org.apache.hadoop.hive.ql.exec.tez.QueryAllocationManager Maven / Gradle / Ivy
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* to you under the Apache License, Version 2.0 (the
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* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
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*/
package org.apache.hadoop.hive.ql.exec.tez;
import java.util.List;
/**
* Represents the mapping from logical resource allocations to queries from WM, to actual physical
* allocations performed using some implementation of a scheduler.
*/
interface QueryAllocationManager {
void start();
void stop();
/**
* Updates the session allocations asynchronously.
* @param totalMaxAlloc The total maximum fraction of the cluster to allocate. Used to
* avoid various artifacts, esp. with small numbers and double weirdness.
* Null means the total is unknown.
* @param sessions Sessions to update based on their allocation fraction.
* @return The number of executors/cpus allocated.
*/
int updateSessionsAsync(Double totalMaxAlloc, List sessions);
/**
* @return the number of CPUs equivalent to percentage allocation, for information purposes.
*/
int translateAllocationToCpus(double allocation);
/**
* Sets a callback to be invoked on cluster changes relevant to resource allocation.
*/
void setClusterChangedCallback(Runnable clusterChangedCallback);
/**
* Updates the session asynchronously with the existing allocation.
*/
void updateSessionAsync(WmTezSession session);
}