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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.hudi;
import org.apache.hudi.common.config.HoodieMetadataConfig;
import org.apache.hudi.common.config.TypedProperties;
import org.apache.hudi.common.engine.HoodieEngineContext;
import org.apache.hudi.common.fs.FSUtils;
import org.apache.hudi.common.model.BaseFile;
import org.apache.hudi.common.model.FileSlice;
import org.apache.hudi.common.model.HoodieLogFile;
import org.apache.hudi.common.model.HoodieTableQueryType;
import org.apache.hudi.common.table.HoodieTableMetaClient;
import org.apache.hudi.common.table.timeline.HoodieInstant;
import org.apache.hudi.common.table.timeline.HoodieTimeline;
import org.apache.hudi.common.table.view.HoodieTableFileSystemView;
import org.apache.hudi.common.util.CollectionUtils;
import org.apache.hudi.common.util.HoodieTimer;
import org.apache.hudi.common.util.Option;
import org.apache.hudi.common.util.collection.Pair;
import org.apache.hudi.exception.HoodieException;
import org.apache.hudi.exception.HoodieIOException;
import org.apache.hudi.expression.Expression;
import org.apache.hudi.hadoop.CachingPath;
import org.apache.hudi.internal.schema.Types;
import org.apache.hudi.metadata.HoodieTableMetadata;
import org.apache.hudi.metadata.HoodieTableMetadataUtil;
import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.Path;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.IOException;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.Set;
import java.util.function.Function;
import java.util.stream.Collectors;
import static org.apache.hudi.common.config.HoodieMetadataConfig.DEFAULT_METADATA_ENABLE_FOR_READERS;
import static org.apache.hudi.common.config.HoodieMetadataConfig.ENABLE;
import static org.apache.hudi.common.table.timeline.TimelineUtils.validateTimestampAsOf;
import static org.apache.hudi.common.util.CollectionUtils.combine;
import static org.apache.hudi.hadoop.CachingPath.createRelativePathUnsafe;
/**
* Common (engine-agnostic) File Index implementation enabling individual query engines to
* list Hudi Table contents based on the
*
*
*
Table type (MOR, COW)
*
Query type (snapshot, read_optimized, incremental)
*
Query instant/range
*
*/
public abstract class BaseHoodieTableFileIndex implements AutoCloseable {
private static final Logger LOG = LoggerFactory.getLogger(BaseHoodieTableFileIndex.class);
private final String[] partitionColumns;
protected final HoodieMetadataConfig metadataConfig;
private final Option specifiedQueryInstant;
private final List queryPaths;
private final boolean shouldIncludePendingCommits;
private final boolean shouldValidateInstant;
// The `shouldListLazily` variable controls how we initialize/refresh the TableFileIndex:
// - non-lazy/eager listing (shouldListLazily=false): all partitions and file slices will be loaded eagerly during initialization.
// - lazy listing (shouldListLazily=true): partitions listing will be done lazily with the knowledge from query predicate on partition
// columns. And file slices fetching only happens for partitions satisfying the given filter.
//
// In SparkSQL, `shouldListLazily` is controlled by option `REFRESH_PARTITION_AND_FILES_IN_INITIALIZATION`.
// In lazy listing case, if no predicate on partition is provided, all partitions will still be loaded.
private final boolean shouldListLazily;
private final Path basePath;
private final HoodieTableMetaClient metaClient;
private final HoodieEngineContext engineContext;
private final transient FileStatusCache fileStatusCache;
// NOTE: Individual partitions are always cached in full: meaning that if partition is cached
// it will hold all the file-slices residing w/in the partition
private transient volatile Map> cachedAllInputFileSlices = new HashMap<>();
// NOTE: It always contains either all partition paths, or null if it is not initialized yet
private transient volatile List cachedAllPartitionPaths = null;
private transient HoodieTableMetadata tableMetadata = null;
/**
* @param engineContext Hudi engine-specific context
* @param metaClient Hudi table's meta-client
* @param configProperties unifying configuration (in the form of generic properties)
* @param queryType target query type
* @param queryPaths target DFS paths being queried
* @param specifiedQueryInstant instant as of which table is being queried
* @param shouldIncludePendingCommits flags whether file-index should exclude any pending operations
* @param shouldValidateInstant flags to validate whether query instant is present in the timeline
* @param fileStatusCache transient cache of fetched [[FileStatus]]es
*/
public BaseHoodieTableFileIndex(HoodieEngineContext engineContext,
HoodieTableMetaClient metaClient,
TypedProperties configProperties,
HoodieTableQueryType queryType,
List queryPaths,
Option specifiedQueryInstant,
boolean shouldIncludePendingCommits,
boolean shouldValidateInstant,
FileStatusCache fileStatusCache,
boolean shouldListLazily) {
this.partitionColumns = metaClient.getTableConfig().getPartitionFields()
.orElse(new String[0]);
this.metadataConfig = HoodieMetadataConfig.newBuilder()
.fromProperties(configProperties)
.enable(configProperties.getBoolean(ENABLE.key(), DEFAULT_METADATA_ENABLE_FOR_READERS)
&& HoodieTableMetadataUtil.isFilesPartitionAvailable(metaClient))
.build();
this.queryPaths = queryPaths;
this.specifiedQueryInstant = specifiedQueryInstant;
this.shouldIncludePendingCommits = shouldIncludePendingCommits;
this.shouldValidateInstant = shouldValidateInstant;
this.shouldListLazily = shouldListLazily;
this.basePath = metaClient.getBasePathV2();
this.metaClient = metaClient;
this.engineContext = engineContext;
this.fileStatusCache = fileStatusCache;
doRefresh();
}
protected abstract Object[] doParsePartitionColumnValues(String[] partitionColumns, String partitionPath);
/**
* Returns latest completed instant as seen by this instance of the file-index
*/
public Option getLatestCompletedInstant() {
return getActiveTimeline().filterCompletedInstants().lastInstant();
}
/**
* Returns table's base-path
*/
public Path getBasePath() {
return basePath;
}
public int getFileSlicesCount() {
return getAllInputFileSlices().values().stream()
.mapToInt(List::size).sum();
}
@Override
public void close() throws Exception {
resetTableMetadata(null);
}
protected String[] getPartitionColumns() {
return partitionColumns;
}
protected List getQueryPaths() {
return queryPaths;
}
/**
* Returns all partition paths matching the ones explicitly provided by the query (if any)
*/
protected List getAllQueryPartitionPaths() {
if (cachedAllPartitionPaths == null) {
List queryRelativePartitionPaths = queryPaths.stream()
.map(path -> FSUtils.getRelativePartitionPath(basePath, path))
.collect(Collectors.toList());
this.cachedAllPartitionPaths = listPartitionPaths(queryRelativePartitionPaths);
}
return cachedAllPartitionPaths;
}
/**
* Returns all listed file-slices w/in the partition paths returned by {@link #getAllQueryPartitionPaths()}
*/
protected Map> getAllInputFileSlices() {
if (!areAllFileSlicesCached()) {
ensurePreloadedPartitions(getAllQueryPartitionPaths());
}
return cachedAllInputFileSlices;
}
/**
* Get input file slice for the given partition. Will use cache directly if it is computed before.
*/
protected Map> getInputFileSlices(PartitionPath... partitions) {
ensurePreloadedPartitions(Arrays.asList(partitions));
return Arrays.stream(partitions).collect(
Collectors.toMap(Function.identity(), partition -> cachedAllInputFileSlices.get(partition))
);
}
private void ensurePreloadedPartitions(List partitionPaths) {
// Fetching file slices for partitions that have not been cached yet
List missingPartitions = partitionPaths.stream()
.filter(p -> !cachedAllInputFileSlices.containsKey(p))
.collect(Collectors.toList());
// NOTE: Individual partitions are always cached in full, therefore if partition is cached
// it will hold all the file-slices residing w/in the partition
cachedAllInputFileSlices.putAll(loadFileSlicesForPartitions(missingPartitions));
}
private Map> loadFileSlicesForPartitions(List partitions) {
if (partitions.isEmpty()) {
return Collections.emptyMap();
}
if (specifiedQueryInstant.isPresent() && !shouldIncludePendingCommits) {
validateTimestampAsOf(metaClient, specifiedQueryInstant.get());
}
FileStatus[] allFiles = listPartitionPathFiles(partitions);
HoodieTimeline activeTimeline = getActiveTimeline();
Option latestInstant = activeTimeline.lastInstant();
HoodieTableFileSystemView fileSystemView =
new HoodieTableFileSystemView(metaClient, activeTimeline, allFiles);
Option queryInstant = specifiedQueryInstant.or(() -> latestInstant.map(HoodieInstant::getTimestamp));
validate(activeTimeline, queryInstant);
// NOTE: For MOR table, when the compaction is inflight, we need to not only fetch the
// latest slices, but also include the base and log files of the second-last version of
// the file slice in the same file group as the latest file slice that is under compaction.
// This logic is realized by `AbstractTableFileSystemView::getLatestMergedFileSlicesBeforeOrOn`
// API. Note that for COW table, the merging logic of two slices does not happen as there
// is no compaction, thus there is no performance impact.
return partitions.stream().collect(
Collectors.toMap(
Function.identity(),
partitionPath ->
queryInstant.map(instant ->
fileSystemView.getLatestMergedFileSlicesBeforeOrOn(partitionPath.path, queryInstant.get())
)
.orElse(fileSystemView.getLatestFileSlices(partitionPath.path))
.collect(Collectors.toList())
));
}
protected List listPartitionPaths(List relativePartitionPaths,
Types.RecordType partitionFields,
Expression partitionColumnPredicates) {
List matchedPartitionPaths;
try {
matchedPartitionPaths = tableMetadata.getPartitionPathWithPathPrefixUsingFilterExpression(relativePartitionPaths,
partitionFields, partitionColumnPredicates);
} catch (IOException e) {
throw new HoodieIOException("Error fetching partition paths", e);
}
// Convert partition's path into partition descriptor
return matchedPartitionPaths.stream()
.map(partitionPath -> {
Object[] partitionColumnValues = parsePartitionColumnValues(partitionColumns, partitionPath);
return new PartitionPath(partitionPath, partitionColumnValues);
})
.collect(Collectors.toList());
}
protected List listPartitionPaths(List relativePartitionPaths) {
List matchedPartitionPaths;
try {
matchedPartitionPaths = tableMetadata.getPartitionPathWithPathPrefixes(relativePartitionPaths);
} catch (IOException e) {
throw new HoodieIOException("Error fetching partition paths", e);
}
// Convert partition's path into partition descriptor
return matchedPartitionPaths.stream()
.map(partitionPath -> {
Object[] partitionColumnValues = parsePartitionColumnValues(partitionColumns, partitionPath);
return new PartitionPath(partitionPath, partitionColumnValues);
})
.collect(Collectors.toList());
}
protected void refresh() {
fileStatusCache.invalidate();
doRefresh();
}
protected HoodieTimeline getActiveTimeline() {
// NOTE: We have to use commits and compactions timeline, to make sure that we're properly
// handling the following case: when records are inserted into the new log-file w/in the file-group
// that is under the pending compaction process, new log-file will bear the compaction's instant (on the
// timeline) in its name, as opposed to the base-file's commit instant. To make sure we're not filtering
// such log-file we have to _always_ include pending compaction instants into consideration
// TODO(HUDI-3302) re-evaluate whether we should filter any commits in here
HoodieTimeline timeline = metaClient.getCommitsAndCompactionTimeline();
if (shouldIncludePendingCommits) {
return timeline;
} else {
return timeline.filterCompletedAndCompactionInstants();
}
}
private Object[] parsePartitionColumnValues(String[] partitionColumns, String partitionPath) {
Object[] partitionColumnValues = doParsePartitionColumnValues(partitionColumns, partitionPath);
if (shouldListLazily && partitionColumnValues.length != partitionColumns.length) {
throw new HoodieException("Failed to parse partition column values from the partition-path:"
+ " likely non-encoded slashes being used in partition column's values. You can try to"
+ " work this around by switching listing mode to eager");
}
return partitionColumnValues;
}
/**
* Load partition paths and it's files under the query table path.
*/
private FileStatus[] listPartitionPathFiles(List partitions) {
List partitionPaths = partitions.stream()
// NOTE: We're using [[createPathUnsafe]] to create Hadoop's [[Path]] objects
// instances more efficiently, provided that
// - We're using already normalized relative paths
// - Its scope limited to [[FileStatusCache]]
.map(partition -> createRelativePathUnsafe(partition.path))
.collect(Collectors.toList());
// Lookup in cache first
Map cachedPartitionPaths =
partitionPaths.parallelStream()
.map(partitionPath -> Pair.of(partitionPath, fileStatusCache.get(partitionPath)))
.filter(partitionPathFilesPair -> partitionPathFilesPair.getRight().isPresent())
.collect(Collectors.toMap(Pair::getKey, p -> p.getRight().get()));
Set missingPartitionPaths =
CollectionUtils.diffSet(partitionPaths, cachedPartitionPaths.keySet());
// NOTE: We're constructing a mapping of absolute form of the partition-path into
// its relative one, such that we don't need to reconstruct these again later on
Map missingPartitionPathsMap = missingPartitionPaths.stream()
.collect(Collectors.toMap(
relativePartitionPath -> new CachingPath(basePath, relativePartitionPath).toString(),
Function.identity()
));
try {
Map fetchedPartitionsMap =
tableMetadata.getAllFilesInPartitions(missingPartitionPathsMap.keySet());
// Ingest newly fetched partitions into cache
fetchedPartitionsMap.forEach((absolutePath, files) -> {
Path relativePath = missingPartitionPathsMap.get(absolutePath);
fileStatusCache.put(relativePath, files);
});
return combine(flatMap(cachedPartitionPaths.values()),
flatMap(fetchedPartitionsMap.values()));
} catch (IOException e) {
throw new HoodieIOException("Failed to list partition paths", e);
}
}
private void doRefresh() {
HoodieTimer timer = HoodieTimer.start();
resetTableMetadata(createMetadataTable(engineContext, metadataConfig, basePath));
// Make sure we reload active timeline
metaClient.reloadActiveTimeline();
// Reset it to null to trigger re-loading of all partition path
this.cachedAllPartitionPaths = null;
if (!shouldListLazily) {
ensurePreloadedPartitions(getAllQueryPartitionPaths());
}
LOG.info(String.format("Refresh table %s, spent: %d ms", metaClient.getTableConfig().getTableName(), timer.endTimer()));
}
private void validate(HoodieTimeline activeTimeline, Option queryInstant) {
if (shouldValidateInstant) {
if (queryInstant.isPresent() && !activeTimeline.containsInstant(queryInstant.get())) {
throw new HoodieIOException(String.format("Query instant (%s) not found in the timeline", queryInstant.get()));
}
}
}
private boolean canParsePartitionValues() {
// If we failed to parse partition-values from the partition-path partition value will be
// represented as {@code InternalRow.empty}. In that case we try to recourse to query table
// as a non-partitioned one instead of failing
//
// NOTE: In case of lazy listing, we can't validate upfront whether we'd be able to parse
// partition-values and such fallback unfortunately won't be functional.
// This method has to return stable response once corresponding file index is initialized,
// and can't change its value afterwards
return shouldListLazily || cachedAllPartitionPaths.stream().allMatch(p -> p.values.length > 0);
}
protected long getTotalCachedFilesSize() {
return cachedAllInputFileSlices.values().stream()
.flatMap(Collection::stream)
.mapToLong(BaseHoodieTableFileIndex::fileSliceSize)
.sum();
}
protected boolean areAllFileSlicesCached() {
// Loop over partition paths to check if all partitions are initialized.
return areAllPartitionPathsCached()
&& cachedAllPartitionPaths.stream().allMatch(p -> cachedAllInputFileSlices.containsKey(p));
}
protected boolean areAllPartitionPathsCached() {
// If the partition paths is not fully initialized yet, then the file slices are also not fully initialized.
return cachedAllPartitionPaths != null;
}
protected boolean shouldReadAsPartitionedTable() {
return (partitionColumns.length > 0 && canParsePartitionValues()) || HoodieTableMetadata.isMetadataTable(basePath.toString());
}
private static long fileSliceSize(FileSlice fileSlice) {
long logFileSize = fileSlice.getLogFiles().map(HoodieLogFile::getFileSize)
.filter(s -> s > 0)
.reduce(0L, Long::sum);
return fileSlice.getBaseFile().map(BaseFile::getFileLen).orElse(0L) + logFileSize;
}
private void resetTableMetadata(HoodieTableMetadata newTableMetadata) {
if (tableMetadata != null) {
try {
tableMetadata.close();
} catch (Exception e) {
throw new HoodieException("Failed to close HoodieTableMetadata instance", e);
}
}
tableMetadata = newTableMetadata;
}
private static HoodieTableMetadata createMetadataTable(
HoodieEngineContext engineContext,
HoodieMetadataConfig metadataConfig,
Path basePath
) {
HoodieTableMetadata newTableMetadata = HoodieTableMetadata.create(engineContext, metadataConfig, basePath.toString(), true);
return newTableMetadata;
}
private static FileStatus[] flatMap(Collection arrays) {
return arrays.stream().flatMap(Arrays::stream).toArray(FileStatus[]::new);
}
/**
* Partition path information containing the relative partition path
* and values of partition columns.
*/
public static final class PartitionPath {
final String path;
final Object[] values;
public PartitionPath(String path, Object[] values) {
this.path = path;
this.values = values;
}
public String getPath() {
return path;
}
@Override
public boolean equals(Object other) {
return other instanceof PartitionPath
&& Objects.equals(path, ((PartitionPath) other).path)
&& Arrays.equals(values, ((PartitionPath) other).values);
}
@Override
public int hashCode() {
return path.hashCode() * 1103 + Arrays.hashCode(values);
}
}
/**
* APIs for caching {@link FileStatus}.
*/
protected interface FileStatusCache {
Option get(Path path);
void put(Path path, FileStatus[] leafFiles);
void invalidate();
}
}
