Yifan Cai created CASSANDRA-17666:
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Summary: Option to disable write path during streaming for CDC
enabled tables
Key: CASSANDRA-17666
URL: https://issues.apache.org/jira/browse/CASSANDRA-17666
Project: Cassandra
Issue Type: Improvement
Reporter: Yifan Cai
Assignee: Yifan Cai
For the CDC-enabled tables, a special write path is employed during streaming.
The mutations streamed are written into commit log first.
There are scenarios that the commit logs can accumulate, which lead to failure
of streaming and blocking writes.
I'd like to propose adding a dynamic toggle to disable the special write path
for CDC during streaming.
Please note that the toggle is a trade-off. Because the special write path is
there in the hope to ensure data consistency. Turning it off allows the
streaming to pass, but in some extreme scenarios, the downstream CDC consumers
may have holes in the stream, depending on how they consumes the commit logs.
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