Dear, commiters. Please, pay attention to this KIP and share your opinion.
В Вт, 21/08/2018 в 11:14 -0500, John Roesler пишет:
> I'll solicit more reviews. Let's get at least one committer to chime in
> before we start a vote (since we need their approval anyway).
> -John
>
> On Mon, Aug 20, 2018 at 12:39 PM Nikolay Izhikov <nizhi...@apache.org>
> wrote:
>
> > Hello, Ted.
> >
> > Thanks for the comment.
> >
> > I've edit KIP and change proposal to `windowSize`.
> >
> > Guys, any other comments?
> >
> >
> > В Вс, 19/08/2018 в 14:57 -0700, Ted Yu пишет:
> > > bq. // or just Duration windowSize();
> > >
> > > +1 to the above choice.
> > > The duration is obvious from the return type. For getter methods, we
> >
> > don't
> > > use get as prefix (as least for new code).
> > >
> > > Cheers
> > >
> > > On Sun, Aug 19, 2018 at 8:03 AM Nikolay Izhikov <nizhi...@apache.org>
> >
> > wrote:
> > >
> > > > Hello, John.
> > > >
> > > > Thank you very much for your feedback!
> > > > I've addressed all your comments.
> > > > Please, see my answers and let my know is anything in KIP [1] needs to
> >
> > be
> > > > improved.
> > > >
> > > > > The correct choice is actually "Instant", not> "LocalDateTime"
> > > >
> > > > I've changed the methods proposed in KIP [1] to use Instant.
> > > >
> > > > > I noticed some recent APIs are> missing (see KIP-328)
> > > > > those APIs were just added and have never been released... you can
> >
> > just
> > > >
> > > > replace them.
> > > >
> > > > I've added new methods to KIP [1].
> > > > Not released methods marked for remove.
> > > >
> > > > > any existing method that's already deprecated, don't bother
> > > >
> > > > transitioning it to Duration.
> > > >
> > > > Fixed.
> > > >
> > > > > IllegalArgumentException... we should plan to mention this in the
> > > >
> > > > javadoc for those methods.
> > > >
> > > > Got it.
> > > >
> > > > > In Stores, windowSize and segmentInterval should also be durations.
> > > >
> > > > Fixed.
> > > >
> > > > > StreamsMetrics, recordLatency ... this one is better left alone.
> > > >
> > > > OK. I removed this method from KIP [1].
> > > >
> > > > Two more questions question about implementation:
> > > >
> > > > 1. We have serveral methods without parameters.
> > > > In java we can't have two methods with parameters with the same name.
> > > > It wouldn't compile.
> > > > So we have to rename new methods. Please, see suggested names and share
> > > > your thoughts:
> > > >
> > > > Windows {
> > > > long size() -> Duration windowSize();
> > > > }
> > > >
> > > > Window {
> > > > long start() -> Instant startTime();
> > > > long end() -> Instant endTime();
> > > > }
> > > >
> > > > SessionWindows {
> > > > long inactivityGap() -> Duration inactivityGapDuration();
> > > > }
> > > >
> > > > TimeWindowedDeserializer {
> > > > Long getWindowSize() -> Duration getWindowSizeDuration(); // or
> >
> > just
> > > > Duration windowSize();
> > > > }
> > > >
> > > > SessionBytesStoreSupplier {
> > > > long retentionPeriod() -> Duration retentionPeriodDuration();
> > > > }
> > > >
> > > > WindowBytesStoreSupplier {
> > > > long windowSize() -> Duration windowSizeDuration();
> > > > long retentionPeriod() -> Duration retentionPeriodDuration();
> > > > }
> > > >
> > > > 2. Do we want to use Duration and Instant inside API implementations?
> > > >
> > > > IGNITE-7277: "Durations potentially worsen memory pressure and gc
> > > > performance, so internally, we will still use longMs as the
> >
> > representation."
> > > > IGNITE-7222: Duration used to store retention.
> > > >
> > > > [1]
> > > >
> >
> > https://cwiki.apache.org/confluence/display/KAFKA/KIP-358%3A+Migrate+Streams+API+to+Duration+instead+of+long+ms+times
> > > > [2]
> > > >
> >
> > https://github.com/apache/kafka/commit/b3771ba22acad7870e38ff7f58820c5b50946787#diff-47289575d3e3e2449f27b3a7b6788e1aR64
> > > >
> > > > В Пт, 17/08/2018 в 14:46 -0500, John Roesler пишет:
> > > > > Hi Nikolay,
> > > > >
> > > > > Thanks for this very nice KIP!
> > > > >
> > > > > To answer your questions:
> > > > > 1. Correct, we should not delete existing methods that have been
> > > >
> > > > released,
> > > > > but ...
> > > > >
> > > > > 2. Yes, we should deprecate the 'long' variants so that we can drop
> >
> > them
> > > > > later on. Personally, I like to mention which version deprecated the
> > > >
> > > > method
> > > > > so everyone can see later on how long it's been deprecated, but this
> >
> > may
> > > >
> > > > be
> > > > > controversial, so let's let other weigh in.
> > > > >
> > > > > 3. I think you're asking whether it's appropriate to drop the "Ms"
> > > >
> > > > suffix,
> > > > > and I think yes. So "long inactivityGapMs" would become "Duration
> > > > > inactivityGap".
> > > > > In the places where the parameter's name is just "duration", I think
> >
> > we
> > > >
> > > > can
> > > > > pick something more descriptive (I realize it was already
> >
> > "durationMs";
> > > > > this is just a good time to improve it).
> > > > > Also, you're correct that we shouldn't use a Duration to represent a
> > > >
> > > > moment
> > > > > in time, like "startTime". The correct choice is actually "Instant",
> >
> > not
> > > > > "LocalDateTime", though.
> > > > >
> > > >
> > > >
> >
> > https://stackoverflow.com/questions/32437550/whats-the-difference-between-instant-and-localdatetime
> > > > > explains why.
> > > > >
> > > > > I also had a few notes on the KIP itself:
> > > > > 4. You might want to pull trunk again. I noticed some recent APIs are
> > > > > missing (see KIP-328).
> > > > >
> > > > > 5. Speaking of KIP-328: those APIs were just added and have never
> >
> > been
> > > > > released, so there's no need to deprecate the methods, you can just
> > > >
> > > > replace
> > > > > them.
> > > > >
> > > > > 6. For any existing method that's already deprecated, don't bother
> > > > > transitioning it to Duration. I think the examples I noticed were
> > > > > deprecated in KIP-328, so you'll see what I'm talking about when you
> >
> > pull
> > > > > trunk again.
> > > > >
> > > > > 7. Any method taking a Duration argument may throw an
> > > > > IllegalArgumentException (we choose to convert ArithmeticException to
> > > > > IllegalArgumentException, as I mentioned in the Jira ticket). We
> >
> > don't
> > > >
> > > > need
> > > > > a "throws" declaration, but we should plan to mention this in the
> >
> > javadoc
> > > > > for those methods.
> > > > >
> > > > > 8. In Stores, windowSize and segmentInterval should also be
> >
> > durations.
> > > > >
> > > > > 9. In StreamsMetrics, recordLatency could be just a Duration, but I
> > > > > actually think this one is better left alone. IMO, it's more effort
> >
> > for
> > > > > little gain to require users to construct a Duration before they
> >
> > call the
> > > > > method, since they vary likely call System.currentTimeNanos before
> >
> > and
> > > > > after the code in question.
> > > > >
> > > > > These are quite a few notes, but they're all minor. Overall the KIP
> >
> > looks
> > > > > really good to me. Thanks for picking this up!
> > > > > -John
> > > > >
> > > > > On Thu, Aug 16, 2018 at 9:55 AM Nikolay Izhikov <nizhi...@apache.org
> > > >
> > > > wrote:
> > > > >
> > > > > > Hello, Kafka developers.
> > > > > >
> > > > > > I would like to start a discussion of KIP-358 [1].
> > > > > > It based on a ticket KAFKA-7277 [2].
> > > > > >
> > > > > > I crawled through Stream API and made my suggestions for API
> >
> > changes.
> > > > > >
> > > > > > I have several questions about changes.
> > > > > > Please, share your comments:
> > > > > >
> > > > > > 1. I propose do not remove existing API methods with long ms
> > > >
> > > > parameters.
> > > > > > Is it correct?
> > > > > >
> > > > > > 2. Should we mark existing methods as deprecated?
> > > > > >
> > > > > > 3. Suggested changes in ticket description are `long durationMs` to
> > > > > > `Duration duration` and similar.
> > > > > > I suggest to change 'long startTimeMs` to `LocalDateTime startTime`
> > > >
> > > > also.
> > > > > > Should we do it?
> > > > > >
> > > > > > Please, note, it very first KIP for me, so tell me if I miss
> >
> > something
> > > > > > obvious for experienced Kafka developers.
> > > > > >
> > > > > > [1]
> > > > > >
> > > >
> > > >
> >
> > https://cwiki.apache.org/confluence/display/KAFKA/KIP-358%3A+Migrate+Streams+API+to+Duration+instead+of+long+ms+times
> > > > > > [2] https://issues.apache.org/jira/browse/KAFKA-7277
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