Jyothsna Konisa created CASSANALYTICS-191:
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Summary: CDC reader stats silently dropped in SidecarCdcBuilder
Key: CASSANALYTICS-191
URL: https://issues.apache.org/jira/browse/CASSANALYTICS-191
Project: Apache Cassandra Analytics
Issue Type: Improvement
Reporter: Jyothsna Konisa
SidecarCdcBuilder's constructor accepts an ICdcStats cdcStats parameter, but
never assigns it to this.stats or calls withStats(cdcStats). CdcBuilder's own
constructor (the superclass) also never sets stats — the field stays at its
declaration default, ICdcStats stats = ICdcStats.STUB (a no-op anonymous
implementation).
As a result, every Cdc/SidecarCdc instance built via SidecarCdc.builder(...)
uses ICdcStats.STUB internally, regardless of what stats implementation the
caller supplies. All ICdcStats calls made from CdcScannerBuilder,
MicroBatchIterator, and BufferingCommitLogReader (produced/received latency,
mutations read, dropped/corrupt mutations, watermarker size,
insufficient-replicas, late-publish, commit-log read timing, etc.) execute
against the no-op stub and never reach the caller's real implementation. Since
the interface's default methods have empty bodies, this produces zero errors,
zero log output, and zero indication anything is wrong.
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