KafkaStreams: Sequential access vs time-bound in SessionStore
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When you are Materializing a Store from a SessionWindowKStream, it forces you to do it as a SessionStore by setting
Materialized<K,VR,SessionStore<org.apache.kafka.common.utils.Bytes,byte>> materialized).
So what you get is a SessionStore<org.apache.kafka.common.utils.Bytes,byte>.
In this type of store, you can fetch by key, but not by key and time as in a WindowStore, even of the key type is a Windowed<K>. So you would have to iterate through it to find the time-related entries, which should be less efficient than querying by time.
How can you use the aggregated session store of Windowed<K> in order to query the store with (key, time)?
Or, put differently, why is there no findSessions-like methods (i.e. time-bound access) in ReadOnlySessionStore, while there is in SessionStore?
apache-kafka apache-kafka-streams
asked Nov 12 at 11:24
xmar
349113
add a comment |
up vote
1
down vote
favorite
When you are Materializing a Store from a SessionWindowKStream, it forces you to do it as a SessionStore by setting
Materialized<K,VR,SessionStore<org.apache.kafka.common.utils.Bytes,byte>> materialized).
So what you get is a SessionStore<org.apache.kafka.common.utils.Bytes,byte>.
In this type of store, you can fetch by key, but not by key and time as in a WindowStore, even of the key type is a Windowed<K>. So you would have to iterate through it to find the time-related entries, which should be less efficient than querying by time.
How can you use the aggregated session store of Windowed<K> in order to query the store with (key, time)?
Or, put differently, why is there no findSessions-like methods (i.e. time-bound access) in ReadOnlySessionStore, while there is in SessionStore?
apache-kafka apache-kafka-streams
asked Nov 12 at 11:24
xmar
349113
Missing feature. Feel free to create a ticket :)
– Matthias J. Sax
Nov 12 at 21:51
1
issues.apache.org/jira/browse/KAFKA-7622
– xmar
Nov 13 at 17:02
add a comment |
up vote
1
down vote
favorite
up vote
1
down vote
favorite
When you are Materializing a Store from a SessionWindowKStream, it forces you to do it as a SessionStore by setting
Materialized<K,VR,SessionStore<org.apache.kafka.common.utils.Bytes,byte>> materialized).
So what you get is a SessionStore<org.apache.kafka.common.utils.Bytes,byte>.
In this type of store, you can fetch by key, but not by key and time as in a WindowStore, even of the key type is a Windowed<K>. So you would have to iterate through it to find the time-related entries, which should be less efficient than querying by time.
How can you use the aggregated session store of Windowed<K> in order to query the store with (key, time)?
Or, put differently, why is there no findSessions-like methods (i.e. time-bound access) in ReadOnlySessionStore, while there is in SessionStore?
apache-kafka apache-kafka-streams
asked Nov 12 at 11:24
xmar
349113
When you are Materializing a Store from a SessionWindowKStream, it forces you to do it as a SessionStore by setting
Materialized<K,VR,SessionStore<org.apache.kafka.common.utils.Bytes,byte>> materialized).
So what you get is a SessionStore<org.apache.kafka.common.utils.Bytes,byte>.
In this type of store, you can fetch by key, but not by key and time as in a WindowStore, even of the key type is a Windowed<K>. So you would have to iterate through it to find the time-related entries, which should be less efficient than querying by time.
How can you use the aggregated session store of Windowed<K> in order to query the store with (key, time)?
Or, put differently, why is there no findSessions-like methods (i.e. time-bound access) in ReadOnlySessionStore, while there is in SessionStore?
apache-kafka apache-kafka-streams
apache-kafka apache-kafka-streams
asked Nov 12 at 11:24
xmar
349113
asked Nov 12 at 11:24
xmar
349113
asked Nov 12 at 11:24
xmar
349113
asked Nov 12 at 11:24
xmar
349113
asked Nov 12 at 11:24
xmar
349113
349113
Missing feature. Feel free to create a ticket :)
– Matthias J. Sax
Nov 12 at 21:51
1
issues.apache.org/jira/browse/KAFKA-7622
– xmar
Nov 13 at 17:02
add a comment |
Missing feature. Feel free to create a ticket :)
– Matthias J. Sax
Nov 12 at 21:51
1
issues.apache.org/jira/browse/KAFKA-7622
– xmar
Nov 13 at 17:02
Missing feature. Feel free to create a ticket :)
– Matthias J. Sax
Nov 12 at 21:51
Missing feature. Feel free to create a ticket :)
– Matthias J. Sax
Nov 12 at 21:51
1
1
issues.apache.org/jira/browse/KAFKA-7622
– xmar
Nov 13 at 17:02
issues.apache.org/jira/browse/KAFKA-7622
– xmar
Nov 13 at 17:02
add a comment |
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Missing feature. Feel free to create a ticket :)
– Matthias J. Sax
Nov 12 at 21:51
1
issues.apache.org/jira/browse/KAFKA-7622
– xmar
Nov 13 at 17:02