[ https://issues.apache.org/jira/browse/KAFKA-5172?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Guozhang Wang reassigned KAFKA-5172: ------------------------------------ Assignee: Kyle Winkelman > CachingSessionStore doesn't fetchPrevious correctly. > ---------------------------------------------------- > > Key: KAFKA-5172 > URL: https://issues.apache.org/jira/browse/KAFKA-5172 > Project: Kafka > Issue Type: Bug > Components: streams > Reporter: Kyle Winkelman > Assignee: Kyle Winkelman > > When using KStreamSessionWindowAggregate by calling > KGroupedStream#aggregate() a CachingSessionStore is created. > This causes the following chain of method calls when a new record that > requires removing others from the store appear: > KStreamSessionWindowAggregate > CachingSessionStore.remove(Windowed<K>) > CachingSessionStore.put(Windowed<K>, V) > ThreadCache.put(String, Bytes *containing Windowed<K> info*, LRUCacheEntry) > ThreadCache.maybeEvict(String) > NamedCache.evict() > NamedCache.flush(LRUNode *containing Bytes and LRUCacheEntry from > ThreadCache#put*) > DirtyEntryFlushListener *defined in CachingSessionStore line 80* > .apply(ThreadCache.DirtyEntry *containing Bytes and LRUCacheEntry from > ThreadCache#put*) > CachingSessionStore.putAndMaybeForward(ThreadCache.DirtyEntry *containing > Bytes and LRUCacheEntry from ThreadCache#put*, InternalProcessorContext) > CachingSessionStore.fetchPrevious(Bytes *containing Windowed<K> info*) > RocksDBSessionStore.fetch(Bytes *containing Windowed<K> info*) > RocksDBSessionStore.findSessions *on line 48* (Bytes *containing Windowed<K> > info*, 0, Long.MAX_VALUE) > MeteredSegmentedByteStore.fetch(Bytes *containing Windowed<K> info*, 0, > Long.MAX_VALUE) > ChangeLoggingSegmentedByteStore.fetch(Bytes *containing Windowed<K> info*, 0, > Long.MAX_VALUE) > RocksDBSegmentedBytesStore.fetch(Bytes *containing Windowed<K> info*, 0, > Long.MAX_VALUE) > SessionKeySchema.lower/upperRange(Bytes *containing Windowed<K> info*, Long) > ****** in this method the already Windowed<K> gets Windowed again ***** > The point of showing all this is to point out that the windowed gets windowed > and because it passes the 0, Long.MAX_VALUE it searches for a strange key and > searches all times for it. I think the fetchPrevious method of > CachingSessionStore should be changed to call the > byteStores.findSessions(Bytes.wrap(serdes.rawKey(key.key())), > key.window().start(), key.window().end()). -- This message was sent by Atlassian JIRA (v6.3.15#6346)