csun5285 commented on code in PR #27764: URL: https://github.com/apache/doris/pull/27764#discussion_r1413816188
########## fe/fe-core/src/main/java/org/apache/doris/common/util/FetchRemoteTabletSchemaUtil.java: ########## @@ -0,0 +1,334 @@ +// 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.doris.common.util; + +import org.apache.doris.catalog.AggregateType; +import org.apache.doris.catalog.ArrayType; +import org.apache.doris.catalog.Column; +import org.apache.doris.catalog.Env; +import org.apache.doris.catalog.MapType; +import org.apache.doris.catalog.Replica; +import org.apache.doris.catalog.StructType; +import org.apache.doris.catalog.Tablet; +import org.apache.doris.catalog.Type; +import org.apache.doris.common.AnalysisException; +import org.apache.doris.proto.InternalService.PFetchRemoteSchemaRequest; +import org.apache.doris.proto.InternalService.PFetchRemoteSchemaResponse; +import org.apache.doris.proto.InternalService.PTabletsLocation; +import org.apache.doris.proto.OlapFile.ColumnPB; +import org.apache.doris.proto.OlapFile.TabletSchemaPB; +import org.apache.doris.rpc.BackendServiceProxy; +import org.apache.doris.rpc.RpcException; +import org.apache.doris.system.Backend; +import org.apache.doris.thrift.TStatusCode; + +import com.google.common.base.Preconditions; +import com.google.common.collect.Lists; +import com.google.common.collect.Maps; +import com.google.common.collect.Sets; +import org.apache.logging.log4j.LogManager; +import org.apache.logging.log4j.Logger; + +import java.util.Collections; +import java.util.Comparator; +import java.util.List; +import java.util.Map; +import java.util.Set; +import java.util.concurrent.ExecutionException; +import java.util.concurrent.Future; +import java.util.concurrent.TimeUnit; +import java.util.concurrent.TimeoutException; + +// This class is used to pull the specified tablets' columns existing on the Backend (BE) +// including regular columns and columns decomposed by variants +public class FetchRemoteTabletSchemaUtil { + private static final Logger LOG = LogManager.getLogger(FetchRemoteTabletSchemaUtil.class); + + private List<Tablet> remoteTablets; + private List<Column> tableColumns; + + public FetchRemoteTabletSchemaUtil(List<Tablet> tablets) { + this.remoteTablets = tablets; + this.tableColumns = Lists.newArrayList(); + } + + public List<Column> fetch() { + // 1. Find which Backend (BE) servers the tablets are on + Preconditions.checkNotNull(remoteTablets); + Map<Long, Set<Long>> beIdToTabletId = Maps.newHashMap(); + for (Tablet tablet : remoteTablets) { + for (Replica replica : tablet.getReplicas()) { + // only need alive replica + if (replica.isAlive()) { + Set<Long> tabletIds = beIdToTabletId.computeIfAbsent( + replica.getBackendId(), k -> Sets.newHashSet()); + tabletIds.add(tablet.getId()); + } + } + } + + // 2. Randomly select 2 Backend (BE) servers to act as coordinators. + // Coordinator BE is responsible for collecting all table columns and returning to the FE. + // Two BE provide a retry opportunity with the second one in case the first attempt fails. + List<PTabletsLocation> locations = Lists.newArrayList(); + List<Backend> coordinatorBackend = Lists.newArrayList(); + for (Map.Entry<Long, Set<Long>> entry : beIdToTabletId.entrySet()) { + Long backendId = entry.getKey(); + Set<Long> tabletIds = entry.getValue(); + Backend backend = Env.getCurrentEnv().getCurrentSystemInfo().getBackend(backendId); + // only need alive be + if (!backend.isAlive()) { + continue; + } + // need 2 be to provide a retry + if (coordinatorBackend.size() < 2) { + coordinatorBackend.add(backend); + } + PTabletsLocation.Builder locationBuilder = PTabletsLocation.newBuilder() + .setHost(backend.getHost()) + .setBrpcPort(backend.getBrpcPort()); + PTabletsLocation location = locationBuilder.addAllTabletId(tabletIds).build(); + locations.add(location); + } + PFetchRemoteSchemaRequest.Builder requestBuilder = PFetchRemoteSchemaRequest.newBuilder() + .addAllTabletLocation(locations) + .setIsCoordinator(true); + // 3. Send rpc to coordinatorBackend util succeed or retry + for (Backend be : coordinatorBackend) { + try { + PFetchRemoteSchemaRequest request = requestBuilder.build(); + Future<PFetchRemoteSchemaResponse> future = BackendServiceProxy.getInstance() + .fetchRemoteTabletSchemaAsync(be.getBrpcAddress(), request); + PFetchRemoteSchemaResponse response = null; + try { + response = future.get(60, TimeUnit.SECONDS); + TStatusCode code = TStatusCode.findByValue(response.getStatus().getStatusCode()); + String errMsg; + if (code != TStatusCode.OK) { + if (!response.getStatus().getErrorMsgsList().isEmpty()) { + errMsg = response.getStatus().getErrorMsgsList().get(0); + } else { + errMsg = "fetchRemoteTabletSchemaAsync failed. backend address: " + + be.getHost() + " : " + be.getBrpcPort(); + } + throw new RpcException(be.getHost(), errMsg); + } + fillColumns(response); + return tableColumns; + } catch (AnalysisException e) { + // continue to get result + LOG.warn(e); + } catch (InterruptedException e) { + // continue to get result + LOG.warn("fetch remote schema future get interrupted Exception"); + } catch (TimeoutException e) { + future.cancel(true); + // continue to get result + LOG.warn("fetch remote schema result timeout, addr {}", be.getBrpcAddress()); + } + } catch (RpcException e) { + LOG.warn("fetch remote schema result rpc exception {}, e {}", be.getBrpcAddress(), e); + } catch (ExecutionException e) { + LOG.warn("fetch remote schema ExecutionException, addr {}, e {}", be.getBrpcAddress(), e); + } + } + return tableColumns; + } + + private void fillColumns(PFetchRemoteSchemaResponse response) throws AnalysisException { + TabletSchemaPB schemaPB = response.getMergedSchema(); + for (ColumnPB columnPB : schemaPB.getColumnList()) { + try { + Column remoteColumn = initColumnFromPB(columnPB); + tableColumns.add(remoteColumn); + } catch (Exception e) { + throw new AnalysisException("column default value to string failed"); + } + } + int variantColumntIdx = 0; + for (Column column : tableColumns) { + variantColumntIdx++; + if (column.getType().isVariantType()) { + break; + } + } + if (variantColumntIdx == tableColumns.size()) { + return; + } + List<Column> subList = tableColumns.subList(variantColumntIdx, tableColumns.size()); + Collections.sort(subList, new Comparator<Column>() { + @Override + public int compare(Column c1, Column c2) { + return c1.getName().compareTo(c2.getName()); + } + }); + } + + private Column initColumnFromPB(ColumnPB column) throws AnalysisException { + try { + AggregateType aggType = getAggTypeFromAggName(column.getAggregation()); + Type type = getTypeFromTypeName(column.getType()); + String columnName = column.getName(); + boolean isKey = column.getIsKey(); + boolean isNullable = column.getIsNullable(); + String defaultValue = column.getDefaultValue().toString("UTF-8"); + if (defaultValue.equals("")) { + defaultValue = null; + } + if (isKey) { + aggType = null; + } + do { + if (type.isArrayType()) { + List<ColumnPB> childColumn = column.getChildrenColumnsList(); + if (childColumn == null || childColumn.size() != 1) { + break; + } + Column child = initColumnFromPB(childColumn.get(0)); + type = new ArrayType(child.getType()); + } else if (type.isMapType()) { + List<ColumnPB> childColumn = column.getChildrenColumnsList(); + if (childColumn == null || childColumn.size() != 2) { + break; + } + Column keyChild = initColumnFromPB(childColumn.get(0)); + Column valueChild = initColumnFromPB(childColumn.get(1)); + type = new MapType(keyChild.getType(), valueChild.getType()); + } else if (type.isStructType()) { + List<ColumnPB> childColumn = column.getChildrenColumnsList(); + if (childColumn == null) { + break; + } + List<Type> childTypes = Lists.newArrayList(); + for (ColumnPB childPB : childColumn) { + childTypes.add(initColumnFromPB(childPB).getType()); + } + type = new StructType(childTypes); + } + } while (false); + return new Column(columnName, type, isKey, aggType, isNullable, + defaultValue, "remote schema"); + } catch (Exception e) { + throw new AnalysisException("default value to string failed"); + } + } + + private Type getTypeFromTypeName(String typeName) { Review Comment: done -- 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. To unsubscribe, e-mail: commits-unsubscr...@doris.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: commits-unsubscr...@doris.apache.org For additional commands, e-mail: commits-h...@doris.apache.org
