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
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.../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(-)
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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
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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
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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
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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
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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
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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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