>> <mailto:b...@amobee.com>> wrote: >>>>>> Hi J-D, >>>>>> >>>>>> Quick question… Is there an ETA for KUDU-1214? I want to target a >>>>>> version of Kudu to begin real testing of Spark against it for our devs. >>>>>> At least, I can tell them what timeframe to anticipate. >>>>>> >>>>>> Just curious, >>>>>> Benjamin Kim >>>>>> Data Solutions Architect >>>>>> >>>>>> [a•mo•bee] (n.) the company defining digital marketing. >>>>>> >>>>>> Mobile: +1 818 635 2900 <tel:%2B1%20818%20635%202900> >>>>>> 3250 Ocean Park Blvd, Suite 200 | Santa Monica, CA 90405 | >>>>>> www.amobee.com <http://www.amobee.com/> >>>>>> >>>>>>> On Feb 24, 2016, at 3:51 PM, Jean-Daniel Cryans <jdcry...@apache.org >>>>>>> <mailto:jdcry...@apache.org>> wrote: >>>>>>> >>>>>>> The DStream stuff isn't there at all. I'm not sure if it's needed >>>>>>> either. >>>>>>> >>>>>>> The kuduRDD is just leveraging the MR input format, ideally we'd use >>>>>>> scans directly. >>>>>>> >>>>>>> The SparkSQL stuff is there but it doesn't do any sort of pushdown. >>>>>>> It's really basic. >>>>>>> >>>>>>> The goal was to provide something for others to contribute to. We have >>>>>>> some basic unit tests that others can easily extend. None of us on the >>>>>>> team are Spark experts, but we'd be really happy to assist one improve >>>>>>> the kudu-spark code. >>>>>>> >>>>>>> J-D >>>>>>> >>>>>>> On Wed, Feb 24, 2016 at 3:41 PM, Benjamin Kim <bbuil...@gmail.com >>>>>>> <mailto:bbuil...@gmail.com>> wrote: >>>>>>> J-D, >>>>>>> >>>>>>> It looks like it fulfills most of the basic requirements (kudu RDD, >>>>>>> kudu DStream) in KUDU-1214. Am I right? Besides shoring up more Spark >>>>>>> SQL functionality (Dataframes) and doing the documentation, what more >>>>>>> needs to be done? Optimizations? >>>>>>> >>>>>>> I believe that it’s a good place to start using Spark with Kudu and >>>>>>> compare it to HBase with Spark (not clean). >>>>>>> >>>>>>> Thanks, >>>>>>> Ben >>>>>>> >>>>>>> >>>>>>>> On Feb 24, 2016, at 3:10 PM, Jean-Daniel Cryans <jdcry...@apache.org >>>>>>>> <mailto:jdcry...@apache.org>> wrote: >>>>>>>> >>>>>>>> AFAIK no one is working on it, but we did manage to get this in for >>>>>>>> 0.7.0: https://issues.cloudera.org/browse/KUDU-1321 >>>>>>>> <https://issues.cloudera.org/browse/KUDU-1321> >>>>>>>> >>>>>>>> It's a really simple wrapper, and yes you can use SparkSQL on Kudu, >>>>>>>> but it will require a lot more work to make it fast/useful. >>>>>>>> >>>>>>>> Hope this helps, >>>>>>>> >>>>>>>> J-D >>>>>>>> >>>>>>>> On Wed, Feb 24, 2016 at 3:08 PM, Benjamin Kim <bbuil...@gmail.com >>>>>>>> <mailto:bbuil...@gmail.com>> wrote: >>>>>>>> I see this KUDU-1214 <https://issues.cloudera.org/browse/KUDU-1214> >>>>>>>> targeted for 0.8.0, but I see no progress on it. When this is >>>>>>>> complete, will this mean that Spark will be able to work with Kudu >>>>>>>> both programmatically and as a client via Spark SQL? Or is there more >>>>>>>> work that needs to be done on the Spark side for it to work? >>>>>>>> >>>>>>>> Just curious. >>>>>>>> >>>>>>>> Cheers, >>>>>>>> Ben >>>>>>>> >>>>>>>> >>>>>>> >>>>>>> >>>>>> >>>>>> >>>>> >>>>> >>>> >>>> >>> >>> >>> >>> >>> >>> >> >
