[
https://issues.apache.org/jira/browse/DRILL-4706?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15627800#comment-15627800
]
ASF GitHub Bot commented on DRILL-4706:
---------------------------------------
Github user sudheeshkatkam commented on a diff in the pull request:
https://github.com/apache/drill/pull/639#discussion_r86074701
--- 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 {
--- End diff --
When to use this vs HardAffinityFragmentParallelizer?
> Fragment planning causes Drillbits to read remote chunks when local copies
> are available
> ----------------------------------------------------------------------------------------
>
> Key: DRILL-4706
> URL: https://issues.apache.org/jira/browse/DRILL-4706
> Project: Apache Drill
> Issue Type: Bug
> Components: Query Planning & Optimization
> Affects Versions: 1.6.0
> Environment: CentOS, RHEL
> Reporter: Kunal Khatua
> Assignee: Sorabh Hamirwasia
> Labels: performance, planning
>
> When a table (datasize=70GB) of 160 parquet files (each having a single
> rowgroup and fitting within one chunk) is available on a 10-node setup with
> replication=3 ; a pure data scan query causes about 2% of the data to be read
> remotely.
> Even with the creation of metadata cache, the planner is selecting a
> sub-optimal plan of executing the SCAN fragments such that some of the data
> is served from a remote server.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
