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4. The Snapshot time interval field denotes how often the state of the processing engine should be persisted, which is used to restore after a system crash. The value '0' (the default value) here disables this feature.
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If snapshot is enabled, the CEP server should be started with the embedded cassandra server enabled. This can be done by specifying the -Ddisable.cassandra.server.startup=false option at server startup. |
5. When writing query expressions (See Siddhi Language specification on how to write queries), users need to import the required streams from Event Builders. The As field maps the incoming stream to a stream name suitable for the Siddhi processing engine. Note that the As field can contain only alphanumeric characters and '_' character.
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