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https://issues.apache.org/jira/browse/NIFI-4105?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16067974#comment-16067974
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ASF GitHub Bot commented on NIFI-4105:
--------------------------------------
Github user pvillard31 commented on a diff in the pull request:
https://github.com/apache/nifi/pull/1937#discussion_r124733832
--- Diff:
nifi-nar-bundles/nifi-cassandra-bundle/nifi-cassandra-processors/src/main/java/org/apache/nifi/processors/cassandra/QueryCassandra.java
---
@@ -75,19 +81,64 @@
@Tags({"cassandra", "cql", "select"})
@EventDriven
@InputRequirement(InputRequirement.Requirement.INPUT_ALLOWED)
-@CapabilityDescription("Execute provided Cassandra Query Language (CQL)
select query on a Cassandra 1.x, 2.x, or 3.0.x cluster. Query result "
- + "may be converted to Avro or JSON format. Streaming is used so
arbitrarily large result sets are supported. This processor can be "
+@CapabilityDescription("Executes provided Cassandra Query Language (CQL)
select query on a Cassandra to fetch all rows whose values"
--- End diff --
A bit confused by the wording, maybe something like:
> Executes provided Cassandra Query Language (CQL) select query on a
Cassandra 1.x, 2.x, or 3.0.x cluster. In addition, incremental fetching can be
achieved by setting Maximum-Value Columns, which causes the processor to track
the columns' maximum values, thus only fetching rows whose columns' values
exceed the observed maximums. This processor is intended to be run on the
Primary Node only.
Also be careful with the white spaces.
In my proposition I'm talking about multiple maximum column values, but it
seems you only accept one column. You can have a look at GenerateTableFetch
processor where a user can define multiple columns to track new rows.
> support the specified Maximum value column and CSV Stream for Cassandra
> -----------------------------------------------------------------------
>
> Key: NIFI-4105
> URL: https://issues.apache.org/jira/browse/NIFI-4105
> Project: Apache NiFi
> Issue Type: Improvement
> Components: Extensions
> Affects Versions: 1.3.0
> Reporter: Yoonwon Ko
>
> I'm trying to find a CassandraProcessor to fetch rows whose values in the
> specified Maximum Value columns are larger than the previously-seen maximum
> like QueryDatabaseTable.
> But I found only QueryCassandra. It just executes same CQL everytime without
> keeping maximum value.
> and I think we also need convertToCsvStream option.
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