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From Oleg Krayushkin <allight...@gmail.com>
Subject Re: Secondary Index on Boolean column with TTL
Date Thu, 03 Nov 2016 10:40:09 GMT
Thanks a lot, DuyHai!

2016-10-31 19:53 GMT+03:00 DuyHai Doan <doanduyhai@gmail.com>:

> Technically TTL should be handled properly. However, be careful of expired
> data turning into tombstones. For the original table, it may be a tombstone
> on a skinny partition but for the 2nd index, it may be a tombstone set on a
> wide partition and you'll start getting into trouble when reading a
> partition with a lot of them
>
> On Mon, Oct 31, 2016 at 5:08 PM, Oleg Krayushkin <allight.me@gmail.com>
> wrote:
>
>> Hi, DuyHai, thank you.
>>
>> I got the idea of caveat with too low cardinality, but still wondering of
>> possible troubles at the idea to put TTL (months) on indexed column (not
>> bool, say, 100 different values of int).
>>
>> 2016-10-31 16:33 GMT+03:00 DuyHai Doan <doanduyhai@gmail.com>:
>>
>>> http://www.planetcassandra.org/blog/cassandra-native-seconda
>>> ry-index-deep-dive/
>>>
>>> See section E Caveats which applies to your boolean use-case
>>>
>>> On Mon, Oct 31, 2016 at 2:19 PM, Oleg Krayushkin <allight.me@gmail.com>
>>> wrote:
>>>
>>>> Hi,
>>>>
>>>> Is it a good approach to make a boolean column with TTL and build a
>>>> secondary index on it?
>>>> (For example, I want to get rows which need to be updated after a
>>>> certain time, but I don't want, say, to add a filed "update_date" as
>>>> clustering column or to create another table)
>>>>
>>>> In what kind of trouble it could lead me?
>>>>
>>>> Thanks in advance for any suggestions.
>>>>
>>>> --
>>>>
>>>> Oleg Krayushkin
>>>>
>>>
>>>
>>
>>
>> --
>>
>> Oleg Krayushkin
>>
>
>


-- 

Oleg Krayushkin

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