57 lines
1.9 KiB
Java
57 lines
1.9 KiB
Java
/*
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* Copyright (c) 2016 Uber Technologies, Inc. (hoodie-dev-group@uber.com)
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.uber.hoodie.hive;
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import com.uber.hoodie.hive.client.HoodieFSClient;
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import com.uber.hoodie.hive.model.HoodieDatasetReference;
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import org.apache.hadoop.fs.FileStatus;
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import org.apache.hadoop.fs.Path;
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/**
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* Abstraction to define HDFS partition strategies.
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* Strategy provides hookups to map partitions on to physical layout
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*
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* @see SchemaStrategy
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*/
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public interface PartitionStrategy {
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/**
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* Scans the file system for all partitions and returns FileStatus[] which are the available partitions
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*
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* @param basePath
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* @param fsClient
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* @return
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*/
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FileStatus[] scanAllPartitions(HoodieDatasetReference basePath, HoodieFSClient fsClient);
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/**
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* Get the list of hive field names the dataset will be partitioned on.
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* The field name should be present in the storage schema.
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*
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* @return List of partitions field names
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*/
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String[] getHivePartitionFieldNames();
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/**
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* Convert a Partition path (returned in scanAllPartitions) to values for column names returned in getHivePartitionFieldNames
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* e.g. /data/topic/2016/12/12/ will return [2016, 12, 12]
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*
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* @param partition storage path
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* @return List of partitions field values
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*/
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String[] convertPartitionToValues(HoodieDatasetReference metadata, Path partition);
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}
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