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From Damian Guy <damian....@gmail.com>
Subject Re: Setting up Kafka & Kafka Streams for loading real-time and 'older' data concurrently
Date Tue, 02 May 2017 17:08:11 GMT
Hi Garret,

No, log.retention.hours doesn't impact compacted topics.

Thanks,
Damian

On Tue, 2 May 2017 at 18:06 Garrett Barton <garrett.barton@gmail.com> wrote:

> Thanks Damian,
>
> Does setting log.retention.hours have anything to do with compacted
> topics?  Meaning would a topic not compact now for 90 days? I am thinking
> all the internal topics that streams creates in the flow.  Having recovery
> through 90 days of logs would take a good while I'd imagine.
>
> Thanks for clarifying that the until() does in fact set properties against
> the internal topics created.  That makes sense.
>
> On Tue, May 2, 2017 at 11:44 AM, Damian Guy <damian.guy@gmail.com> wrote:
>
> > Hi Garret,
> >
> >
> > > I was running into data loss when segments are deleted faster than
> > > downstream can process.  My knee jerk reaction was to set the broker
> > > configs log.retention.hours=2160 and log.segment.delete.delay.ms=
> > 21600000
> > > and that made it go away, but I do not think this is right?
> > >
> > >
> > I think setting log.retention.hours to 2160 is correct (not sure about
> > log.segment.delete.delay.ms) as segment retention is based on the record
> > timestamps. So if you have 90 day old data you want to process then you
> > should set it to at least 90 days.
> >
> >
> > > For examples sake, assume a source topic 'feed', assume a stream to
> > > calculate min/max/avg to start with, using windows of 1 minute and 5
> > > minutes.  I wish to use the interactive queries against the window
> > stores,
> > > and I wish to retain 90 days of window data to query.
> > >
> > So I need advice for configuration of kafka, the 'feed' topic, the store
> > > topics, and the stores themselves.
> > >
> > >
> > When you create the Windows as part of the streams app you should specify
> > them something like so: TimeWindows.of(1minute).until(90days) - in this
> > way
> > the stores and underling changelog topics will be configured with the
> > correct retention periods.
> >
> > Thanks,
> > Damian
> >
>

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