Guozhang Wang created KAFKA-4468:
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Summary: Correctly calculate the window end timestamp after read
from state stores
Key: KAFKA-4468
URL: https://issues.apache.org/jira/browse/KAFKA-4468
Project: Kafka
Issue Type: Bug
Components: streams
Reporter: Guozhang Wang
When storing the WindowedStore on the persistent KV store, we only use the
start timestamp of the window as part of the combo-key as (start-timestamp,
key). The reason that we do not add the end-timestamp as well is that we can
always calculate it from the start timestamp + window_length, and hence we can
save 8 bytes per key on the persistent KV store.
However, after read it (via {{WindowedDeserializer}}) we do not set its end
timestamp correctly but just read it as an {{UnlimitedWindow}}. We should fix
this by calculating its end timestamp as mentioned above.
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