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https://issues.apache.org/jira/browse/METRON-1644?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16535213#comment-16535213
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ASF GitHub Bot commented on METRON-1644:
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Github user cestella commented on the issue:

    https://github.com/apache/metron/pull/1084
  
    Ok, more javadocs is definitely fair.  I went through the core abstractions 
and added javadocs.  If I missed anything, let me know.


> Support parser chaining
> -----------------------
>
>                 Key: METRON-1644
>                 URL: https://issues.apache.org/jira/browse/METRON-1644
>             Project: Metron
>          Issue Type: Improvement
>            Reporter: Casey Stella
>            Priority: Major
>
> Currently we have only one layer of parsing prior to enrichment, but often 
> real data is more complex.  For instance, often data is wrapped in an 
> envelope (e.g. syslog data which contains a field which needs to be parsed).
> This Jira allows us to support a DAG of parsers prior to enrichment by 
> allowing us to provide a strategy for interpreting what is data and what is 
> metadata in the parser bolt.  This enables upstream parsers to pass in a JSON 
> Blob which contains the metadata and have the parser bolt choose which field 
> is the data to be parsed, the remaining fields would be considered metadata 
> (and merged into the resulting data or not depending on our existing rules 
> for handling metadata).
>  
> To illustrate this better, I've provided a use-case with an example.  Note, 
> this PR depends on METRON-1643 and METRON-1642, so those should be reviewed 
> prior to this.



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