Re: Cassandra and Apache Arrow

2019-01-09 Thread Tomas Bartalos
? There's no mention of > it under https://arrow.apache.org/powered_by/, and on the homepage it > says only says that a Cassandra developer worked on it. > > We (unfortunately) don't do anything with it at the moment. > > On Wed, Jan 9, 2019 at 3:24 PM Tomas Bartalos > wr

Cassandra and Apache Arrow

2019-01-09 Thread Tomas Bartalos
I’ve read lot of nice things about Apache Arrow in-memory columnar format. On their homepage they mention Cassandra as a possible storage which could interoperate with Arrow. Unfortunately I was not able to find any working example which would demonstrate their cooperation. My use case: I’m doi

Re: [EXTERNAL] Howto avoid tombstones when inserting NULL values

2019-01-09 Thread Tomas Bartalos
bstones either. > Compaction will bring multiple tombstones together for a cell in the same way > it compacts multiple values for a single cell. > > I sounds to make like you're taking some advice about tombstones out of > context and trying to apply the advice to a

Re: [EXTERNAL] Howto avoid tombstones when inserting NULL values

2019-01-04 Thread Tomas Bartalos
ing here. Why do you think overwriting a single > cell with a tombstone is any worse than overwriting a single cell with a > value? > > Jon > > > On Fri, Jan 4, 2019 at 9:57 AM Tomas Bartalos > wrote: > >> Hello, >> >> I beleive your approach is the same as

Re: [EXTERNAL] Howto avoid tombstones when inserting NULL values

2019-01-04 Thread Tomas Bartalos
gt; > Disclaiment: I'm the creator of Achilles > > > > On Thu, Dec 27, 2018 at 10:21 PM Tomas Bartalos > wrote: > >> Hello, >> >> The problem is I can't know the combination of set/unset values. From my >> perspective every value should be set

Re: [EXTERNAL] Howto avoid tombstones when inserting NULL values

2018-12-27 Thread Tomas Bartalos
t; Insert into table happening (id, event, a, b, c) values ("MainEvent","The >> most complete info we have right now","Priceless","10 pm","Grand Ballroom"); >> -- b changes >> Insert into happening (id, b) values ("MainEvent",&q

Howto avoid tombstones when inserting NULL values

2018-12-27 Thread Tomas Bartalos
Hello, I’d start with describing my use case and how I’d like to use Cassandra to solve my storage needs. We're processing a stream of events for various happenings. Every event have a unique happening_id. One happening may have many events, usually ~ 20-100 events. I’d like to store only the l