mychaow commented on a change in pull request #1464: URL: https://github.com/apache/incubator-iotdb/pull/1464#discussion_r450647146
########## File path: cluster/src/main/java/org/apache/iotdb/cluster/metadata/MetaPuller.java ########## @@ -0,0 +1,182 @@ +/* + * 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.iotdb.cluster.metadata; + +import org.apache.iotdb.cluster.client.async.AsyncDataClient; +import org.apache.iotdb.cluster.client.sync.SyncClientAdaptor; +import org.apache.iotdb.cluster.exception.CheckConsistencyException; +import org.apache.iotdb.cluster.partition.PartitionGroup; +import org.apache.iotdb.cluster.rpc.thrift.Node; +import org.apache.iotdb.cluster.rpc.thrift.PullSchemaRequest; +import org.apache.iotdb.cluster.server.member.MetaGroupMember; +import org.apache.iotdb.db.exception.metadata.MetadataException; +import org.apache.iotdb.db.exception.metadata.StorageGroupNotSetException; +import org.apache.iotdb.db.service.IoTDB; +import org.apache.iotdb.tsfile.write.schema.MeasurementSchema; +import org.apache.thrift.TException; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +import java.io.IOException; +import java.util.ArrayList; +import java.util.HashMap; +import java.util.List; +import java.util.Map; + +public class MetaPuller { + private static final Logger logger = LoggerFactory.getLogger(MetaPuller.class); + private MetaGroupMember metaGroupMember; + + private MetaPuller() { + } + + private static class MetaPullerHolder { + + private static final MetaPuller INSTANCE = new MetaPuller(); + } + + public void init(MetaGroupMember metaGroupMember) { + this.metaGroupMember = metaGroupMember; + } + + /** + * we should not use this function in other place, but only in IoTDB class + * @return + */ + public static MetaPuller getInstance() { + return MetaPullerHolder.INSTANCE; + } + + /** + * Pull the all timeseries schemas of given prefixPaths from remote nodes. All prefixPaths must + * contain the storage group. + */ + public List<MeasurementSchema> pullTimeSeriesSchemas(List<String> prefixPaths) + throws MetadataException { + logger.debug("{}: Pulling timeseries schemas of {}", metaGroupMember.getName(), prefixPaths); + // split the paths by the data groups that will hold them + Map<PartitionGroup, List<String>> partitionGroupPathMap = new HashMap<>(); + for (String prefixPath : prefixPaths) { + PartitionGroup partitionGroup; + try { + partitionGroup = metaGroupMember.getPartitionTable().partitionByPathTime(prefixPath, 0); + } catch (StorageGroupNotSetException e) { + // the storage group is not found locally, but may be found in the leader, retry after + // synchronizing with the leader + + try { + metaGroupMember.syncLeaderWithConsistencyCheck(); + } catch (CheckConsistencyException checkConsistencyException) { + throw new MetadataException(checkConsistencyException.getMessage()); + } + partitionGroup = metaGroupMember.getPartitionTable().partitionByPathTime(prefixPath, 0); + + } + partitionGroupPathMap.computeIfAbsent(partitionGroup, g -> new ArrayList<>()).add(prefixPath); + } + + List<MeasurementSchema> schemas = new ArrayList<>(); + // pull timeseries schema from every group involved + if (logger.isDebugEnabled()) { + logger.debug("{}: pulling schemas of {} and other {} paths from {} groups", metaGroupMember.getName(), + prefixPaths.get(0), prefixPaths.size() - 1, + partitionGroupPathMap.size()); + } + for (Map.Entry<PartitionGroup, List<String>> partitionGroupListEntry : partitionGroupPathMap + .entrySet()) { + PartitionGroup partitionGroup = partitionGroupListEntry.getKey(); + List<String> paths = partitionGroupListEntry.getValue(); + pullTimeSeriesSchemas(partitionGroup, paths, schemas); + } Review comment: It will be complicated, I will do it later ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: us...@infra.apache.org
