Emit all messages across sequence number gaps in messagesWithBatch (#517)#521
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…pache#517) * Emit all messages across sequence number gaps in messagesWithBatch apache#516 * The query windowing introduced by apache#180 treated a windowed batch returning fewer messages than batchSize as the end of the journal: bounded streams (recovery, currentEventsByPersistenceId) completed early and silently dropped every message beyond a gap left by deleted messages, and live streams stalled forever polling an empty window. apache#195 fixed only the gap at the head of the journal. * Rework the unfoldAsync state from FlowControl into a QueryPlan state machine (QueryRemaining, QueryWindow, PollRemaining, Complete): a short windowed batch is no longer conclusive and falls back to one query over the full remaining range, which gaps cannot hide messages from. * Keep windowing as the dense fast path of apache#180: after a full batch shows the journal to be dense, queries stay bounded to [from, from + batchSize]. * Span the full remaining range on the first query, crossing a deleted journal head (snapshot cleanup) in a single round trip, subsuming the apache#195 special case. * Poll the full remaining range when tailing: a windowed poll can never reach messages appended beyond a trailing gap. * Specify the gap state machine in MessagesWithBatchTest (core, in-memory journal stub) and the database-coupled behavior in MessagesWithBatchDatabaseContractTest (H2 plus the five integration databases): hard and soft deletes, a prefix purge through the journal's delete, and serialization failures. * Use a non-empty writer in the corrupt-row test fixture Oracle treats the empty string as NULL, so inserting the synthetic corrupt row with writer = "" violated the NOT NULL constraint on EVENT_JOURNAL.WRITER (ORA-01400) and failed only the Oracle integration tests. The production write path always carries a writer UUID, so this is a test-fixture-only fix. * Use the standard Apache header on the new test files These files contain no Akka-derived code, so they should carry the full ASF header (the headerLicense the build stamps on new files) rather than the shorter "derived from Akka" variant, per a maintainer review note. * Note batchSize+1 window width in LimitWindowingStreamTest
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Jun 14, 2026
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cherry pick 40cdd6d #517