jon-wei commented on a change in pull request #6094: Introduce SystemSchema tables (#5989) URL: https://github.com/apache/incubator-druid/pull/6094#discussion_r219657965
########## File path: sql/src/main/java/org/apache/druid/sql/calcite/schema/SystemSchema.java ########## @@ -0,0 +1,587 @@ +/* + * 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.druid.sql.calcite.schema; + +import com.fasterxml.jackson.core.JsonProcessingException; +import com.fasterxml.jackson.core.type.TypeReference; +import com.fasterxml.jackson.databind.JavaType; +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.common.collect.Iterables; +import com.google.common.util.concurrent.ListenableFuture; +import com.google.inject.Inject; +import org.apache.calcite.DataContext; +import org.apache.calcite.linq4j.DefaultEnumerable; +import org.apache.calcite.linq4j.Enumerable; +import org.apache.calcite.linq4j.Enumerator; +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.apache.druid.client.DruidServer; +import org.apache.druid.client.JsonParserIterator; +import org.apache.druid.client.TimelineServerView; +import org.apache.druid.client.coordinator.Coordinator; +import org.apache.druid.client.indexing.IndexingService; +import org.apache.druid.client.selector.QueryableDruidServer; +import org.apache.druid.discovery.DruidLeaderClient; +import org.apache.druid.indexer.TaskStatusPlus; +import org.apache.druid.java.util.common.ISE; +import org.apache.druid.java.util.common.StringUtils; +import org.apache.druid.java.util.common.logger.Logger; +import org.apache.druid.java.util.http.client.Request; +import org.apache.druid.java.util.http.client.io.AppendableByteArrayInputStream; +import org.apache.druid.java.util.http.client.response.ClientResponse; +import org.apache.druid.java.util.http.client.response.InputStreamResponseHandler; +import org.apache.druid.segment.column.ValueType; +import org.apache.druid.server.security.AuthorizerMapper; +import org.apache.druid.sql.calcite.table.RowSignature; +import org.apache.druid.timeline.DataSegment; +import org.jboss.netty.handler.codec.http.HttpMethod; +import org.jboss.netty.handler.codec.http.HttpResponse; + +import javax.servlet.http.HttpServletResponse; +import java.io.IOException; +import java.io.InputStream; +import java.util.ArrayList; +import java.util.HashMap; +import java.util.HashSet; +import java.util.Iterator; +import java.util.List; +import java.util.Map; +import java.util.Map.Entry; +import java.util.Set; +import java.util.concurrent.ConcurrentSkipListMap; +import java.util.concurrent.ExecutionException; + +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 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("num_rows", 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("server_host", 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 { + SEGMENT_SERVERS_TABLE_SIZE = SERVERSEGMENTS_SIGNATURE.getRowOrder().size(); + } + + @Inject + public SystemSchema( + final DruidSchema druidSchema, + final TimelineServerView serverView, + final AuthorizerMapper authorizerMapper, + final @Coordinator DruidLeaderClient coordinatorDruidLeaderClient, + final @IndexingService DruidLeaderClient overlordDruidLeaderClient, + final ObjectMapper jsonMapper + ) + { + Preconditions.checkNotNull(serverView, "serverView"); + BytesAccumulatingResponseHandler responseHandler = new BytesAccumulatingResponseHandler(); + this.tableMap = ImmutableMap.of( + SEGMENTS_TABLE, new SegmentsTable(druidSchema, coordinatorDruidLeaderClient, jsonMapper, responseHandler), + SERVERS_TABLE, new ServersTable(serverView), + SEGMENT_SERVERS_TABLE, new ServerSegmentsTable(serverView), + TASKS_TABLE, new TasksTable(overlordDruidLeaderClient, jsonMapper, responseHandler) + ); + } + + @Override + public Map<String, Table> getTableMap() + { + return tableMap; + } + + static class SegmentsTable extends AbstractTable implements ScannableTable + { + private final DruidSchema druidSchema; + private final DruidLeaderClient druidLeaderClient; + private final ObjectMapper jsonMapper; + private final BytesAccumulatingResponseHandler responseHandler; + + public SegmentsTable( + DruidSchema druidSchemna, + DruidLeaderClient druidLeaderClient, + ObjectMapper jsonMapper, + BytesAccumulatingResponseHandler responseHandler + ) + { + this.druidSchema = druidSchemna; + this.druidLeaderClient = druidLeaderClient; + this.jsonMapper = jsonMapper; + this.responseHandler = responseHandler; + } + + @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) + { + + //get available segments from druidSchema + Map<String, ConcurrentSkipListMap<DataSegment, SegmentMetadataHolder>> getSegmentMetadataInfo = druidSchema.getSegmentMetadataInfo(); + final Map<DataSegment, SegmentMetadataHolder> availableSegmentMetadata = new HashMap<>(); + for (ConcurrentSkipListMap<DataSegment, SegmentMetadataHolder> val : getSegmentMetadataInfo.values()) { + availableSegmentMetadata.putAll(val); + } + final Iterator<Entry<DataSegment, SegmentMetadataHolder>> availableSegmentEntries = availableSegmentMetadata.entrySet() + .iterator(); + + //get published segments from coordinator + final JsonParserIterator<DataSegment> metadataSegments = getMetadataSegments( + druidLeaderClient, + jsonMapper, + responseHandler + ); + + Set<String> availableSegmentIds = new HashSet<>(); + final FluentIterable<Object[]> availableSegments = FluentIterable + .from(() -> availableSegmentEntries) + .transform(val -> { + try { + if (!availableSegmentIds.contains(val.getKey().getIdentifier())) { + availableSegmentIds.add(val.getKey().getIdentifier()); + } + return new Object[]{ + val.getKey().getIdentifier(), + val.getKey().getDataSource(), + val.getKey().getInterval().getStart(), + val.getKey().getInterval().getEnd(), + val.getKey().getSize(), + val.getKey().getVersion(), + val.getKey().getShardSpec().getPartitionNum(), + val.getValue().getNumReplicas(), + val.getValue().getNumRows(), + val.getValue().isPublished(), + val.getValue().isAvailable(), + val.getValue().isRealtime(), + jsonMapper.writeValueAsString(val.getKey()) + }; + } + catch (JsonProcessingException e) { + log.error(e, "Error getting segment payload for segment %s", val.getKey().getIdentifier()); + throw new RuntimeException(e); + } + }); + + final FluentIterable<Object[]> publishedSegments = FluentIterable + .from(() -> metadataSegments) + .transform(val -> { + try { + if (availableSegmentIds.contains(val.getIdentifier())) { + return null; + } + return new Object[]{ + val.getIdentifier(), + val.getDataSource(), + val.getInterval().getStart(), + val.getInterval().getEnd(), + val.getSize(), + val.getVersion(), + val.getShardSpec().getPartitionNum(), + 0, + -1, + 1, + 0, + 0, + jsonMapper.writeValueAsString(val) + }; + } + catch (JsonProcessingException e) { + log.error(e, "Error getting segment payload for segment %s", val.getIdentifier()); + throw new RuntimeException(e); + } + }); + + Iterable<Object[]> allSegments = Iterables.unmodifiableIterable( + Iterables.concat(availableSegments, publishedSegments)); + + return Linq4j.asEnumerable(allSegments).where(t -> t != null); + + } + + // Note that coordinator must be up to get segments + JsonParserIterator<DataSegment> getMetadataSegments( + DruidLeaderClient coordinatorClient, + ObjectMapper jsonMapper, + BytesAccumulatingResponseHandler responseHandler + ) + { + + Request request; + try { + request = coordinatorClient.makeRequest( + HttpMethod.GET, + StringUtils.format("/druid/coordinator/v1/metadata/segments") + ); + } + catch (IOException e) { + throw new RuntimeException(e); + } + ListenableFuture<InputStream> future = coordinatorClient.goStream( + request, + responseHandler + ); + try { + future.get(); + } + catch (InterruptedException | ExecutionException e) { + throw new RuntimeException(e); + } + if (responseHandler.getStatus() != HttpServletResponse.SC_OK) { + throw new ISE( + "Error while fetching metadata segments status[%s] description[%s]", + responseHandler.status, + responseHandler.description + ); + } + final JavaType typeRef = jsonMapper.getTypeFactory().constructType(new TypeReference<DataSegment>() + { + }); + JsonParserIterator<DataSegment> iterator = new JsonParserIterator<>( + typeRef, + future, + request.getUrl().toString(), + null, + request.getUrl().getHost(), + jsonMapper + ); + return iterator; + } + } + + static class ServersTable extends AbstractTable implements ScannableTable + { + private final TimelineServerView serverView; + + public ServersTable(TimelineServerView serverView) + { + this.serverView = serverView; + } + + @Override + public RelDataType getRowType(RelDataTypeFactory typeFactory) + { + return SERVERS_SIGNATURE.getRelDataType(typeFactory); + } + + @Override + public TableType getJdbcTableType() + { + return TableType.SYSTEM_TABLE; + } + + @Override + public Enumerable<Object[]> scan(DataContext root) + { + Map<String, QueryableDruidServer> serverViewClients = serverView.getClients(); + final FluentIterable<Object[]> results = FluentIterable + .from(serverViewClients.values()) + .transform(val -> new Object[]{ + val.getServer().getHost(), + val.getServer().getHost().split(":")[0], + val.getServer().getScheme(), + val.getServer().getType(), + val.getServer().getTier(), + val.getServer().getCurrSize(), + val.getServer().getMaxSize() + }); + return Linq4j.asEnumerable(results); + } + } + + private static class ServerSegmentsTable extends AbstractTable implements ScannableTable + { + private final TimelineServerView serverView; + + public ServerSegmentsTable(TimelineServerView serverView) + { + this.serverView = serverView; + } + + @Override + public RelDataType getRowType(RelDataTypeFactory typeFactory) + { + return SERVERSEGMENTS_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 Map<String, QueryableDruidServer> serverViewClients = serverView.getClients(); + for (QueryableDruidServer queryableDruidServer : serverViewClients.values()) { + final DruidServer druidServer = queryableDruidServer.getServer(); + final Map<String, DataSegment> segmentMap = druidServer.getSegments(); + for (DataSegment segment : segmentMap.values()) { + Object[] row = new Object[SEGMENT_SERVERS_TABLE_SIZE]; + row[0] = druidServer.getHost(); + row[1] = segment.getIdentifier(); + rows.add(row); + } + } + return Linq4j.asEnumerable(rows); + } + } + + static class TasksTable extends AbstractTable implements ScannableTable + { + private final DruidLeaderClient druidLeaderClient; + private final ObjectMapper jsonMapper; + private final BytesAccumulatingResponseHandler responseHandler; + + public TasksTable( + DruidLeaderClient druidLeaderClient, + ObjectMapper jsonMapper, + BytesAccumulatingResponseHandler responseHandler + ) + { + this.druidLeaderClient = druidLeaderClient; + this.jsonMapper = jsonMapper; + this.responseHandler = responseHandler; + } + + @Override + public RelDataType getRowType(RelDataTypeFactory typeFactory) + { + return TASKS_SIGNATURE.getRelDataType(typeFactory); + } + + @Override + public TableType getJdbcTableType() + { + return TableType.SYSTEM_TABLE; + } + + @Override + public Enumerable<Object[]> scan(DataContext root) + { + class TasksEnumerable extends DefaultEnumerable<Object[]> + { + private final JsonParserIterator<TaskStatusPlus> it; + + public TasksEnumerable(JsonParserIterator<TaskStatusPlus> tasks) + { + this.it = tasks; + } + + @Override + public Iterator<Object[]> iterator() + { + throw new UnsupportedOperationException("Do not use iterator(), it cannot be closed."); + } + + @Override + public Enumerator<Object[]> enumerator() + { + return new Enumerator<Object[]>() + { + @Override + public Object[] current() + { + TaskStatusPlus task = it.next(); + return new Object[]{task.getId(), task.getType(), + task.getDataSource(), + task.getCreatedTime(), + task.getQueueInsertionTime(), + task.getState(), + task.getRunnerTaskState(), + task.getDuration(), + task.getLocation() != null + ? task.getLocation().getHost() + ":" + (task.getLocation().getTlsPort() + == -1 + ? task.getLocation() + .getPort() + : task.getLocation().getTlsPort()) + : null, + task.getErrorMsg()}; + } + + @Override + public boolean moveNext() + { + return it.hasNext(); + } + + @Override + public void reset() + { + + } + + @Override + public void close() + { + try { + it.close(); + } + catch (IOException e) { + throw new RuntimeException(e); + } + } + }; + } + } + + return new TasksEnumerable(getTasks(druidLeaderClient, jsonMapper, responseHandler)); + } + + //Note that overlord must be up to get tasks + protected JsonParserIterator<TaskStatusPlus> getTasks( Review comment: this can also be a static method outside of TasksTable ---------------------------------------------------------------- This is an automated message from the Apache Git Service. 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