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Matt Stump commented on CASSANDRA-9193: --------------------------------------- The above example demonstrates the serialized partition key dilemma pretty well. A {{ReadCommand}} has ByteBuffer for key, which can be a serialized composite. I suppose I could provide a function that given a CFMetaData and a key byte buffer return an array of java objects to JS, one object per key component. > 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. -- This message was sent by Atlassian JIRA (v6.3.4#6332)