Displaying #cassandra-dev/2017-02-06.log:

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Mon Feb 6 11:28:59 2017  makrusak:Hello, core developers of Cassandra. Is it true that nobody is taking part in Google Summer of Code this year as a mentor. I'm really interested in the Cassandra project(especially interested and have experience in distributed metadata (like gossip)) and eager to take part in GSoC, dive deep into Cassandra internals and make a contribution under mentorship.
Mon Feb 6 11:57:01 2017  spodkowinski:makrusak: this is probably a good question for the dev@cassandra.apache.org mailing list
Mon Feb 6 11:59:10 2017  makrusak:spodkowinski: yes, I plan to write a letter today. Maybe do you have some information about GSoC and Cassandra?
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Mon Feb 6 12:04:20 2017  spodkowinski:how do you know that there won't be any mentors this year?
Mon Feb 6 12:16:38 2017  makrusak:spodkowinski: I met a member of the Datastax Cassandra team and asked him for mentorship on GSoC. He said that he doesn't have enough time and neither do other Datastax developers.
Mon Feb 6 12:17:19 2017  krut:makrusak: not everyone is a DS developer
Mon Feb 6 12:19:46 2017  jasobrown:krut: +1 to that
Mon Feb 6 12:20:07 2017  makrusak:krut: As far as I know the majority of contributions comes from Datastax
Mon Feb 6 12:20:08 2017  jasobrown:(sorry, didn't mean for that to sound rude, if it did)
Mon Feb 6 12:21:33 2017  jasobrown:makrusak: you are correct, DS is responsible for a lot of contributions, but there's others of us floating around :)
Mon Feb 6 12:21:46 2017  krut:i don't know if that's true, but regardless, you should post to dev. there may be non-DS contributors being mentors at GSoC.
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Mon Feb 6 12:27:28 2017  makrusak:krut: all right, thanks for the info.
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Mon Feb 6 15:05:51 2017  sedulam:Hi! Reading the code contribution ("Creating a patch") page at http://cassandra.apache.org/doc/latest/development/patches.html#creating-a-patch I'm left under the impression that we should only create a branch after all the code development has been done, but that way, the community won't be able to contribute beforehand. Am I miunderstanding this or is the community suppose to contribute in a personal fork, before the branch
Mon Feb 6 15:06:29 2017  sedulam:I've never worked collaboratively on git before, so I admit it this misunderstanding might come from my inexperience in git. Still, a clarification would be appreciatted!
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Mon Feb 6 15:09:54 2017  ptnapoleon:All changes happen on personal forks, and are contributed to the mainline as patches, via jira
Mon Feb 6 15:10:10 2017  ptnapoleon:At that point, a committer will merge your patch into the appropriate branches, based on what version your patch is targeting
Mon Feb 6 15:10:13 2017  ptnapoleon:Does that help, sedulam ?
Mon Feb 6 15:10:18 2017  ptnapoleon:Happy to explain more/answer any questions
Mon Feb 6 15:11:50 2017  sedulam:Perfectly! Thanks mate!
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Mon Feb 6 16:10:54 2017  aweisberg:How is it the docs claim "Cassandra supports creating an index on most columns, including a clustering column of a compound primary key or on the partition (primary) key itself." but when you do it you get an error saying you can't. http://pastebin.com/HNYLxsVZ
Mon Feb 6 16:11:37 2017  aweisberg:Is this a doc issue or am I failing at reading comprehension (or CQL?)
Mon Feb 6 16:12:08 2017  ptnapoleon:Seems like a doc issue
Mon Feb 6 16:12:19 2017  ptnapoleon:I dont even understand why you'd create an index on the partition key
Mon Feb 6 16:12:45 2017  aweisberg:To get an index on a different columns within a partition that is different from the row key.
Mon Feb 6 16:13:14 2017  ptnapoleon:Use an MV?
Mon Feb 6 16:13:20 2017  ptnapoleon:Or does that need the entire primary key
Mon Feb 6 16:14:05 2017  ptnapoleon:Also, I was considering the case where you indexed _only_ the primary key, your case makes sense
Mon Feb 6 16:14:09 2017  ptnapoleon:I should have read your paste more closely
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Mon Feb 6 16:15:33 2017  pcmanus:We don't let you create a _built-in_ index on a partition key column if there is only one, as it's kind of stupid.
Mon Feb 6 16:16:01 2017  pcmanus:(you can however create a index on a partition key column if you have a compound partition key, so the doc isn't really wrong)
Mon Feb 6 16:16:10 2017  pcmanus:That's the case you're hitting.
Mon Feb 6 16:16:29 2017  ptnapoleon:I don't see why your index isn't equally served from just creating the index on last_name?
Mon Feb 6 16:16:40 2017  ptnapoleon:Your queries are still of the form "WHERE user_id = ? and last_name = ?"
Mon Feb 6 16:17:03 2017  pcmanus:Obviously, that's kind of a bug with custom indexes, you shouldn't be hitting that exception since 1) we don't know what your index does and 2) you're not indexing just one column anyway.
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Mon Feb 6 16:21:23 2017  beobal:yes, it's a bug in CreateIndexStatement. The check to enforce the PK has only a single component is wrong
Mon Feb 6 16:22:19 2017  beobal:it considers each target in isolation, so it doesn't take into account that you might be creating a custom index on a PK component + something else
Mon Feb 6 16:23:56 2017  beobal:that create statement is missing the custom index class too though, which would also fail validation further down the line
Mon Feb 6 16:25:03 2017  aweisberg:OK thanks. I am still parsing this use case that's been presented to me. I was just checking whether you could create the index since the user said they couldn't and the docs said they could.
Mon Feb 6 16:27:27 2017  aweisberg:I'll file a JIRA for the create statement issue.
Mon Feb 6 16:32:02 2017  aweisberg:https://issues.apache.org/jira/browse/CASSANDRA-13186
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