Christian Tzolov created GEODE-3840:
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Summary: Explain the role of the Filters in the FunctionService
execution
Key: GEODE-3840
URL: https://issues.apache.org/jira/browse/GEODE-3840
Project: Geode
Issue Type: Improvement
Components: docs
Reporter: Christian Tzolov
To direct a query to specific partitioned region node, this query needs to be
executed within a function. The function filters configuration is used to
specify on which partitions this function should be run:
{code:java}
FunctionService
.onRegion(region)
.setArguments(qStr)
.withFilter(filter)
.execute(func);
{code}
The "Querying a Partitioned Region on a Single Node" chapter is unclear about
the role of the Filters and the way they work.
For example it is not clear that conceptually a Filter stands for a *Partitions
Reference/Pointer*. Furthermore this reference is not to a Partition Id (such
doesn't exist) but the partition is identified by a member key that belongs to
this Partition. In other words the Filter should contain an Key that when
evaluated by the PartitionResolver will produce a routing-key pointing to the
target resolver.
>From implementation stand point it is important to be mentioned that the
>Filter values are evaluated by exactly the same PartitionResolver used by all
>other region operations.
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