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Show candidate hosts for the given query (apache#2282)
* Show candidate hosts for the given query * Added test cases & minor changes to address comments * Changed path-param to query-pram for intervals/numCandidates
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,78 @@ | ||
| /* | ||
| * Licensed to Metamarkets Group Inc. (Metamarkets) under one | ||
| * or more contributor license agreements. See the NOTICE file | ||
| * distributed with this work for additional information | ||
| * regarding copyright ownership. Metamarkets 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.client; | ||
|
|
||
| import com.google.common.collect.Lists; | ||
| import io.druid.client.selector.ServerSelector; | ||
| import io.druid.query.DataSource; | ||
| import io.druid.query.LocatedSegmentDescriptor; | ||
| import io.druid.query.SegmentDescriptor; | ||
| import io.druid.query.TableDataSource; | ||
| import io.druid.server.coordination.DruidServerMetadata; | ||
| import io.druid.timeline.TimelineLookup; | ||
| import io.druid.timeline.TimelineObjectHolder; | ||
| import io.druid.timeline.partition.PartitionChunk; | ||
| import org.joda.time.Interval; | ||
|
|
||
| import java.util.Collections; | ||
| import java.util.List; | ||
|
|
||
| /** | ||
| */ | ||
| public class ServerViewUtil | ||
| { | ||
| public static List<LocatedSegmentDescriptor> getTargetLocations( | ||
| TimelineServerView serverView, | ||
| String datasource, | ||
| List<Interval> intervals, | ||
| int numCandidates | ||
| ) | ||
| { | ||
| return getTargetLocations(serverView, new TableDataSource(datasource), intervals, numCandidates); | ||
| } | ||
|
|
||
| public static List<LocatedSegmentDescriptor> getTargetLocations( | ||
| TimelineServerView serverView, | ||
| DataSource datasource, | ||
| List<Interval> intervals, | ||
| int numCandidates | ||
| ) | ||
| { | ||
| TimelineLookup<String, ServerSelector> timeline = serverView.getTimeline(datasource); | ||
| if (timeline == null) { | ||
| return Collections.emptyList(); | ||
| } | ||
| List<LocatedSegmentDescriptor> located = Lists.newArrayList(); | ||
| for (Interval interval : intervals) { | ||
| for (TimelineObjectHolder<String, ServerSelector> holder : timeline.lookup(interval)) { | ||
| for (PartitionChunk<ServerSelector> chunk : holder.getObject()) { | ||
| ServerSelector selector = chunk.getObject(); | ||
| final SegmentDescriptor descriptor = new SegmentDescriptor( | ||
| holder.getInterval(), holder.getVersion(), chunk.getChunkNumber() | ||
| ); | ||
| long size = selector.getSegment().getSize(); | ||
| List<DruidServerMetadata> candidates = selector.getCandidates(numCandidates); | ||
| located.add(new LocatedSegmentDescriptor(descriptor, size, candidates)); | ||
| } | ||
| } | ||
| } | ||
| return located; | ||
| } | ||
| } |
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134 changes: 134 additions & 0 deletions
134
server/src/main/java/io/druid/query/LocatedSegmentDescriptor.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,134 @@ | ||
| /* | ||
| * Licensed to Metamarkets Group Inc. (Metamarkets) under one | ||
| * or more contributor license agreements. See the NOTICE file | ||
| * distributed with this work for additional information | ||
| * regarding copyright ownership. Metamarkets 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.query; | ||
|
|
||
| import com.fasterxml.jackson.annotation.JsonCreator; | ||
| import com.fasterxml.jackson.annotation.JsonProperty; | ||
| import com.google.common.collect.ImmutableList; | ||
| import io.druid.server.coordination.DruidServerMetadata; | ||
| import org.joda.time.Interval; | ||
|
|
||
| import java.util.List; | ||
| import java.util.Objects; | ||
|
|
||
| /** | ||
| * public, evolving | ||
| * <p/> | ||
| * extended version of SegmentDescriptor, which is internal class, with location and size information attached | ||
| */ | ||
| public class LocatedSegmentDescriptor | ||
| { | ||
| private final Interval interval; | ||
| private final String version; | ||
| private final int partitionNumber; | ||
| private final long size; | ||
| private final List<DruidServerMetadata> locations; | ||
|
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||
| @JsonCreator | ||
| public LocatedSegmentDescriptor( | ||
| @JsonProperty("interval") Interval interval, | ||
| @JsonProperty("version") String version, | ||
| @JsonProperty("partitionNumber") int partitionNumber, | ||
| @JsonProperty("size") long size, | ||
| @JsonProperty("locations") List<DruidServerMetadata> locations | ||
| ) | ||
| { | ||
| this.interval = interval; | ||
| this.version = version; | ||
| this.partitionNumber = partitionNumber; | ||
| this.size = size; | ||
| this.locations = locations == null ? ImmutableList.<DruidServerMetadata>of() : locations; | ||
| } | ||
|
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| public LocatedSegmentDescriptor(SegmentDescriptor descriptor, long size, List<DruidServerMetadata> candidates) | ||
| { | ||
| this(descriptor.getInterval(), descriptor.getVersion(), descriptor.getPartitionNumber(), size, candidates); | ||
| } | ||
|
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| @JsonProperty("interval") | ||
| public Interval getInterval() | ||
| { | ||
| return interval; | ||
| } | ||
|
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| @JsonProperty("version") | ||
| public String getVersion() | ||
| { | ||
| return version; | ||
| } | ||
|
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| @JsonProperty("partitionNumber") | ||
| public int getPartitionNumber() | ||
| { | ||
| return partitionNumber; | ||
| } | ||
|
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| @JsonProperty("size") | ||
| public long getSize() | ||
| { | ||
| return size; | ||
| } | ||
|
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| @JsonProperty("locations") | ||
| public List<DruidServerMetadata> getLocations() | ||
| { | ||
| return locations; | ||
| } | ||
|
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| @Override | ||
| public boolean equals(Object o) | ||
| { | ||
| if (!(o instanceof LocatedSegmentDescriptor)) { | ||
| return false; | ||
| } | ||
|
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| LocatedSegmentDescriptor other = (LocatedSegmentDescriptor) o; | ||
|
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| if (partitionNumber != other.partitionNumber) { | ||
| return false; | ||
| } | ||
| if (!Objects.equals(interval, other.interval)) { | ||
| return false; | ||
| } | ||
| if (!Objects.equals(version, other.version)) { | ||
| return false; | ||
| } | ||
|
|
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| return true; | ||
| } | ||
|
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| @Override | ||
| public int hashCode() | ||
| { | ||
| return Objects.hash(partitionNumber, interval, version); | ||
| } | ||
|
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| @Override | ||
| public String toString() | ||
| { | ||
| return "LocatedSegmentDescriptor{" + | ||
| "interval=" + interval + | ||
| ", version='" + version + '\'' + | ||
| ", partitionNumber=" + partitionNumber + | ||
| ", size=" + size + | ||
| ", locations=" + locations + | ||
| '}'; | ||
| } | ||
| } |
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