I prefer option1 with stellar, although I’m concerned that in a real world scenario the amount of filters and rules might be large, and some thought about the structure of the rule expressions for maintainability etc will need to be considered.
On January 12, 2017 at 15:52:03, Casey Stella ([email protected]) wrote: As of METRON-652 <https://github.com/apache/incubator-metron/pull/415>, we will have decoupled the indexing configuration from the enrichment configuration. As an immediate follow-up to that, I'd like to provide the ability to turn off and on writers via the configs. I'd like to get some community feedback on how the functionality should work, if y'all are amenable. :) As of now, we have 3 possible writers which can be used in the indexing topology: - Solr - Elasticsearch - HDFS HDFS is always used, elasticsearch or solr is used depending on how you start the indexing topology. A couple of proposals come to mind immediately: *Index Filtering* You would be able to specify a filter as defined by a stellar statement (likely a reuse of the StellarFilter that exists in the Parsers) which would allow you to indicate on a message-by-message basis whether or not to write the message. The semantics of this would be as follows: - Default (i.e. unspecified) is to pass everything through (hence backwards compatible with the current default config). - Messages which have the associated stellar statement evaluate to true for the writer type will be written, otherwise not. Sample indexing config which would write out no messages to HDFS and write out only messages containing a field called "field1": { "index" : "squid" ,"batchSize" : 100 ,"filters" : { "HDFS" : "false" ,"ES" : "exists(field1)" } } *Index On/Off Switch* A simpler solution would be to just provide a list of writers to write messages. The semantics would be as follows: - If the list is unspecified, then the default is to write all messages for every writer in the indexing topology - If the list is specified, then a writer will write all messages if and only if it is named in the list. Sample indexing config which turns off HDFS and keeps on Elasticsearch: { "index" : "squid" ,"batchSize" : 100 ,"writers" : [ "ES" ] } Thanks in advance for the feedback! Also, if you have any other, better ideas than the ones presented here, let me know too. Best, Casey
