com.facebook.presto.jdbc.internal.spi.ConnectorSplit Maven / Gradle / Ivy
/*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.facebook.presto.jdbc.internal.spi;
import com.facebook.presto.jdbc.internal.spi.schedule.NodeSelectionStrategy;
import java.util.List;
import java.util.OptionalLong;
public interface ConnectorSplit
{
/**
* Indicate the node affinity of a Split
* 1. HARD_AFFINITY: Split is NOT remotely accessible and has to be on specific nodes
* 2. SOFT_AFFINITY: Connector split provides a list of preferred nodes for engine to pick from but not mandatory.
* 3. NO_PREFERENCE: Split is remotely accessible and can be on any nodes
*/
NodeSelectionStrategy getNodeSelectionStrategy();
/**
* Provide a list of preferred nodes for scheduler to pick.
* 1. The scheduler will respect the preference if the strategy is HARD_AFFINITY.
* 2. Otherwise, the scheduler will prioritize the provided nodes if the strategy is SOFT_AFFINITY.
* But there is no guarantee that the scheduler will pick them if the provided nodes are busy.
* 3. Empty list indicates no preference.
*/
List getPreferredNodes(NodeProvider nodeProvider);
Object getInfo();
default Object getSplitIdentifier()
{
return this;
}
default OptionalLong getSplitSizeInBytes()
{
return OptionalLong.empty();
}
default SplitWeight getSplitWeight()
{
return SplitWeight.standard();
}
}