Github user sudheeshkatkam commented on a diff in the pull request:
https://github.com/apache/drill/pull/639#discussion_r86073626
--- Diff:
exec/java-exec/src/main/java/org/apache/drill/exec/planner/fragment/LocalAffinityFragmentParallelizer.java
---
@@ -0,0 +1,149 @@
+/**
+ * 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
+ * <p/>
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * <p/>
+ * 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.drill.exec.planner.fragment;
+
+import com.google.common.collect.Lists;
+import org.apache.drill.exec.physical.EndpointAffinity;
+import org.apache.drill.exec.physical.PhysicalOperatorSetupException;
+import org.apache.drill.exec.proto.CoordinationProtos.DrillbitEndpoint;
+
+import java.util.Map;
+import java.util.List;
+import java.util.Collection;
+import java.util.HashMap;
+
+
+/**
+ * Implementation of {@link FragmentParallelizer} where fragment has zero
or more endpoints.
+ * This is for Parquet Scan Fragments only. Fragment placement is done
preferring strict
+ * data locality.
+ */
+public class LocalAffinityFragmentParallelizer implements
FragmentParallelizer {
+ public static final LocalAffinityFragmentParallelizer INSTANCE = new
LocalAffinityFragmentParallelizer();
+
+ @Override
+ public void parallelizeFragment(final Wrapper fragmentWrapper, final
ParallelizationParameters parameters, final Collection<DrillbitEndpoint>
activeEndpoints) throws PhysicalOperatorSetupException {
+
+ // Find the parallelization width of fragment
+ final Stats stats = fragmentWrapper.getStats();
+ final ParallelizationInfo parallelizationInfo =
stats.getParallelizationInfo();
+
+ // 1. Find the parallelization based on cost. Use max cost of all
operators in this fragment; this is consistent
+ // with the calculation that ExcessiveExchangeRemover uses.
+ int width = (int) Math.ceil(stats.getMaxCost() /
parameters.getSliceTarget());
+
+ // 2. Cap the parallelization width by fragment level width limit
and system level per query width limit
+ width = Math.min(width,
Math.min(parallelizationInfo.getMaxWidth(), parameters.getMaxGlobalWidth()));
+
+ // 3. Cap the parallelization width by system level per node width
limit
+ width = Math.min(width, parameters.getMaxWidthPerNode() *
activeEndpoints.size());
+
+ // 4. Make sure width is at least the min width enforced by
operators
+ width = Math.max(parallelizationInfo.getMinWidth(), width);
+
+ // 5. Make sure width is at most the max width enforced by
operators
+ width = Math.min(parallelizationInfo.getMaxWidth(), width);
+
+ // 6: Finally make sure the width is at least one
+ width = Math.max(1, width);
+
+ List<DrillbitEndpoint> endpointPool = Lists.newArrayList();
--- End diff --
final (and wherever possible, generously)
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at infrastruct...@apache.org or file a JIRA ticket
with INFRA.
---
