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presto-hive/src/main/java/com/facebook/presto/hive/HiveFileRenamer.java
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| /* | ||
| * Licensed 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 com.facebook.presto.hive; | ||
|
|
||
| import com.facebook.presto.spi.ConnectorMetadataUpdateHandle; | ||
| import com.facebook.presto.spi.QueryId; | ||
| import com.facebook.presto.spi.SchemaTableName; | ||
| import com.google.common.collect.ImmutableList; | ||
| import org.weakref.jmx.Managed; | ||
|
|
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| import javax.annotation.PreDestroy; | ||
|
|
||
| import java.util.List; | ||
| import java.util.Map; | ||
| import java.util.Objects; | ||
| import java.util.Optional; | ||
| import java.util.concurrent.ConcurrentHashMap; | ||
| import java.util.concurrent.atomic.AtomicLong; | ||
|
|
||
| import static com.google.common.base.Verify.verify; | ||
|
|
||
| public class HiveFileRenamer | ||
| { | ||
| private final Map<QueryId, Map<HiveMetadataUpdateKey, AtomicLong>> queryPartitionFileCounterMap = new ConcurrentHashMap<>(); | ||
| private final Map<QueryId, Map<HiveMetadataUpdateHandle, String>> queryHiveMetadataResultMap = new ConcurrentHashMap<>(); | ||
|
|
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| public List<ConnectorMetadataUpdateHandle> getMetadataUpdateResults(List<ConnectorMetadataUpdateHandle> metadataUpdateRequests, QueryId queryId) | ||
| { | ||
| ImmutableList.Builder<ConnectorMetadataUpdateHandle> metadataUpdateResults = ImmutableList.builder(); | ||
|
|
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| for (ConnectorMetadataUpdateHandle connectorMetadataUpdateHandle : metadataUpdateRequests) { | ||
| HiveMetadataUpdateHandle request = (HiveMetadataUpdateHandle) connectorMetadataUpdateHandle; | ||
| String fileName = getFileName(request, queryId); | ||
| metadataUpdateResults.add(new HiveMetadataUpdateHandle(request.getRequestId(), request.getSchemaTableName(), request.getPartitionName(), Optional.of(fileName))); | ||
| } | ||
| return metadataUpdateResults.build(); | ||
| } | ||
|
|
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| public void cleanup(QueryId queryId) | ||
| { | ||
| queryPartitionFileCounterMap.remove(queryId); | ||
| queryHiveMetadataResultMap.remove(queryId); | ||
| } | ||
|
|
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| private String getFileName(HiveMetadataUpdateHandle request, QueryId queryId) | ||
| { | ||
| if (!queryPartitionFileCounterMap.containsKey(queryId) || !queryHiveMetadataResultMap.containsKey(queryId)) { | ||
| queryPartitionFileCounterMap.putIfAbsent(queryId, new ConcurrentHashMap<>()); | ||
| queryHiveMetadataResultMap.putIfAbsent(queryId, new ConcurrentHashMap<>()); | ||
| } | ||
|
|
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| // To keep track of the file counter per query per partition | ||
| Map<HiveMetadataUpdateKey, AtomicLong> partitionFileCounterMap = queryPartitionFileCounterMap.get(queryId); | ||
|
|
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| // To keep track of the file name result per query per request | ||
| // This is to make sure that request - fileName mapping is 1:1 | ||
| Map<HiveMetadataUpdateHandle, String> hiveMetadataResultMap = queryHiveMetadataResultMap.get(queryId); | ||
|
|
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| // If we have seen this request before then directly return the result. | ||
| if (hiveMetadataResultMap.containsKey(request)) { | ||
| // We come here if for some reason the worker did not receive the fileName and it retried the request. | ||
| return hiveMetadataResultMap.get(request); | ||
| } | ||
|
|
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| HiveMetadataUpdateKey key = new HiveMetadataUpdateKey(request); | ||
| // File names start from 0 | ||
| partitionFileCounterMap.putIfAbsent(key, new AtomicLong(0)); | ||
|
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| AtomicLong fileCount = partitionFileCounterMap.get(key); | ||
| String fileName = Long.valueOf(fileCount.getAndIncrement()).toString(); | ||
|
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| // Store the request - fileName mapping | ||
| hiveMetadataResultMap.put(request, fileName); | ||
|
|
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| return fileName; | ||
| } | ||
|
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| @PreDestroy | ||
| public void stop() | ||
| { | ||
| // Mappings should be deleted when query finishes. So verify that map is empty before its closed. | ||
| verify(queryPartitionFileCounterMap.isEmpty(), "Query partition file counter map has %s entries left behind", queryPartitionFileCounterMap.size()); | ||
| verify(queryHiveMetadataResultMap.isEmpty(), "Query hive metadata result map has %s entries left behind", queryHiveMetadataResultMap.size()); | ||
| } | ||
|
|
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| @Managed | ||
| public int getQueryPartitionFileCounterMapSize() | ||
| { | ||
| return queryPartitionFileCounterMap.size(); | ||
| } | ||
|
|
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| @Managed | ||
| public int getHiveMetadataUpdateResultMapSize() | ||
| { | ||
| return queryHiveMetadataResultMap.size(); | ||
| } | ||
|
|
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| private static class HiveMetadataUpdateKey | ||
| { | ||
| private final SchemaTableName schemaTableName; | ||
| private final Optional<String> partitionName; | ||
|
|
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| private HiveMetadataUpdateKey(HiveMetadataUpdateHandle hiveMetadataUpdateHandle) | ||
| { | ||
| this.schemaTableName = hiveMetadataUpdateHandle.getSchemaTableName(); | ||
| this.partitionName = hiveMetadataUpdateHandle.getPartitionName(); | ||
| } | ||
|
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||
| @Override | ||
| public boolean equals(Object obj) | ||
| { | ||
| if (this == obj) { | ||
| return true; | ||
| } | ||
| if (obj == null || getClass() != obj.getClass()) { | ||
| return false; | ||
| } | ||
| HiveMetadataUpdateKey o = (HiveMetadataUpdateKey) obj; | ||
| return schemaTableName.equals(o.schemaTableName) && | ||
| partitionName.equals(o.partitionName); | ||
| } | ||
|
|
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| @Override | ||
| public int hashCode() | ||
| { | ||
| return Objects.hash(schemaTableName, partitionName); | ||
| } | ||
| } | ||
| } |
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