Kyle Winkelman created KAFKA-5172:
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Summary: 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
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()).
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