Java SDK Documentation  8.1
com.vertica.sdk.NodeSpecifyingPlanContext Class Reference

Interface that allows storage of query-plan state, when different parts of query planning take place on different computers. For example, if some work is done on the query initiator node and some is done on each node executing the query. More...

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Public Member Functions

 NodeSpecifyingPlanContext (ParamWriter writer, ArrayList< String > clusterNodes, boolean canApportionSource)
 
 NodeSpecifyingPlanContext (ParamWriter writer, ArrayList< String > clusterNodes, ArrayList< String > targetNodes, boolean canApportionSource)
 
boolean canApportionSource ()
 
ArrayList< String > getClusterNodes ()
 
ParamReader getReader ()
 
ArrayList< String > getTargetNodes ()
 
ParamWriter getWriter ()
 
void setTargetNodes (ArrayList< String > nodes) throws UdfException
 

Detailed Description

Interface that allows storage of query-plan state, when different parts of query planning take place on different computers. For example, if some work is done on the query initiator node and some is done on each node executing the query.

In addition to the functionality provided by PlanContext, NodeSpecifyingPlanContext allows you to specify which nodes the query should run on. This is used for UDLs.

Member Function Documentation

ArrayList<String> com.vertica.sdk.PlanContext.getClusterNodes ( )
inherited

Get a list of all of the nodes in the current cluster, by node name

ParamReader com.vertica.sdk.PlanContext.getReader ( )
inherited

Get a read-only instance of the current context

ArrayList<String> com.vertica.sdk.NodeSpecifyingPlanContext.getTargetNodes ( )

Return the set of nodes that this query is currently set to run on

ParamWriter com.vertica.sdk.PlanContext.getWriter ( )
inherited

Get the current context for writing

void com.vertica.sdk.NodeSpecifyingPlanContext.setTargetNodes ( ArrayList< String >  nodes) throws UdfException

Change the set of nodes that the query is intended to run on. Throws if any of the specified node names is not actually the name of any node in the cluster.

Exceptions
UdfException