| Apache Cassandra User-Defined-Functions JSR 223 scripting |
| ========================================================= |
| |
| Using JSR-223 capable Jython |
| |
| Tested with version 2.3.5 |
| |
| Installation |
| ------------ |
| |
| 1. Download Jython binary release |
| 2. Unpack the downloaded archive into a temporary directory |
| 3. Copy the jar jython.jar from the Jython directory to $CASSANDRA_HOME/lib/jsr223/jython |
| 4. Restart your Cassandra daemon if it's already running |
| |
| Cassandra log should contain a line like this: |
| INFO 10:58:18 Found scripting engine jython 2.5.3 - python 2.5 - language names: [python, jython] |
| Such a line appears when you already have scripted UDFs in your system or add a scripted UDF for the first time (see below). |
| |
| Smoke Test |
| ---------- |
| |
| To test Jython functionality, open cqlsh and execute the following command: |
| CREATE OR REPLACE FUNCTION foobar ( input text ) RETURNS text LANGUAGE python AS '''foo''' ; |
| |
| If you get the error |
| code=2200 [Invalid query] message="Invalid language python for 'foobar'" |
| Jython for Apache Cassandra has not been installed correctly. |
| |
| Notes / Java7 invokedynamic |
| --------------------------- |
| |
| Jython currently targets Java6 only. They want to switch to Java7 + invokedynamic in Jython 3. |
