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https://issues.apache.org/jira/browse/FLUME-1097?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13261297#comment-13261297
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[email protected] commented on FLUME-1097:
------------------------------------------------------



bq.  On 2012-04-21 04:36:01, Mike Percy wrote:
bq.  > 
flume-ng-core/src/main/java/org/apache/flume/event/SinkEventHeaderDecorator.java,
 line 29
bq.  > <https://reviews.apache.org/r/4826/diff/1/?file=103469#file103469line29>
bq.  >
bq.  >     Does this class belong in the core at all?
bq.  >     
bq.  >     In my view, this class isn't general enough to be checked into the 
Flume core. This should be kept as an application-specific plugin which is 
added to the runtime classpath and referenced in the config. That's sort of the 
point of adding this EventHeaderDecorator plugin interface, right?

Mike,

makes sense. Probably a plugins package might help. It would be nice to ship 
the custom plugins along with FLUME.
I will incorporate the feedback and revert.


- Inder


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On 2012-04-20 10:33:14, Inder Singh wrote:
bq.  
bq.  -----------------------------------------------------------
bq.  This is an automatically generated e-mail. To reply, visit:
bq.  https://reviews.apache.org/r/4826/
bq.  -----------------------------------------------------------
bq.  
bq.  (Updated 2012-04-20 10:33:14)
bq.  
bq.  
bq.  Review request for Flume, Arvind Prabhakar, Mike Percy, and Hari 
Shreedharan.
bq.  
bq.  
bq.  Summary
bq.  -------
bq.  
bq.  Overview of Changes
bq.  
bq.  1.EventHeaderDecorator -> generic class having processHeader()
bq.  2.SinkEventHeaderDecorator is a EventHeaderDecorator which overrides 
timestamp header at this hop.
bq.  3.EventHeaderDecoratorFactory provides EventHeaderDecorator's based on 
<sink>.headerDecorator config
bq.  4.AbstractSink -> has a eventHeaderDecortaor
bq.  5.HDFSEventSink -> checks for decorator through config and calls 
processHeader() for each event which modifies/add headers based on event 
decorator defined through config.
bq.  
bq.  Sample Configuration for testing
bq.  ----------------------------------
bq.  agent1.sinks.log-sink1.hdfs.headerDecorator = sinkDecorator
bq.  
bq.  
bq.  This addresses bug FLUME-1097.
bq.      https://issues.apache.org/jira/browse/FLUME-1097
bq.  
bq.  
bq.  Diffs
bq.  -----
bq.  
bq.    
flume-ng-core/src/main/java/org/apache/flume/event/EventHeaderDecorator.java 
PRE-CREATION 
bq.    
flume-ng-core/src/main/java/org/apache/flume/event/EventHeaderDecoratorFactory.java
 PRE-CREATION 
bq.    
flume-ng-core/src/main/java/org/apache/flume/event/SinkEventHeaderDecorator.java
 PRE-CREATION 
bq.    flume-ng-core/src/main/java/org/apache/flume/sink/AbstractSink.java 
2334059 
bq.    
flume-ng-sinks/flume-hdfs-sink/src/main/java/org/apache/flume/sink/hdfs/HDFSEventSink.java
 1b61cad 
bq.  
bq.  Diff: https://reviews.apache.org/r/4826/diff
bq.  
bq.  
bq.  Testing
bq.  -------
bq.  
bq.  Testing Done
bq.  -------------
bq.  1. Unit tests
bq.  2. manual tests done - agent1.sinks.log-sink1.hdfs.filePrefix = 
flume-data/%D results in publishing data with timestamp at agent's hop running 
HDFSEventSink
bq.  
bq.  
bq.  Thanks,
bq.  
bq.  Inder
bq.  
bq.


                
> Support modification of event Headers through configuration
> -----------------------------------------------------------
>
>                 Key: FLUME-1097
>                 URL: https://issues.apache.org/jira/browse/FLUME-1097
>             Project: Flume
>          Issue Type: New Feature
>            Reporter: Inder SIngh
>            Assignee: Inder SIngh
>            Priority: Minor
>         Attachments: FLUME-1097-1.patch
>
>
> As discussed on the flume threads we want to support adding/modifying headers 
> at flume agents through configuration.
> Primary use-case as of now -
> Use HDFSEventSink to publish data in paths like /flume-data/YYYY/mm/DD/HH/MM 
> wherein timestamp is of agent running HDFSEventSink. 
> What's not there today
> -------------------------
> 1. headers are put by clientLIB and can't be added/modified in flight by 
> agents.

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