That does make sense. But KIP-93 does not change anything like this, so there is nothing to mention, IMHO.
Or do you mean, the KIP should include that the change is backward compatible with this regard? -Matthias On 11/24/16 5:31 PM, Guozhang Wang wrote: > What I meant is that, for some changes (e.g. say we change the > auto-repartition behavior that caused using different name conventions, or > some changes that involve changing the underlying state store names, etc) > the existing internal state including the stores and topics will probably > not valid. Some users consider this also as a "backward incompatible > change" since they cannot just swipe in the new jar and restart. > > > Guozhang > > > On Wed, Nov 23, 2016 at 3:20 PM, Matthias J. Sax <matth...@confluent.io> > wrote: > >> Thanks for the feedback. I updated the KIP for (1) and (2). >> >> However not for (3): Why should it be required to reset an application? >> If user processed "good" data with valid timestamps, behavior does not >> change. If user tried to process "bad" data with invalid timestamps, the >> application does fail currently anyway, so there is nothing to reset. >> >> >> -Matthias >> >> On 11/22/16 9:53 AM, Guozhang Wang wrote: >>> Regarding the "compatibility" section, I would suggest being a bit more >>> specific about why it is a breaking change. For Streams, it could mean >>> different things: >>> >>> 1. User need code change when switching library dependency on the new >>> version, otherwise it won't compile(I think this is the case for this >> KIP). >>> 2. User need code change when switching library dependency on the new >>> version, otherwise runtime exception will be thrown. >>> 3. Existing application state as well as internal topics need to be >> swiped >>> and the program need to restart from zero. >>> >>> >>> Guozhang >>> >>> On Fri, Nov 18, 2016 at 12:27 PM, Matthias J. Sax <matth...@confluent.io >>> >>> wrote: >>> >>>> Hi all, >>>> >>>> I want to start a discussion about KIP-93: >>>> >>>> https://cwiki.apache.org/confluence/display/KAFKA/KIP- >>>> 93%3A+Improve+invalid+timestamp+handling+in+Kafka+Streams >>>> >>>> Looking forward to your feedback. >>>> >>>> >>>> -Matthias >>>> >>>> >>> >>> >> >> > >
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