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https://issues.apache.org/jira/browse/DRILL-6385?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16561420#comment-16561420
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ASF GitHub Bot commented on DRILL-6385:
---------------------------------------
weijietong commented on a change in pull request #1334: DRILL-6385: Support
JPPD feature
URL: https://github.com/apache/drill/pull/1334#discussion_r206014055
##########
File path:
exec/java-exec/src/main/java/org/apache/drill/exec/work/filter/BloomFilterCreator.java
##########
@@ -0,0 +1,41 @@
+/*
+ * 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.drill.exec.work.filter;
+
+import io.netty.buffer.DrillBuf;
+import org.apache.drill.exec.memory.BufferAllocator;
+
+public class BloomFilterCreator {
Review comment:
There's no intersection of the two separate BFs. The intersection meaning is
implemented indirectly at the probe side `ScanBatch`. The separated BFs filter
the probe side columns independently and set a BitSet (which indicates the
possible rows matched the join condition ) together. This part of codes is at
the `ScanBatch`'s `applyRuntimeFilter` and `computeBitSet` methods.
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> Support JPPD (Join Predicate Push Down)
> ---------------------------------------
>
> Key: DRILL-6385
> URL: https://issues.apache.org/jira/browse/DRILL-6385
> Project: Apache Drill
> Issue Type: New Feature
> Components: Server, Execution - Flow
> Affects Versions: 1.14.0
> Reporter: weijie.tong
> Assignee: weijie.tong
> Priority: Major
>
> This feature is to support the JPPD (Join Predicate Push Down). It will
> benefit the HashJoin ,Broadcast HashJoin performance by reducing the number
> of rows to send across the network ,the memory consumed. This feature is
> already supported by Impala which calls it RuntimeFilter
> ([https://www.cloudera.com/documentation/enterprise/5-9-x/topics/impala_runtime_filtering.html]).
> The first PR will try to push down a bloom filter of HashJoin node to
> Parquet’s scan node. The propose basic procedure is described as follow:
> # The HashJoin build side accumulate the equal join condition rows to
> construct a bloom filter. Then it sends out the bloom filter to the foreman
> node.
> # The foreman node accept the bloom filters passively from all the fragments
> that has the HashJoin operator. It then aggregates the bloom filters to form
> a global bloom filter.
> # The foreman node broadcasts the global bloom filter to all the probe side
> scan nodes which maybe already have send out partial data to the hash join
> nodes(currently the hash join node will prefetch one batch from both sides ).
> 4. The scan node accepts a global bloom filter from the foreman node.
> It will filter the rest rows satisfying the bloom filter.
>
> To implement above execution flow, some main new notion described as below:
> 1. RuntimeFilter
> It’s a filter container which may contain BloomFilter or MinMaxFilter.
> 2. RuntimeFilterReporter
> It wraps the logic to send hash join’s bloom filter to the foreman.The
> serialized bloom filter will be sent out through the data tunnel.This object
> will be instanced by the FragmentExecutor and passed to the
> FragmentContext.So the HashJoin operator can obtain it through the
> FragmentContext.
> 3. RuntimeFilterRequestHandler
> It is responsible to accept a SendRuntimeFilterRequest RPC to strip the
> actual BloomFilter from the network. It then translates this filter to the
> WorkerBee’s new interface registerRuntimeFilter.
> Another RPC type is BroadcastRuntimeFilterRequest. It will register the
> accepted global bloom filter to the WorkerBee by the registerRuntimeFilter
> method and then propagate to the FragmentContext through which the probe side
> scan node can fetch the aggregated bloom filter.
> 4.RuntimeFilterManager
> The foreman will instance a RuntimeFilterManager .It will indirectly get
> every RuntimeFilter by the WorkerBee. Once all the BloomFilters have been
> accepted and aggregated . It will broadcast the aggregated bloom filter to
> all the probe side scan nodes through the data tunnel by a
> BroadcastRuntimeFilterRequest RPC.
> 5. RuntimeFilterEnableOption
> A global option will be added to decide whether to enable this new feature.
>
> Welcome suggestion and advice from you.The related PR will be presented as
> soon as possible.
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