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From "Brian ONeill (JIRA)" <>
Subject [jira] [Updated] (CASSANDRA-8910) Conditional update based on UDF
Date Wed, 04 Mar 2015 21:55:38 GMT


Brian ONeill updated CASSANDRA-8910:
    Summary: Conditional update based on UDF  (was: Conditional update by UDF)

> Conditional update based on UDF
> -------------------------------
>                 Key: CASSANDRA-8910
>                 URL:
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: Brian ONeill
>            Priority: Minor
> Building on what is suggested by: CASSANDRA-8488
> It would be great if conditional updates could accept a UDF in the IF clause.
> Use Case:
> We are doing real-time in-memory aggregations across many machines.  We want to update
a value (e.g. a dimensional count), but we only want the update applied if that time bucket
has not already been incorporated by another machine. (protecting against partitioning, replays,
> In this case, we want something like:
> UPDATE value=v, slices+="1123213222-30" IF not_contains(slices, 1123213222-30) 
> Where "slices" is a column that contains all time slices, and 112313222-30 represents
a slice of time (start time, plus interval).

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