[jira] [Created] (FLINK-37508) Postgres CDC Jdbc query should use debezium.snapshot.fetch.size rather than debezium.query.fetch.size.

[Hongshun Wang (Jira)]

Hongshun Wang created FLINK-37508:
-------------------------------------

             Summary: Postgres CDC Jdbc query should use 
debezium.snapshot.fetch.size rather than  debezium.query.fetch.size.
                 Key: FLINK-37508
                 URL: https://issues.apache.org/jira/browse/FLINK-37508
             Project: Flink
          Issue Type: Improvement
          Components: Flink CDC
    Affects Versions: cdc-3.3.0
            Reporter: Hongshun Wang
             Fix For: cdc-3.4.0


In debezium postgres connector, [{{snapshot.fetch.size 
}}|https://debezium.io/documentation//reference/2.7/connectors/postgresql.html#postgresql-property-snapshot-fetch-size]specifies
 the maximum number of rows in a batch(defalut value is 10240).

{{However, currently in pg cdc, use query.size(which is not a param of debezium 
postgres connector, the defalut value is 0, meaning read a without a fetch 
size).}}
{code:java}
PostgresQueryUtils.readTableSplitDataStatement(
        jdbcConnection,
        selectSql,
        snapshotSplit.getSplitStart() == null,
        snapshotSplit.getSplitEnd() == null,
        snapshotSplit.getSplitStart(),
        snapshotSplit.getSplitEnd(),
        snapshotSplit.getSplitKeyType().getFieldCount(),
        connectorConfig.getQueryFetchSize()); {code}
{{}}

{{}}



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