[jira] [Created] (NIFI-1172) SimpleCache processor

["Toivo Adams (JIRA)" <ji...@apache.org>]

Toivo Adams created NIFI-1172:
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             Summary: SimpleCache processor
                 Key: NIFI-1172
                 URL: https://issues.apache.org/jira/browse/NIFI-1172
             Project: Apache NiFi
          Issue Type: New Feature
          Components: Extensions
            Reporter: Toivo Adams
            Priority: Minor


We have cache controller services. 
Also we have plans to implement State Management.
https://cwiki.apache.org/confluence/display/NIFI/State+Management

Both are very useful for implementing standard and custom processors.

But maybe SimpleCache processor out of the box is also useful?

Consider “Database Lookup Approach” from user mailing list (14-15 nov)

SimpleCache has 2 different inputs. 
One is for request/lookup some value by key.
Second is update and accept key and value.

First request/lookup is invoked. If value is in the cache, Success output will have value.
If not Retrieve output will contain info for query. We connect Query processor to this relationship.
Query processor Success output will be connected back to SimpleCache input for update cache operation after successful query.

SimpleCache can be implemented using LevelDB.
LevelDB is very fast when all data fits in memory. And at the same time supports writing data to disk for bigger amount of data.

Thanks
Toivo



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