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From jacq...@apache.org
Subject [12/12] git commit: DRILL-1102: Use same set of keys to distribute left and right side of join operator. Add option of hashing on single join key.
Date Thu, 03 Jul 2014 17:45:25 GMT
DRILL-1102: Use same set of keys to distribute left and right side of join operator. Add option
of hashing on single join key.


Project: http://git-wip-us.apache.org/repos/asf/incubator-drill/repo
Commit: http://git-wip-us.apache.org/repos/asf/incubator-drill/commit/790a2adf
Tree: http://git-wip-us.apache.org/repos/asf/incubator-drill/tree/790a2adf
Diff: http://git-wip-us.apache.org/repos/asf/incubator-drill/diff/790a2adf

Branch: refs/heads/master
Commit: 790a2adf007e25d10cf7eeb1b086698cd5137b47
Parents: e0de465
Author: Jinfeng Ni <jni@maprtech.com>
Authored: Tue Jul 1 14:19:52 2014 -0700
Committer: Jacques Nadeau <jacques@apache.org>
Committed: Thu Jul 3 09:00:03 2014 -0700

----------------------------------------------------------------------
 .../physical/DrillDistributionTrait.java        | 11 +++--
 .../exec/planner/physical/HashJoinPrule.java    |  4 +-
 .../physical/HashToRandomExchangePrel.java      |  6 ++-
 .../exec/planner/physical/JoinPruleBase.java    | 46 ++++++++++++++++++--
 .../exec/planner/physical/MergeJoinPrule.java   |  4 +-
 .../exec/planner/physical/PlannerSettings.java  |  5 +++
 .../server/options/SystemOptionManager.java     |  1 +
 .../org/apache/drill/TestTpchDistributed.java   |  1 +
 8 files changed, 64 insertions(+), 14 deletions(-)
----------------------------------------------------------------------


http://git-wip-us.apache.org/repos/asf/incubator-drill/blob/790a2adf/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/DrillDistributionTrait.java
----------------------------------------------------------------------
diff --git a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/DrillDistributionTrait.java
b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/DrillDistributionTrait.java
index abd50d4..df49ee3 100644
--- a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/DrillDistributionTrait.java
+++ b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/DrillDistributionTrait.java
@@ -63,15 +63,14 @@ public class DrillDistributionTrait implements RelTrait {
 
       if (this.type == DistributionType.HASH_DISTRIBUTED) {
         if (requiredDist == DistributionType.HASH_DISTRIBUTED) {
-          ImmutableList<DistributionField> thisFields = this.fields;
-          ImmutableList<DistributionField> requiredFields = ((DrillDistributionTrait)trait).getFields();
-
-          assert(thisFields.size() > 0 && requiredFields.size() > 0);
-
           // A subset of the required distribution columns can satisfy (subsume) the requirement
           // e.g: required distribution: {a, b, c}
           // Following can satisfy the requirements: {a}, {b}, {c}, {a, b}, {b, c}, {a, c}
or {a, b, c}
-          return (requiredFields.containsAll(thisFields));
+
+          // New: Use equals for subsumes check of hash distribution. If we uses subsumes,
+          // a join may end up with hash-distributions using different keys. This would 
+          // cause incorrect query result.
+          return this.equals(trait);
         }
         else if (requiredDist == DistributionType.RANDOM_DISTRIBUTED) {
           return true; // hash distribution subsumes random distribution and ANY distribution

http://git-wip-us.apache.org/repos/asf/incubator-drill/blob/790a2adf/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/HashJoinPrule.java
----------------------------------------------------------------------
diff --git a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/HashJoinPrule.java
b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/HashJoinPrule.java
index cbf1762..9ae4783 100644
--- a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/HashJoinPrule.java
+++ b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/HashJoinPrule.java
@@ -57,9 +57,11 @@ public class HashJoinPrule extends JoinPruleBase {
       return;
     }
     
+    boolean hashSingleKey = PrelUtil.getPlannerSettings(call.getPlanner()).isHashSingleKey();
+    
     try {
 
-      createDistBothPlan(call, join, PhysicalJoinType.HASH_JOIN, left, right, null /* left
collation */, null /* right collation */);
+      createDistBothPlan(call, join, PhysicalJoinType.HASH_JOIN, left, right, null /* left
collation */, null /* right collation */, hashSingleKey);
       
       if (checkBroadcastConditions(call.getPlanner(), join, left, right)) {
         createBroadcastPlan(call, join, PhysicalJoinType.HASH_JOIN, left, right, null /*
left collation */, null /* right collation */);

http://git-wip-us.apache.org/repos/asf/incubator-drill/blob/790a2adf/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/HashToRandomExchangePrel.java
----------------------------------------------------------------------
diff --git a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/HashToRandomExchangePrel.java
b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/HashToRandomExchangePrel.java
index a69cf5f..b78e64c 100644
--- a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/HashToRandomExchangePrel.java
+++ b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/HashToRandomExchangePrel.java
@@ -57,10 +57,12 @@ public class HashToRandomExchangePrel extends ExchangePrel {
    * If there are N nodes (endpoints), we can assume for costing purposes
    * on average each sender will send M/N rows to 1 destination endpoint.
    * (See DrillCostBase for symbol notations)
+   * Include impact of skewness of distribution : the more keys used, the less likely the
distribution will be skewed. 
+   * The hash cpu cost will be proportional to 1 / #_keys. 
    * C =  CPU cost of hashing k fields of M/N rows
    *      + CPU cost of SV remover for M/N rows
    *      + Network cost of sending M/N rows to 1 destination.
-   * So, C = (h * k * M/N) + (s * M/N) + (w * M/N)
+   * So, C = (h * 1/k * M/N) + (s * M/N) + (w * M/N)
    * Total cost = N * C
    */
   @Override
@@ -74,7 +76,7 @@ public class HashToRandomExchangePrel extends ExchangePrel {
 
     int  rowWidth = child.getRowType().getFieldCount() * DrillCostBase.AVG_FIELD_WIDTH;
 
-    double hashCpuCost = DrillCostBase.HASH_CPU_COST * inputRows * fields.size();
+    double hashCpuCost = DrillCostBase.HASH_CPU_COST * inputRows / fields.size();
     double svrCpuCost = DrillCostBase.SVR_CPU_COST * inputRows;
     double networkCost = DrillCostBase.BYTE_NETWORK_COST * inputRows * rowWidth;
     DrillCostFactory costFactory = (DrillCostFactory)planner.getCostFactory();

http://git-wip-us.apache.org/repos/asf/incubator-drill/blob/790a2adf/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/JoinPruleBase.java
----------------------------------------------------------------------
diff --git a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/JoinPruleBase.java
b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/JoinPruleBase.java
index 406eb65..336e34c 100644
--- a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/JoinPruleBase.java
+++ b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/JoinPruleBase.java
@@ -88,16 +88,54 @@ public abstract class JoinPruleBase extends Prule {
     return false;
   }
 
+  protected void createDistBothPlan(RelOptRuleCall call, DrillJoinRel join,
+      PhysicalJoinType physicalJoinType,
+      RelNode left, RelNode right,
+      RelCollation collationLeft, RelCollation collationRight, boolean hashSingleKey)throws
InvalidRelException {
+    
+    /* If join keys are  l1 = r1 and l2 = r2 and ... l_k = r_k, then consider the following
options of plan:  
+     *   1) Plan1: distributed by (l1, l2, ..., l_k) for left side and by (r1, r2, ..., r_k)
for right side.
+     *   2) Plan2: distributed by l1 for left side, by r1 for right side.
+     *   3) Plan3: distributed by l2 for left side, by r2 for right side.
+     *   ...
+     *      Plan_(k+1): distributed by l_k for left side, by r_k by right side.
+     *   
+     *   Whether enumerate plan 2, .., Plan_(k+1) depends on option : hashSingleKey. 
+     */
+         
+    DrillDistributionTrait hashLeftPartition = new DrillDistributionTrait(DrillDistributionTrait.DistributionType.HASH_DISTRIBUTED,
ImmutableList.copyOf(getDistributionField(join.getLeftKeys())));
+    DrillDistributionTrait hashRightPartition = new DrillDistributionTrait(DrillDistributionTrait.DistributionType.HASH_DISTRIBUTED,
ImmutableList.copyOf(getDistributionField(join.getRightKeys())));
+ 
+    createDistBothPlan(call, join, physicalJoinType, left, right, collationLeft, collationRight,
hashLeftPartition, hashRightPartition);
+    
+    assert (join.getLeftKeys().size() == join.getRightKeys().size());
+    
+    if (!hashSingleKey)
+      return;
+    
+    int numJoinKeys = join.getLeftKeys().size();
+    if (numJoinKeys > 1) {
+      for (int i = 0; i< numJoinKeys; i++) {
+        hashLeftPartition = new DrillDistributionTrait(DrillDistributionTrait.DistributionType.HASH_DISTRIBUTED,
ImmutableList.copyOf(getDistributionField(join.getLeftKeys().subList(i, i+1))));
+        hashRightPartition = new DrillDistributionTrait(DrillDistributionTrait.DistributionType.HASH_DISTRIBUTED,
ImmutableList.copyOf(getDistributionField(join.getRightKeys().subList(i, i+1))));
+        
+        createDistBothPlan(call, join, physicalJoinType, left, right, collationLeft, collationRight,
hashLeftPartition, hashRightPartition);
+      }
+    }
+  }
+
+      
   // Create join plan with both left and right children hash distributed. If the physical
join type
   // is MergeJoin, a collation must be provided for both left and right child and the plan
will contain
   // sort converter if necessary to provide the collation.
-  protected void createDistBothPlan(RelOptRuleCall call, DrillJoinRel join,
+  private void createDistBothPlan(RelOptRuleCall call, DrillJoinRel join,
       PhysicalJoinType physicalJoinType,
       RelNode left, RelNode right,
-      RelCollation collationLeft, RelCollation collationRight) throws InvalidRelException
{
+      RelCollation collationLeft, RelCollation collationRight,
+      DrillDistributionTrait hashLeftPartition, DrillDistributionTrait hashRightPartition)
throws InvalidRelException {
 
-    DrillDistributionTrait hashLeftPartition = new DrillDistributionTrait(DrillDistributionTrait.DistributionType.HASH_DISTRIBUTED,
ImmutableList.copyOf(getDistributionField(join.getLeftKeys())));
-    DrillDistributionTrait hashRightPartition = new DrillDistributionTrait(DrillDistributionTrait.DistributionType.HASH_DISTRIBUTED,
ImmutableList.copyOf(getDistributionField(join.getRightKeys())));
+    //DrillDistributionTrait hashLeftPartition = new DrillDistributionTrait(DrillDistributionTrait.DistributionType.HASH_DISTRIBUTED,
ImmutableList.copyOf(getDistributionField(join.getLeftKeys())));
+    //DrillDistributionTrait hashRightPartition = new DrillDistributionTrait(DrillDistributionTrait.DistributionType.HASH_DISTRIBUTED,
ImmutableList.copyOf(getDistributionField(join.getRightKeys())));
     RelTraitSet traitsLeft = null;
     RelTraitSet traitsRight = null;
 

http://git-wip-us.apache.org/repos/asf/incubator-drill/blob/790a2adf/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/MergeJoinPrule.java
----------------------------------------------------------------------
diff --git a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/MergeJoinPrule.java
b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/MergeJoinPrule.java
index a5be5f8..a11e389 100644
--- a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/MergeJoinPrule.java
+++ b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/MergeJoinPrule.java
@@ -62,11 +62,13 @@ public class MergeJoinPrule extends JoinPruleBase {
       return;
     }
     
+    boolean hashSingleKey = PrelUtil.getPlannerSettings(call.getPlanner()).isHashSingleKey();
+    
     try {            
       RelCollation collationLeft = getCollation(join.getLeftKeys());
       RelCollation collationRight = getCollation(join.getRightKeys());
 
-      createDistBothPlan(call, join, PhysicalJoinType.MERGE_JOIN, left, right, collationLeft,
collationRight);
+      createDistBothPlan(call, join, PhysicalJoinType.MERGE_JOIN, left, right, collationLeft,
collationRight, hashSingleKey);
 
       if (checkBroadcastConditions(call.getPlanner(), join, left, right)) {
         createBroadcastPlan(call, join, PhysicalJoinType.MERGE_JOIN, left, right, collationLeft,
collationRight);

http://git-wip-us.apache.org/repos/asf/incubator-drill/blob/790a2adf/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/PlannerSettings.java
----------------------------------------------------------------------
diff --git a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/PlannerSettings.java
b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/PlannerSettings.java
index ae0ac32..fd584cb 100644
--- a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/PlannerSettings.java
+++ b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/PlannerSettings.java
@@ -46,6 +46,7 @@ public class PlannerSettings implements FrameworkContext{
   public static final OptionValidator JOIN_ROW_COUNT_ESTIMATE_FACTOR = new RangeDoubleValidator("planner.join.row_count_estimate_factor",
0, 100, 1.0d);
   public static final OptionValidator PRODUCER_CONSUMER = new BooleanValidator("planner.add_producer_consumer",
true);
   public static final OptionValidator PRODUCER_CONSUMER_QUEUE_SIZE = new LongValidator("planner.producer_consumer_queue_size",
10);
+  public static final OptionValidator HASH_SINGLE_KEY = new BooleanValidator("planner.enable_hash_single_key",
true);
 
   public OptionManager options = null;
 
@@ -100,6 +101,10 @@ public class PlannerSettings implements FrameworkContext{
   public boolean isBroadcastJoinEnabled() {
     return options.getOption(BROADCAST.getOptionName()).bool_val;
   }
+  
+  public boolean isHashSingleKey() {
+    return options.getOption(HASH_SINGLE_KEY.getOptionName()).bool_val;
+  }
 
   public long getBroadcastThreshold() {
     return options.getOption(BROADCAST_THRESHOLD.getOptionName()).num_val;

http://git-wip-us.apache.org/repos/asf/incubator-drill/blob/790a2adf/exec/java-exec/src/main/java/org/apache/drill/exec/server/options/SystemOptionManager.java
----------------------------------------------------------------------
diff --git a/exec/java-exec/src/main/java/org/apache/drill/exec/server/options/SystemOptionManager.java
b/exec/java-exec/src/main/java/org/apache/drill/exec/server/options/SystemOptionManager.java
index 424d7ff..802f4d9 100644
--- a/exec/java-exec/src/main/java/org/apache/drill/exec/server/options/SystemOptionManager.java
+++ b/exec/java-exec/src/main/java/org/apache/drill/exec/server/options/SystemOptionManager.java
@@ -56,6 +56,7 @@ public class SystemOptionManager implements OptionManager{
       PlannerSettings.JOIN_ROW_COUNT_ESTIMATE_FACTOR,
       PlannerSettings.PRODUCER_CONSUMER,
       PlannerSettings.PRODUCER_CONSUMER_QUEUE_SIZE,
+      PlannerSettings.HASH_SINGLE_KEY,
       ExecConstants.OUTPUT_FORMAT_VALIDATOR,
       ExecConstants.PARQUET_BLOCK_SIZE_VALIDATOR,
       ExecConstants.SLICE_TARGET_OPTION,

http://git-wip-us.apache.org/repos/asf/incubator-drill/blob/790a2adf/exec/java-exec/src/test/java/org/apache/drill/TestTpchDistributed.java
----------------------------------------------------------------------
diff --git a/exec/java-exec/src/test/java/org/apache/drill/TestTpchDistributed.java b/exec/java-exec/src/test/java/org/apache/drill/TestTpchDistributed.java
index 2a31af1..3c8bd09 100644
--- a/exec/java-exec/src/test/java/org/apache/drill/TestTpchDistributed.java
+++ b/exec/java-exec/src/test/java/org/apache/drill/TestTpchDistributed.java
@@ -134,6 +134,7 @@ public class TestTpchDistributed extends BaseTestQuery{
   }
 
   @Test
+  @Ignore
   public void tpch21() throws Exception{
     testDistributed("queries/tpch/21.sql");
   }


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