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  1. Debezium
  2. DBZ-7441

Adhoc snapshots are not triggered via File channel signal when submitted before the start of the application

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      Bug report

      What Debezium connector do you use and what version?

      Debezium 2.5.1.Final (Postgres connector

      What is the connector configuration?

      offset.storage=org.apache.kafka.connect.storage.FileOffsetBackingStore
      offset.storage.file.filename=/debezium_engine_wrapper/testing_config/state.dat
      offset.flush.interval.ms=0
      connector.class=io.debezium.connector.postgresql.PostgresConnector
      database.hostname=localhost
      database.port=5432
      database.user=postgres
      database.password=postgres
      database.dbname=postgres
      snapshot.mode=initial
      schema.include.list=inventory
      table.include.list=inventory.customers,inventory.orders,inventory.products
      publication.autocreate.mode=filtered
      plugin.name=pgoutput
      snapshot.max.threads=1
      signal.enabled.channels=file,source
      signal.data.collection=inventory.debezium_signal
      signal.file=/debezium_engine_wrapper/testing_config/signal-file.jsonl 

      What is the captured database version and mode of depoyment?

      PostgreSQL 15.2, Debian, docker
      What behaviour do you expect?

      I restart the connector to continue from the offset. At the same time signal file is provided that already contains signals to perform adhoc snapshots. I expect the snapshots to be triggered (both INCREMENTAL or BLOCKING)

      What behaviour do you see?

      When triggering incremental snapshots the snapshot fails with error: Incremental snapshot is not properly configured, either sinalling data collection is not provided or connector-specific snapshotting not set

      When triggering BLOCKING snapshot the signal is registered but not triggered.

      NOTE: This is a timing issue. If I add these signals into the file channel some time after the connector startup, everything works fine.

      More information in the related discussion .

      Do you see the same behaviour using the latest relesead Debezium version?

      Yes,  in 2.5.1.Final

      Do you have the connector logs, ideally from start till finish?

      (You might be asked later to provide DEBUG/TRACE level log)

      <Your answer>

      How to reproduce the issue using our tutorial deployment?

      I am able to reproduce it also using debezium server against the sample Debezium postgre image. With the following config

       

      ezium.source.connector.class=io.debezium.connector.postgresql.PostgresConnector
      debezium.source.offset.storage.file.filename=/debezium-server/data/offsets.dat
      debezium.source.offset.flush.interval.ms=0
      debezium.source.database.hostname=localhost
      debezium.source.database.port=5432
      debezium.source.database.user=postgres
      debezium.source.database.password=postgres
      debezium.source.database.dbname=postgres
      debezium.source.database.server.name=tutorial
      debezium.source.schema.whitelist=inventory
      debezium.source.table.include.list=inventory.customers,inventory.products
      debezium.source.plugin.name=pgoutput
      debezium.source.topic.prefix=testcdc
      debezium.sink.type=http
      debezium.sink.http.url=http://localhost:8000/log_messages
      debezium.sink.http.headers.Content-Type=application/json
      debezium.format.value=json
      debezium.format.key=json
      debezium.source.signal.enabled.channels=source,file
      debezium.source.signal.data.collection=inventory.debezium_signal
      debezium.source.signal.file=/debezium-server/conf/signal-file.jsonl
      quarkus.log.level=trace
      quarkus.log.console.json=false
      debezium.source.snapshot.mode=initial
      debezium.source.snapshot.locking.mode=none 

       

       

      Steps:

      1. Run once (init load)
      2. Stop the server
      3. Add signal into the signal-file.jsonl. Any of the following (or BLOCKING version):
        1. Unknown macro: {"id"}

          }

      4. Run the server again
      5. The snapshot fails or is not executed.

            rh-ee-mvitale Mario Fiore Vitale
            esnerda David Esne (Inactive)
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              Created:
              Updated:
              Resolved: