Matt Stump created CASSANDRA-9193:
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Summary: Facility to write dynamic code to selectively trigger
trace or log for queries
Key: CASSANDRA-9193
URL: https://issues.apache.org/jira/browse/CASSANDRA-9193
Project: Cassandra
Issue Type: New Feature
Reporter: Matt Stump
I want the equivalent of dtrace for Cassandra. I want the ability to intercept
a query with a dynamic script (assume JS) and based on logic in that script
trigger the statement for trace or logging.
Examples
- Trace only INSERT statements to a particular CF.
- Trace statements for a particular partition or consistency level.
- Log statements that fail to reach the desired consistency for read or write.
- Log If the request size for read or write exceeds some threshold
At some point in the future it would be helpful to also do things such as log
partitions greater than X bytes or Z cells when performing compaction.
Essentially be able to inject custom code dynamically without a reboot to the
different stages of C*.
The code should be executed synchronously as part of the monitored task, but we
should provide the ability to log or execute CQL asynchronously from the
provided API.
Further down the line we could use this functionality to modify/rewrite
requests or tasks dynamically.
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