org.apache.flink.runtime.state.gemini.engine.handler.PageKListHandlerImpl Maven / Gradle / Ivy

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 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 org.apache.flink.runtime.state.gemini.engine.handler;

import org.apache.flink.api.java.tuple.Tuple2;
import org.apache.flink.core.memory.ByteArrayOutputStreamWithPos;
import org.apache.flink.core.memory.DataOutputViewStreamWrapper;
import org.apache.flink.runtime.state.gemini.engine.exceptions.GeminiRuntimeException;
import org.apache.flink.runtime.state.gemini.engine.hashtable.GRegionKListImpl;
import org.apache.flink.runtime.state.gemini.engine.memstore.GSValue;
import org.apache.flink.runtime.state.gemini.engine.memstore.GSValueList;
import org.apache.flink.runtime.state.gemini.engine.memstore.SegmentKListImpl;
import org.apache.flink.runtime.state.gemini.engine.page.PageIndex;
import org.apache.flink.runtime.state.gemini.engine.page.PageIndexContext;
import org.apache.flink.runtime.state.gemini.engine.page.PageSerdeFlink;
import org.apache.flink.runtime.state.gemini.engine.page.PageSerdeFlinkListImpl;
import org.apache.flink.runtime.state.gemini.engine.page.PageStoreKList;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;

/**
 * PageKListHandlerImpl.
 */
public class PageKListHandlerImpl extends AbstractRegionHandler implements PageHandler {

	private final SegmentKListImpl segment;
	private final GRegionKListImpl gRegion;
	private final PageStoreKList pageStore;
	private final boolean onlyEstimatedSize;

	public PageKListHandlerImpl(
		GRegionKListImpl gRegion, SegmentKListImpl segment, boolean onlyEstimatedSize) {
		super(gRegion.getGRegionContext());
		this.gRegion = gRegion;
		this.segment = segment;
		this.pageStore = gRegion.getPageStore();
		this.onlyEstimatedSize = onlyEstimatedSize;
	}

	@Override
	public void handle() {
		if (onlyEstimatedSize) {
			int keySize = estimateKeySize(this.segment);
			if (keySize > 0) {
				this.gRegion.getGRegionContext().getWriteBufferStats().setAverageKeyLen(keySize);
				this.gRegion.getGRegionContext().getWriteBufferStats().setAverageValueLen(estimateValueSize(this.segment));
			} else {
				//next time, run estimate handler again.
				this.gRegion.getGRegionContext().getWriteBufferStats().setAverageKeyLen(-2);
			}
			return;
		}
		PageIndex pageIndex = this.pageStore.getPageIndex();
		Map>>>>> organizedData = new HashMap<>();

		//step.1 divide records to different page.
		segment.getData().forEach((k, v) -> organizedData.computeIfAbsent(pageIndex.getPageIndexContext(k, true),
			(nothing) -> new ArrayList<>()).add(Tuple2.of(k, v)));

		//step.2 write page
		Iterator>>>>>> iterator = organizedData.entrySet().iterator();
		Set needSplitPageList = new HashSet<>();
		while (iterator.hasNext()) {
			Map.Entry>>>>> entry = iterator.next();
			if (entry.getKey().isNeedSplit()) {
				needSplitPageList.add(entry.getKey());
			}
			this.pageStore.addPage(entry.getKey(), entry.getValue(), segment.getVersion());
			//for fast gc.
			iterator.remove();
		}

		if (needSplitPageList.size() > 0) {
			needSplitPageList.stream().forEach(needSplitPage -> this.pageStore.splitPage(needSplitPage));
		}

		//if need, launch expand index handler.
		this.pageStore.checkResource();
	}

	private int estimateKeySize(SegmentKListImpl segment) {
		if (segment.getData() == null || segment.getData().isEmpty()) {
			return 0;
		}
		try {
			PageSerdeFlink pageSerdeFlink = this.gRegionContext.getPageSerdeFlink();
			ByteArrayOutputStreamWithPos outputStream = new ByteArrayOutputStreamWithPos();
			DataOutputViewStreamWrapper outputView = new DataOutputViewStreamWrapper(outputStream);
			for (K key : segment.getData().keySet()) {
				pageSerdeFlink.getKeySerde().serialize(key, outputView);
			}
			return outputStream.getPosition() / segment.getData().size();
		} catch (Exception e) {
			throw new GeminiRuntimeException("estimateKeySize has exception=" + e.getMessage(), e);
		}
	}

	private int estimateValueSize(SegmentKListImpl segment) {
		if (segment.getData() == null || segment.getData().isEmpty()) {
			return 0;
		}
		try {
			PageSerdeFlinkListImpl pageSerdeFlink = (PageSerdeFlinkListImpl) this.gRegionContext.getPageSerdeFlink();
			ByteArrayOutputStreamWithPos outputStream = new ByteArrayOutputStreamWithPos();
			DataOutputViewStreamWrapper outputView = new DataOutputViewStreamWrapper(outputStream);
			int totalCount = 0;
			for (GSValueList value : segment.getData().values()) {
				if (value.getValue() == null) {
					continue;
				}
				//estimate size of the element of this list.
				totalCount += value.getValue().size();
				pageSerdeFlink.getgListValueTypeSerializer().serialize(value.getValue(), outputView);
			}
			return totalCount == 0 ? 0 : (outputStream.getPosition() / totalCount) + 9;
		} catch (Exception e) {
			throw new GeminiRuntimeException("estimateValueSize has exception=" + e.getMessage(), e);
		}
	}

}