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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.metadata;
import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.Path;
import org.apache.hudi.avro.model.HoodieMetadataColumnStats;
import org.apache.hudi.common.bloom.BloomFilter;
import org.apache.hudi.common.config.HoodieMetadataConfig;
import org.apache.hudi.common.config.SerializableConfiguration;
import org.apache.hudi.common.data.HoodieData;
import org.apache.hudi.common.engine.HoodieEngineContext;
import org.apache.hudi.common.model.HoodieRecord;
import org.apache.hudi.common.table.HoodieTableMetaClient;
import org.apache.hudi.common.util.Option;
import org.apache.hudi.common.util.collection.Pair;
import org.apache.hudi.exception.HoodieMetadataException;
import java.io.IOException;
import java.io.Serializable;
import java.util.List;
import java.util.Map;
import static org.apache.hudi.common.util.ValidationUtils.checkArgument;
import static org.apache.hudi.common.util.ValidationUtils.checkState;
/**
* Interface that supports querying various pieces of metadata about a hudi table.
*/
public interface HoodieTableMetadata extends Serializable, AutoCloseable {
// Table name suffix
String METADATA_TABLE_NAME_SUFFIX = "_metadata";
/**
* Timestamp for a commit when the base dataset had not had any commits yet. this is < than even
* {@link org.apache.hudi.common.table.timeline.HoodieTimeline#INIT_INSTANT_TS}, such that the metadata table
* can be prepped even before bootstrap is done.
*/
String SOLO_COMMIT_TIMESTAMP = "00000000000000";
// Key for the record which saves list of all partitions
String RECORDKEY_PARTITION_LIST = "__all_partitions__";
// The partition name used for non-partitioned tables
String NON_PARTITIONED_NAME = ".";
String EMPTY_PARTITION_NAME = "";
/**
* Return the base-path of the Metadata Table for the given Dataset identified by base-path
*/
static String getMetadataTableBasePath(String dataTableBasePath) {
return dataTableBasePath + Path.SEPARATOR + HoodieTableMetaClient.METADATA_TABLE_FOLDER_PATH;
}
/**
* Returns the base path of the Dataset provided the base-path of the Metadata Table of this
* Dataset
*/
static String getDataTableBasePathFromMetadataTable(String metadataTableBasePath) {
checkArgument(isMetadataTable(metadataTableBasePath));
return metadataTableBasePath.substring(0, metadataTableBasePath.lastIndexOf(HoodieTableMetaClient.METADATA_TABLE_FOLDER_PATH) - 1);
}
/**
* Return the base path of the dataset.
*
* @param metadataTableBasePath The base path of the metadata table
*/
static String getDatasetBasePath(String metadataTableBasePath) {
int endPos = metadataTableBasePath.lastIndexOf(Path.SEPARATOR + HoodieTableMetaClient.METADATA_TABLE_FOLDER_PATH);
checkState(endPos != -1, metadataTableBasePath + " should be base path of the metadata table");
return metadataTableBasePath.substring(0, endPos);
}
/**
* Returns {@code True} if the given path contains a metadata table.
*
* @param basePath The base path to check
*/
static boolean isMetadataTable(String basePath) {
if (basePath.endsWith(Path.SEPARATOR)) {
basePath = basePath.substring(0, basePath.length() - 1);
}
return basePath.endsWith(HoodieTableMetaClient.METADATA_TABLE_FOLDER_PATH);
}
static HoodieTableMetadata create(HoodieEngineContext engineContext, HoodieMetadataConfig metadataConfig, String datasetBasePath,
String spillableMapPath) {
return create(engineContext, metadataConfig, datasetBasePath, spillableMapPath, false);
}
static HoodieTableMetadata create(HoodieEngineContext engineContext, HoodieMetadataConfig metadataConfig, String datasetBasePath,
String spillableMapPath, boolean reuse) {
if (metadataConfig.enabled()) {
return createHoodieBackedTableMetadata(engineContext, metadataConfig, datasetBasePath, spillableMapPath, reuse);
} else {
return createFSBackedTableMetadata(engineContext, metadataConfig, datasetBasePath);
}
}
static FileSystemBackedTableMetadata createFSBackedTableMetadata(HoodieEngineContext engineContext,
HoodieMetadataConfig metadataConfig,
String datasetBasePath) {
return new FileSystemBackedTableMetadata(engineContext, new SerializableConfiguration(engineContext.getHadoopConf()),
datasetBasePath, metadataConfig.shouldAssumeDatePartitioning());
}
static HoodieBackedTableMetadata createHoodieBackedTableMetadata(HoodieEngineContext engineContext,
HoodieMetadataConfig metadataConfig,
String datasetBasePath,
String spillableMapPath,
boolean reuse) {
return new HoodieBackedTableMetadata(engineContext, metadataConfig, datasetBasePath, spillableMapPath, reuse);
}
/**
* Fetch all the files at the given partition path, per the latest snapshot of the metadata.
*/
FileStatus[] getAllFilesInPartition(Path partitionPath) throws IOException;
/**
* Fetch list of all partition paths, per the latest snapshot of the metadata.
*/
List getAllPartitionPaths() throws IOException;
/**
* Fetch all files for given partition paths.
*/
Map getAllFilesInPartitions(List partitionPaths) throws IOException;
/**
* Get the bloom filter for the FileID from the metadata table.
*
* @param partitionName - Partition name
* @param fileName - File name for which bloom filter needs to be retrieved
* @return BloomFilter if available, otherwise empty
* @throws HoodieMetadataException
*/
Option getBloomFilter(final String partitionName, final String fileName)
throws HoodieMetadataException;
/**
* Get bloom filters for files from the metadata table index.
*
* @param partitionNameFileNameList - List of partition and file name pair for which bloom filters need to be retrieved
* @return Map of partition file name pair to its bloom filter
* @throws HoodieMetadataException
*/
Map, BloomFilter> getBloomFilters(final List> partitionNameFileNameList)
throws HoodieMetadataException;
/**
* Get column stats for files from the metadata table index.
*
* @param partitionNameFileNameList - List of partition and file name pair for which bloom filters need to be retrieved
* @param columnName - Column name for which stats are needed
* @return Map of partition and file name pair to its column stats
* @throws HoodieMetadataException
*/
Map, HoodieMetadataColumnStats> getColumnStats(final List> partitionNameFileNameList, final String columnName)
throws HoodieMetadataException;
/**
* Fetch records by key prefixes. Key prefix passed is expected to match the same prefix as stored in Metadata table partitions. For eg, in case of col stats partition,
* actual keys in metadata partition is encoded values of column name, partition name and file name. So, key prefixes passed to this method is expected to be encoded already.
*
* @param keyPrefixes list of key prefixes for which interested records are looked up for.
* @param partitionName partition name in metadata table where the records are looked up for.
* @return {@link HoodieData} of {@link HoodieRecord}s with records matching the passed in key prefixes.
*/
HoodieData> getRecordsByKeyPrefixes(List keyPrefixes,
String partitionName,
boolean shouldLoadInMemory);
/**
* Get the instant time to which the metadata is synced w.r.t data timeline.
*/
Option getSyncedInstantTime();
/**
* Returns the timestamp of the latest compaction.
*/
Option getLatestCompactionTime();
/**
* Clear the states of the table metadata.
*/
void reset();
}
