org.apache.hadoop.hive.ql.reexec.IReExecutionPlugin Maven / Gradle / Ivy
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package org.apache.hadoop.hive.ql.reexec;
import org.apache.hadoop.hive.common.classification.InterfaceAudience;
import org.apache.hadoop.hive.common.classification.InterfaceStability;
import org.apache.hadoop.hive.ql.Driver;
import org.apache.hadoop.hive.ql.plan.mapper.PlanMapper;
/**
* Defines an interface for re-execution logics.
*
* FIXME: rethink methods.
*/
@InterfaceAudience.Private
@InterfaceStability.Unstable
public interface IReExecutionPlugin {
/**
* Called when the {@link Driver} is being initialized
*
* The plugin may add hooks/etc to tap into the system.
*/
void initialize(Driver driver);
/**
* Called before executing the query.
*/
void beforeExecute(int executionIndex, boolean explainReOptimization);
/**
* The query have failed, does this plugin advises to re-execute it again?
*/
boolean shouldReExecute(int executionNum);
/**
* The plugin should prepare for the re-compilaton of the query.
*/
void prepareToReExecute();
/**
* The query have failed; and have been recompiled - does this plugin advises to re-execute it again?
*/
boolean shouldReExecute(int executionNum, PlanMapper oldPlanMapper, PlanMapper newPlanMapper);
void afterExecute(PlanMapper planMapper, boolean successfull);
}