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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.drill.exec.store.dfs;
import java.util.Map;
import org.apache.drill.shaded.guava.com.google.common.collect.Maps;
import org.apache.hadoop.fs.Path;
/**
* A metadata context that holds state across multiple invocations of
* the Parquet metadata APIs.
*/
public class MetadataContext {
/**
* Map of directory path to the status of whether modification time was already checked.
* Note: the #directories is typically a small percentage of the #files, so the memory footprint
* is expected to be relatively small.
*/
private Map<Path, Boolean> dirModifCheckMap = Maps.newHashMap();
private PruneStatus pruneStatus = PruneStatus.NOT_STARTED;
private boolean metadataCacheCorrupted;
public void setStatus(Path dir) {
dirModifCheckMap.put(dir, true);
}
public void clearStatus(Path dir) {
dirModifCheckMap.put(dir, false);
}
public boolean getStatus(String dir) {
if (dirModifCheckMap.containsKey(dir)) {
return dirModifCheckMap.get(dir);
}
return false;
}
public void clear() {
dirModifCheckMap.clear();
metadataCacheCorrupted = false;
}
public void setPruneStatus(PruneStatus status) {
pruneStatus = status;
}
public PruneStatus getPruneStatus() {
return pruneStatus;
}
/**
* @return true if parquet metadata cache files are missing or corrupted, false otherwise
*/
public boolean isMetadataCacheCorrupted() {
return metadataCacheCorrupted;
}
/**
* Setting this as true allows to avoid double reading of corrupted, unsupported or missing metadata files
*
* @param metadataCacheCorrupted metadata corruption status
*/
public void setMetadataCacheCorrupted(boolean metadataCacheCorrupted) {
this.metadataCacheCorrupted = metadataCacheCorrupted;
}
public enum PruneStatus {
NOT_STARTED, // initial state
PRUNED, // partitions were pruned
NOT_PRUNED // partitions did not get pruned
}
}
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