org.apache.flink.runtime.resourcemanager.autoscale.plugins.detectors.ClusterBlockRequestDetector Maven / Gradle / Ivy
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* to you under the Apache License, Version 2.0 (the
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package org.apache.flink.runtime.resourcemanager.autoscale.plugins.detectors;
import org.apache.flink.api.java.tuple.Tuple2;
import org.apache.flink.configuration.ConfigOption;
import org.apache.flink.configuration.ConfigOptions;
import org.apache.flink.runtime.clusterframework.types.ResourceProfile;
import org.apache.flink.runtime.resourcemanager.autoscale.ResourceAutoScaler;
import org.apache.flink.runtime.resourcemanager.autoscale.plugins.ResourceDetector;
import org.apache.flink.runtime.resourcemanager.autoscale.plugins.ResourceSymptom;
import org.apache.flink.runtime.resourcemanager.autoscale.plugins.symptoms.ClusterHighBlockRequests;
import org.apache.flink.runtime.resourcemanager.autoscale.plugins.symptoms.ClusterZeroBlockRequests;
import org.apache.flink.runtime.resourcemanager.autoscale.utils.SlotManagerInfo;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.Collection;
/**
* ClusterBlockRequestDetector detects block request state of cluster.
* Detects {@link ClusterHighBlockRequests} if the number of new block requests
* is higher than threshold.
* Detects {@link ClusterZeroBlockRequests} if no new block requests.
*/
public class ClusterBlockRequestDetector implements ResourceDetector {
private static final Logger LOGGER = LoggerFactory.getLogger(ClusterBlockRequestDetector.class);
public static final ConfigOption HIGH_BLOCK_REQUEST_THRESHOLD =
ConfigOptions.key("session-auto-scale.cluster-block-request-detector.threashold.high").defaultValue(10L);
private ResourceAutoScaler resourceAutoScaler;
private double highThreshold;
private long lastBlockNum;
private long lastCheckTime;
private long nowBlockNum;
private long nowTime;
@Override
public void open(ResourceAutoScaler resourceAutoScaler) {
this.resourceAutoScaler = resourceAutoScaler;
this.highThreshold = resourceAutoScaler.getConfig().getLong(HIGH_BLOCK_REQUEST_THRESHOLD);
this.lastBlockNum = 0;
this.lastCheckTime = 0;
this.nowBlockNum = 0;
this.nowTime = 0;
}
@Override
public void close() {
}
@Override
public void update(SlotManagerInfo slotManagerInfo, Collection> taskManagersProfiles) {
nowBlockNum = slotManagerInfo.getBlockRequestsNumber();
nowTime = System.currentTimeMillis();
}
@Override
public ResourceSymptom detect() throws Exception {
LOGGER.debug("Start detecting");
LOGGER.debug("Cluster block requests {}.", nowBlockNum);
if (lastCheckTime != 0 && nowTime > lastCheckTime) {
long newBlockNum = nowBlockNum - lastBlockNum;
if (newBlockNum >= highThreshold) {
LOGGER.debug("Block requests number high detected for Cluster, new block {}, time gap {}",
newBlockNum, nowTime - lastCheckTime);
lastCheckTime = nowTime;
lastBlockNum = nowBlockNum;
return new ClusterHighBlockRequests(newBlockNum, nowTime - lastCheckTime);
} else if (newBlockNum == 0) {
LOGGER.debug("Block requests number zero detected for Cluster, new block {}, time gap {}",
newBlockNum, nowTime - lastCheckTime);
lastCheckTime = nowTime;
lastBlockNum = nowBlockNum;
return new ClusterZeroBlockRequests(nowTime - lastCheckTime);
} else if (newBlockNum < 0) {
LOGGER.error("New block request could not small than the previous level.");
}
}
lastCheckTime = nowTime;
lastBlockNum = nowBlockNum;
return null;
}
}