Jon, You should be able to query anything that has not expired, i.e., based on TimeWindows.until(..).
Thanks, Damian On Wed, 29 Mar 2017 at 17:24 Jon Yeargers <[email protected]> wrote: > To be a bit more specific: > > If I call this: KTable<Window, String> kt = > sourceStream.groupByKey().reduce(..., "somekeystore"); > > and then call this: > > kt.forEach()-> ... > > Can I assume that everything that comes out will be available in > "somekeystore"? If not, what subset should I expect to find there? > > On Wed, Mar 29, 2017 at 8:34 AM, Jon Yeargers <[email protected]> > wrote: > > > But if a key shows up in a KTable->forEach should it be available in the > > StateStore (from the KTable)? > > > > On Wed, Mar 29, 2017 at 6:31 AM, Michael Noll <[email protected]> > > wrote: > > > >> Jon, > >> > >> there's a related example, using a window store and a key-value store, > at > >> https://github.com/confluentinc/examples/blob/3.2.x/kafka- > >> streams/src/test/java/io/confluent/examples/streams/Val > >> idateStateWithInteractiveQueriesLambdaIntegrationTest.java > >> (this is for Confluent 3.2 / Kafka 0.10.2). > >> > >> -Michael > >> > >> > >> > >> On Wed, Mar 29, 2017 at 3:12 PM, Jon Yeargers <[email protected] > > > >> wrote: > >> > >> > Im only running one instance (locally) to keep things simple. > >> > > >> > Reduction: > >> > > >> > KTable<Windowed<String>, String> hourAggStore = > >> > sourceStream.groupByKey().reduce(rowReducer, > >> > TimeWindows.of(65 * 60 * 1000L).advanceBy(5 * 60 * > >> > 1000).until(70 * 60 * 1000L), > >> > "HourAggStore"); > >> > > >> > then I get values to look for via: > >> > > >> > hourAggStore.foreach((k, v) -> { > >> > LogLine logLine = objectMapper.readValue(v, > >> logLine.class); > >> > LOGGER.debug("{}", k.key()); > >> > }); > >> > > >> > Ive kept it easy by requesting everything from 0 to > >> > 'System.currentTimeMillis()'. Retrieval is done using a snip from your > >> > sample code "windowedByKey". > >> > > >> > Requests are sent in via curl and output through the same channel. I > >> pass > >> > in the key and ask for any values. > >> > > >> > Ive looked at the values passed in / out of the reduction function and > >> they > >> > look sane. > >> > > >> > My assumption is that if a value shows up in the 'forEach' loop this > >> > implies it exists in the StateStore. Accurate? > >> > > >> > In fact, only about one in 10 requests actually return any values. No > >> > errors - just no data. > >> > > >> > > >> > > >> > On Wed, Mar 29, 2017 at 2:15 AM, Damian Guy <[email protected]> > >> wrote: > >> > > >> > > Hi Jon, > >> > > > >> > > If you are able to get a handle on the store, i.e., via > >> > > KafkaStreams.store(...) and call fetch without any exceptions, then > >> the > >> > > store is available. > >> > > The time params to fetch are the boundaries to search for windows > for > >> the > >> > > given key. They relate to the start time of the window, so if you > did > >> > > fetch(key, t1, t2) - it will find all the windows for key that start > >> in > >> > the > >> > > inclusive time range t1 - t2. > >> > > > >> > > Are you running more than one instance? If yes, then you want to > make > >> > sure > >> > > that you are querying the correct instance. For that you can use: > >> > > KafkaStreams.metadataForKey(...) to find the instance that has the > >> key > >> > you > >> > > are looking for. > >> > > > >> > > Thanks, > >> > > Damian > >> > > > >> > > > >> > > > >> > > On Tue, 28 Mar 2017 at 22:37 Jon Yeargers <[email protected] > > > >> > > wrote: > >> > > > >> > > > Im probing about trying to find a way to solve my aggregation -> > db > >> > > issue. > >> > > > Looking at the '.fetch()' function Im wondering about the > >> 'timeFrom' > >> > and > >> > > > 'timeTo' params as not a lot is mentioned about 'proper' usage. > >> > > > > >> > > > The test in > >> > > > > >> > > > https://github.com/confluentinc/examples/blob/ > >> > > master/kafka-streams/src/test/java/io/confluent/examples/ > >> > > streams/interactivequeries/WordCountInteractiveQueriesExa > >> > > mpleTest.java#L200-L212 > >> > > > makes it appear that the params are boundaries and that it will > >> return > >> > an > >> > > > inclusive list of every key/window combination. Truth? > >> > > > > >> > > > My tests to this end haven't returned anything. > >> > > > > >> > > > Im watching the values coming out of the KTable<Window, String> > so I > >> > can > >> > > > send them back as request params. What Ive tried: > >> > > > > >> > > > - Window.key(), Window.key().start() and Window.key().end() > >> > > > - Window.key(), (Window.key().start() - 1) and (Window.key().end() > >> + 1) > >> > > > - Window.key(), 0 and Window.key().end() > >> > > > - Window.key(), 0 and (Window.key().end() + 1) > >> > > > > >> > > > None of these seem to hit anything in the StateStore. > >> > > > > >> > > > Is there a delay before Store values become available for > >> '.fetch()'? > >> > > > > >> > > > >> > > >> > > > > >
