jon-wei commented on a change in pull request #6094: Introduce SystemSchema tables (#5989) URL: https://github.com/apache/incubator-druid/pull/6094#discussion_r220019360
########## File path: sql/src/main/java/io/druid/sql/calcite/schema/SystemSchema.java ########## @@ -0,0 +1,537 @@ +/* + * 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 io.druid.sql.calcite.schema; + +import com.fasterxml.jackson.core.JsonProcessingException; +import com.fasterxml.jackson.core.type.TypeReference; +import com.fasterxml.jackson.databind.ObjectMapper; +import com.google.common.base.Preconditions; +import com.google.common.collect.FluentIterable; +import com.google.common.collect.ImmutableMap; +import com.google.inject.Inject; +import io.druid.client.DruidServer; +import io.druid.client.ImmutableDruidDataSource; +import io.druid.client.TimelineServerView; +import io.druid.client.coordinator.Coordinator; +import io.druid.client.indexing.IndexingService; +import io.druid.client.selector.QueryableDruidServer; +import io.druid.discovery.DruidLeaderClient; +import io.druid.indexer.TaskStatusPlus; +import io.druid.java.util.common.ISE; +import io.druid.java.util.common.StringUtils; +import io.druid.java.util.common.logger.Logger; +import io.druid.java.util.http.client.response.FullResponseHolder; +import io.druid.segment.column.ValueType; +import io.druid.server.coordination.ServerType; +import io.druid.server.security.AuthorizerMapper; +import io.druid.sql.calcite.table.RowSignature; +import io.druid.timeline.DataSegment; +import org.apache.calcite.DataContext; +import org.apache.calcite.linq4j.Enumerable; +import org.apache.calcite.linq4j.Linq4j; +import org.apache.calcite.rel.type.RelDataType; +import org.apache.calcite.rel.type.RelDataTypeFactory; +import org.apache.calcite.schema.ScannableTable; +import org.apache.calcite.schema.Table; +import org.apache.calcite.schema.impl.AbstractSchema; +import org.apache.calcite.schema.impl.AbstractTable; +import org.jboss.netty.handler.codec.http.HttpMethod; +import org.jboss.netty.handler.codec.http.HttpResponseStatus; +import org.joda.time.DateTime; + +import java.io.IOException; +import java.util.ArrayList; +import java.util.HashMap; +import java.util.List; +import java.util.Map; +import java.util.function.Function; +import java.util.stream.Collectors; + +public class SystemSchema extends AbstractSchema +{ + private static final Logger log = new Logger(SystemSchema.class); + + public static final String NAME = "sys"; + private static final String SEGMENTS_TABLE = "segments"; + private static final String SERVERS_TABLE = "servers"; + private static final String SEGMENT_SERVERS_TABLE = "segment_servers"; + private static final String TASKS_TABLE = "tasks"; + private static final int SEGMENTS_TABLE_SIZE; + private static final int SEGMENT_SERVERS_TABLE_SIZE; + + private static final RowSignature SEGMENTS_SIGNATURE = RowSignature + .builder() + .add("segment_id", ValueType.STRING) + .add("datasource", ValueType.STRING) + .add("start", ValueType.STRING) + .add("end", ValueType.STRING) + .add("size", ValueType.LONG) + .add("version", ValueType.STRING) + .add("partition_num", ValueType.STRING) + .add("num_replicas", ValueType.LONG) + .add("is_published", ValueType.LONG) + .add("is_available", ValueType.LONG) + .add("is_realtime", ValueType.LONG) + .add("payload", ValueType.STRING) + .build(); + + private static final RowSignature SERVERS_SIGNATURE = RowSignature + .builder() + .add("server", ValueType.STRING) + .add("scheme", ValueType.STRING) + .add("server_type", ValueType.STRING) + .add("tier", ValueType.STRING) + .add("curr_size", ValueType.LONG) + .add("max_size", ValueType.LONG) + .build(); + + private static final RowSignature SERVERSEGMENTS_SIGNATURE = RowSignature + .builder() + .add("server", ValueType.STRING) + .add("segment_id", ValueType.STRING) + .build(); + + private static final RowSignature TASKS_SIGNATURE = RowSignature + .builder() + .add("task_id", ValueType.STRING) + .add("type", ValueType.STRING) + .add("datasource", ValueType.STRING) + .add("created_time", ValueType.STRING) + .add("queue_insertion_time", ValueType.STRING) + .add("status", ValueType.STRING) + .add("runner_status", ValueType.STRING) + .add("duration", ValueType.STRING) + .add("location", ValueType.STRING) + .add("error_msg", ValueType.STRING) + .build(); + + private final Map<String, Table> tableMap; + + static { + SEGMENTS_TABLE_SIZE = SEGMENTS_SIGNATURE.getRowOrder().size(); + SEGMENT_SERVERS_TABLE_SIZE = SERVERSEGMENTS_SIGNATURE.getRowOrder().size(); + } + + @Inject + public SystemSchema( + final TimelineServerView serverView, + final AuthorizerMapper authorizerMapper, + final @Coordinator DruidLeaderClient coordinatorDruidLeaderClient, + final @IndexingService DruidLeaderClient overlordDruidLeaderClient, + final ObjectMapper jsonMapper + ) + { + Preconditions.checkNotNull(serverView, "serverView"); + this.tableMap = ImmutableMap.of( + SEGMENTS_TABLE, new SegmentsTable(serverView, coordinatorDruidLeaderClient, jsonMapper), + SERVERS_TABLE, new ServersTable(serverView), + SEGMENT_SERVERS_TABLE, new ServerSegmentsTable(serverView), + TASKS_TABLE, new TasksTable(overlordDruidLeaderClient, jsonMapper) + ); + } + + @Override + public Map<String, Table> getTableMap() + { + return tableMap; + } + + static class SegmentsTable extends AbstractTable implements ScannableTable + { + private final TimelineServerView serverView; + private final DruidLeaderClient druidLeaderClient; + private final ObjectMapper jsonMapper; + + public SegmentsTable( + TimelineServerView serverView, + DruidLeaderClient druidLeaderClient, + ObjectMapper jsonMapper + ) + { + this.serverView = serverView; + this.druidLeaderClient = druidLeaderClient; + this.jsonMapper = jsonMapper; + } + + @Override + public RelDataType getRowType(RelDataTypeFactory typeFactory) + { + return SEGMENTS_SIGNATURE.getRelDataType(typeFactory); + } + + @Override + public TableType getJdbcTableType() + { + return TableType.SYSTEM_TABLE; + } + + @Override + public Enumerable<Object[]> scan(DataContext root) + { + final List<Object[]> rows = new ArrayList<>(); + final List<ImmutableDruidDataSource> druidDataSourceList = getMetadataSegments(druidLeaderClient, jsonMapper); + final List<DataSegment> metadataSegments = druidDataSourceList + .stream() + .flatMap(t -> t.getSegments().stream()) + .collect(Collectors.toList()); + final Map<String, DataSegment> publishedSegments = metadataSegments + .stream() + .collect(Collectors.toMap( + DataSegment::getIdentifier, + Function.identity() + )); + final Map<String, DataSegment> availableSegments = new HashMap<>(); + final Map<String, QueryableDruidServer> serverViewClients = serverView.getClients(); + for (QueryableDruidServer queryableDruidServer : serverViewClients.values()) { + final DruidServer druidServer = queryableDruidServer.getServer(); + final ServerType type = druidServer.getType(); + final Map<String, DataSegment> segments = new HashMap<>(druidServer.getSegments()); + final long isRealtime = druidServer.segmentReplicatable() ? 0 : 1; + for (Map.Entry<String, DataSegment> segmentEntry : segments.entrySet()) { + String segmentId = segmentEntry.getKey(); + DataSegment segment = segmentEntry.getValue(); + int numReplicas = 1; + if (availableSegments.containsKey(segmentId)) { + //do not create new row if a segmentId has been seen previously + // but increment the replica count and update row + numReplicas++; + updateRow(segmentId, numReplicas, rows); + continue; + } + availableSegments.putIfAbsent(segmentId, segment); + long isAvailable = 0; + final long isPublished = publishedSegments.containsKey(segmentId) ? 1 : 0; + if (type.toString().equals(ServerType.HISTORICAL.toString()) + || type.toString().equals(ServerType.REALTIME.toString()) + || type.toString().equals(ServerType.INDEXER_EXECUTOR.toString())) { + isAvailable = 1; + } + String payload; + try { + payload = jsonMapper.writeValueAsString(segment); + } + catch (JsonProcessingException e) { + log.error(e, "Error getting segment payload for segment %s", segmentId); + throw new RuntimeException(e); + } + final Object[] row = createRow( + segment.getIdentifier(), + segment.getDataSource(), + segment.getInterval().getStart(), + segment.getInterval().getEnd(), + segment.getSize(), + segment.getVersion(), + segment.getShardSpec().getPartitionNum(), + numReplicas, + isPublished, + isAvailable, + isRealtime, + payload + ); + rows.add(row); + } + } + //process publishedSegments + for (Map.Entry<String, DataSegment> segmentEntry : publishedSegments.entrySet()) { + String segmentId = segmentEntry.getKey(); + //skip the published segments which are already processed + if (availableSegments.containsKey(segmentId)) { + continue; + } + DataSegment segment = segmentEntry.getValue(); + String payload; + try { + payload = jsonMapper.writeValueAsString(segment); + } + catch (JsonProcessingException e) { + log.error(e, "Error getting segment payload for segment %s", segmentId); + throw new RuntimeException(e); + } + final Object[] row = createRow( + segment.getIdentifier(), + segment.getDataSource(), + segment.getInterval().getStart(), + segment.getInterval().getEnd(), + segment.getSize(), + segment.getVersion(), + segment.getShardSpec().getPartitionNum(), + 0, + 1, + 0, + 0, + payload + ); + rows.add(row); + } + return Linq4j.asEnumerable(rows); + } + + private void updateRow(String segmentId, int replicas, List<Object[]> rows) + { + Object[] oldRow = null; + Object[] newRow = null; + for (Object[] row : rows) { Review comment: @surekhasaharan Was this comment addressed? ---------------------------------------------------------------- This is an automated message from the Apache Git Service. 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