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https://issues.apache.org/jira/browse/METRON-1378?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16302876#comment-16302876
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ASF GitHub Bot commented on METRON-1378:
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Github user nickwallen commented on the issue:
https://github.com/apache/metron/pull/879
IMHO, this seems really complex. That JSON configuration looks really
scary to me and sadly I don't think I could bring myself to use this.
Fundamentally the need you are addressing is that you want to manipulate a
text file and leverage Stellar as part of that pipeline, right?
In a perfect world, I'd be able to use Unix-y tools like Grep, Sed, Awk,
etc and introduce Stellar expressions as part of the pipeline. I know it is
already possible to some degree with the REPL.
I am wondering if with a little brainstorming we might be able to arrive at
a simpler solution that allows us to leverage tried-and-true UNIX pipelines so
that people can use the Unix-y tools they are familiar with. I feel we'll get
better user traction with a simpler, more familiar approach.
> Create a summarizer
> -------------------
>
> Key: METRON-1378
> URL: https://issues.apache.org/jira/browse/METRON-1378
> Project: Metron
> Issue Type: Improvement
> Reporter: Casey Stella
>
> We have a nice and generalized infrastructure for loading data into HBase and
> interacting with it via `flatfile_loader.sh` and `ENRICHMENT_GET()`. It is
> also useful to summarize a set of data into a static data structure, store it
> on HDFS and interact with it via stellar. To this end, to complement the
> `flatfile_loader.sh`, we should have a `flatfile_summarizer.sh` that, using
> the same extractor config, will process a flat file and output a serialized
> object.
> The usecase for this is as follows:
> Let's say that I have a static list of domains in the second column of a CSV,
> domains.csv, and I want to generate a bloom filter with those domains in them
> sans TLD.
> I should be able to create a file called `bloom.ser` with the serialized
> bloom filter given the extractor config:
> {code}
> {
> "config" : {
> "columns" : {
> "rank" : 0,
> "domain" : 1
> },
> "value_transform" : {
> "domain" : "DOMAIN_REMOVE_TLD(domain)"
> },
> "value_filter" : "LENGTH(domain) > 0",
> "state_init" : "BLOOM_INIT()",
> "state_update" : {
> "state" : "BLOOM_ADD(state, domain)"
> },
> "state_merge" : "BLOOM_MERGE(states)",
> "separator" : ","
> },
> "extractor" : "CSV"
> }
> {code}
> Note, the associated stellar function `OBJECT_GET` is pending.
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