colocated-without-hints #13943

gortiz · 2024-09-05T15:39:25Z

Right now in order to use colocated joins users need to provide the tableOption hint for each table in the join. This hint contains several attributes and most of them are required even if the information can be obtained from the table config. In fact we explicitly verify that the provided values are the equal to what it is stored in the table config.

This PR changes this optimization to be applied automatically. Although I've been studying other solutions, the simplest solution I've found is to create a rule that:

If the pinot.broker.enable.partition.metadata.manager is true
- If there is no tableOptions hint: Add one tableOptions hint with the values inferred from the table partition info
- If there is a tableOptions
  - For each any attribute that is not set, use the values from the table partition info.

TODO:

Add a pinot config option and a hint to disable this automation
Update older tests and create new ones

codecov-commenter · 2024-09-05T16:30:07Z

Codecov Report

Attention: Patch coverage is 28.35052% with 139 lines in your changes missing coverage. Please review.

Project coverage is 63.76%. Comparing base (59551e4) to head (8512fd2).
Report is 1190 commits behind head on master.

Files with missing lines	Patch %	Lines
.../calcite/rel/rules/PinotImplicitTableHintRule.java	0.00%	78 Missing ⚠️
.../org/apache/pinot/query/routing/WorkerManager.java	43.93%	31 Missing and 6 partials ⚠️
.../java/org/apache/pinot/query/QueryEnvironment.java	74.28%	6 Missing and 3 partials ⚠️
...pinot/calcite/rel/hint/PinotHintStrategyTable.java	0.00%	8 Missing ⚠️
...requesthandler/MultiStageBrokerRequestHandler.java	0.00%	7 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #13943      +/-   ##
============================================
+ Coverage     61.75%   63.76%   +2.01%     
- Complexity      207     1535    +1328     
============================================
  Files          2436     2624     +188     
  Lines        133233   144580   +11347     
  Branches      20636    22122    +1486     
============================================
+ Hits          82274    92189    +9915     
- Misses        44911    45589     +678     
- Partials       6048     6802     +754

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java-11	`63.71% <28.35%> (+2.00%)`	⬆️
java-21	`63.64% <28.35%> (+2.01%)`	⬆️
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ankitsultana · 2024-09-05T18:27:26Z

@gortiz are you aiming to make it so that the entire plan can be colocated when possible?

From Uber side we were planning to add this feature back again this year. For our current implementation that we are using internally for a big use-case, we are able to colocate the entire plan by inferring partition keys for each stage. Though it was doing it in the physical optimization phase and hence is no longer being used in OSS.

gortiz · 2024-09-06T08:58:23Z

The idea is that Pinot should be able to automatically infer whether joins/group by be optimized using the partition distribution. That is not the case right now. Instead users need to specify a tableOptions hint with information that is redundant (Pinot already knows it!).

So this PR adds adds implicit hints if they are not already added (and in case it is, populates the hint with default values if not provided).

Though it was doing it in the physical optimization phase and hence is no longer being used in OSS.

What do you mean with physical optimization? I don't think the term is very well defined in Pinot. Specifically we use to use it to describe how to execute stages in different workers but also it is also used to describe how to map RelNodes into Pinot operators and/or indexes used.

Assuming you mean that you are applying this optimization after calcite rules have been applied (ie in or close to WorkerManager), that is what we are doing here as well. I would love to move the distribution calculations into Calcite (given it has that concept) but this PR is simpler. The code we have right now is applying the optimization in WorkerManager, but only when it makes sense and the hint is present. What this PR does is to add the hint even if the query doesn't include it.

…mization at startup and query time

…fig.useImplicitColocatedByDefault

...ery-planner/src/main/java/org/apache/pinot/calcite/rel/rules/PinotImplicitTableHintRule.java

pinot-query-planner/pom.xml

pom.xml

...ker/src/main/java/org/apache/pinot/broker/requesthandler/MultiStageBrokerRequestHandler.java

pinot-query-planner/src/main/java/org/apache/pinot/query/QueryEnvironment.java

Jackie-Jiang · 2024-09-30T18:29:04Z

pinot-spi/src/main/java/org/apache/pinot/spi/utils/CommonConstants.java

@@ -343,6 +343,8 @@ public static class Broker {
    public static final String CONFIG_OF_ENABLE_PARTITION_METADATA_MANAGER =
        "pinot.broker.enable.partition.metadata.manager";
    public static final boolean DEFAULT_ENABLE_PARTITION_METADATA_MANAGER = false;
+    public static final String IMPLICIT_COLOCATE_JOIN = "pinot.broker.multistage.implicit.colocate";


The added rule is to auto-fill the missing info in the table hint. Should we make the config more explicit about that? This rule will be applied even without JOIN, and leaf stage worker will process each partition in parallel

leaf stage worker will process each partition in parallel

By default we set parallelism to 1, which AFAIU was the default. Therefore this should not change, am I wrong?

That is partition parallelism, i.e. how many threads to use in the following stage after partition is joined. When partition info is set, each partition is processed as a separate query in the leaf stage

I've changed that to do not provide a value for parallelism. Anyway, you are right about the naming. Do you have a suggestion for a new and more precise property name?

Something like AUTO_HINT_PARTITION_INFO or AUTO_APPLY_PARTITION_HINT?

Remember to change this

pinot-query-planner/src/main/java/org/apache/pinot/query/QueryEnvironment.java

...ery-planner/src/main/java/org/apache/pinot/calcite/rel/rules/PinotImplicitTableHintRule.java

Jackie-Jiang · 2024-09-30T18:41:59Z

...ery-planner/src/main/java/org/apache/pinot/calcite/rel/rules/PinotImplicitTableHintRule.java

+    }
+
+    if (TableNameBuilder.getTableTypeFromTableName(tableName) == null) {
+      tableName = TableNameBuilder.forType(TableType.OFFLINE).tableNameWithType(tableName);


(MAJOR) This is not robust, and can cause wrong behavior on real-time or hybrid table. We'll need to check both real-time and offline and apply hint when they match each other, or only one exists

Do you think we should apply the same check done in WorkerManager that verifies that there is at least one server that is fully replicated? I would suggest:

If the table is hybrid

And it is not fully replicated

If the query includes SET implicitColocateJoin=true, then we should fail.

If the query does not include SET implicitColocateJoin=true then we should not apply the optimization.

How complicated is this check? Are we going to replicate a lot of logic within WorkerManager?
I was thinking only apply the hint when both tables have the same partitionColumn, partitionFunctionName and numPartitions. Then I realized another issue: we need to know if a table exists to figure out whether it is either unpartitioned, or doesn't exist.

we need to know if a table exists

What do you mean? If the table doesn't exits we would have failed at validation time, right? Do you mean to actually have segments?

My concern here is that WorkerManager fails if there is at least one partition that is not fully replicated (see

pinot/pinot-query-planner/src/main/java/org/apache/pinot/query/routing/WorkerManager.java

Line 450 in 49126f2

Preconditions.checkState(!fullyReplicatedServers.isEmpty(),

). Therefore if we just compare partitionColumn, partitionFunctionName and numPartitions and the table is not fully replicated, we will end up failing at WorkerManager.

My suggestion is to modify WorkerManager to provide a method similar to getPartitionTableInfo that we can call from the rule. This method should check whether partition info is equal and if for each partition there is at least one server with a full copy of the partition. The main differences with current getPartitionTableInfo is that:

It cannot return PartitionTableInfo, given it is an internal class the rule don't care about.

It cannot call getTablePartitionInfo, which doesn't only get the info but also compares values on the hint with what is stored in the routing manager.

I've changed the code. Can you take a look to the new implementation that delegates on worker manager?

...ery-planner/src/main/java/org/apache/pinot/calcite/rel/rules/PinotImplicitTableHintRule.java

…tTableHintRule

…ableScan in PinotImplicitTableHintRule

pom.xml

Jackie-Jiang · 2024-10-01T17:57:20Z

pinot-spi/src/main/java/org/apache/pinot/spi/utils/CommonConstants.java

@@ -343,6 +343,8 @@ public static class Broker {
    public static final String CONFIG_OF_ENABLE_PARTITION_METADATA_MANAGER =
        "pinot.broker.enable.partition.metadata.manager";
    public static final boolean DEFAULT_ENABLE_PARTITION_METADATA_MANAGER = false;
+    public static final String IMPLICIT_COLOCATE_JOIN = "pinot.broker.multistage.implicit.colocate";


That is partition parallelism, i.e. how many threads to use in the following stage after partition is joined. When partition info is set, each partition is processed as a separate query in the leaf stage

pinot-query-planner/src/main/java/org/apache/pinot/query/QueryEnvironment.java

...ery-planner/src/main/java/org/apache/pinot/calcite/rel/rules/PinotImplicitTableHintRule.java

Jackie-Jiang · 2024-10-01T18:17:29Z

...ery-planner/src/main/java/org/apache/pinot/calcite/rel/rules/PinotImplicitTableHintRule.java

+    }
+
+    if (TableNameBuilder.getTableTypeFromTableName(tableName) == null) {
+      tableName = TableNameBuilder.forType(TableType.OFFLINE).tableNameWithType(tableName);


How complicated is this check? Are we going to replicate a lot of logic within WorkerManager?
I was thinking only apply the hint when both tables have the same partitionColumn, partitionFunctionName and numPartitions. Then I realized another issue: we need to know if a table exists to figure out whether it is either unpartitioned, or doesn't exist.

pinot-query-planner/src/main/java/org/apache/pinot/query/QueryEnvironment.java

gortiz · 2024-10-02T17:06:05Z

I've just pushed a couple of changes to delegate more logic on the WorkerManager. I didn't have time to actually verify it works as expected but I'm going to be traveling tomorrow and I wanted to be sure the changes are not lost.

…ints

Co-authored-by: Xiaotian (Jackie) Jiang <[email protected]>

…ints

pom.xml

Jackie-Jiang · 2024-10-11T00:25:51Z

pinot-spi/src/main/java/org/apache/pinot/spi/utils/CommonConstants.java

@@ -343,6 +343,8 @@ public static class Broker {
    public static final String CONFIG_OF_ENABLE_PARTITION_METADATA_MANAGER =
        "pinot.broker.enable.partition.metadata.manager";
    public static final boolean DEFAULT_ENABLE_PARTITION_METADATA_MANAGER = false;
+    public static final String IMPLICIT_COLOCATE_JOIN = "pinot.broker.multistage.implicit.colocate";


Something like AUTO_HINT_PARTITION_INFO or AUTO_APPLY_PARTITION_HINT?

...ery-planner/src/main/java/org/apache/pinot/calcite/rel/rules/PinotImplicitTableHintRule.java

Jackie-Jiang · 2024-10-11T07:41:41Z

...ery-planner/src/main/java/org/apache/pinot/calcite/rel/rules/PinotImplicitTableHintRule.java

+  private static TableOptions calculateTableOptions(
+      @Nullable RelHint relHint, TablePartitionInfo tablePartitionInfo, LogicalTableScan tableScan) {
+    if (relHint == null) {
+      return ImmutablePinotImplicitTableHintRule.TableOptions.builder()


I checked out the code but cannot find this class in IDE. Is this auto generated by the annotation framework?

This is the class that is autogenerated by immutables.

pinot-query-planner/src/main/java/org/apache/pinot/query/routing/WorkerManager.java

...ery-planner/src/main/java/org/apache/pinot/calcite/rel/rules/PinotImplicitTableHintRule.java

Jackie-Jiang · 2024-10-11T07:53:08Z

...ery-planner/src/main/java/org/apache/pinot/calcite/rel/rules/PinotImplicitTableHintRule.java

+    String tableName = RelToPlanNodeConverter.getTableNameFromTableScan(tableScan);
+
+    String offlineName = TableNameBuilder.forType(TableType.OFFLINE).tableNameWithType(tableName);
+    TablePartitionInfo offlineTpi = _workerManager.getTablePartitionInfo(offlineName);


One possible scenario is that both tables exist, but only one table has partition info. In that case we should return null instead

Shouldn't we just simplify this with WorkerManager.calculatePartitionTableInfo(tableName) now that we have that function?

I've changed this code to delegate on WorkerManager. The rule is now simpler and all logic (but merge) is in WorkerManager now.

…orkerManager

gortiz · 2024-10-11T12:39:42Z

@Jackie-Jiang Question: Should we also set pinot.broker.enable.partition.metadata.manager to true by default?

…erManager

…ints

Jackie-Jiang · 2024-10-11T18:44:05Z

@gortiz Yes! I think we can enable it by default

…manager enabled by default

Jackie-Jiang

Mostly good. Nice job extracting the common logic in WorkerManager

Jackie-Jiang · 2024-10-11T22:45:31Z

...ery-planner/src/main/java/org/apache/pinot/calcite/rel/rules/PinotImplicitTableHintRule.java

+  private static RelHint getTableOptionHint(LogicalTableScan tableScan) {
+    return tableScan.getHints().stream()
+        .filter(relHint -> relHint.hintName.equals(PinotHintOptions.TABLE_HINT_OPTIONS))
+        .findAny()


We want to pick the first hint that matches the name. The reason is that user might override the same hint multiple times, and the first one should be the closest one.
Suggest adding this as a util method in PinotHintStrategyTable

Jackie-Jiang · 2024-10-11T22:53:14Z

...ery-planner/src/main/java/org/apache/pinot/calcite/rel/rules/PinotImplicitTableHintRule.java

+    // there is a hint, check fill default data and obtain the partition parallelism if supplied
+    Map<String, String> kvOptions = relHint.kvOptions;
+
+    ImmutableTableOptions newTableOptions = ImmutableTableOptions.copyOf(implicitTableOptions);


Should we override here? I think we just want to validate if the explicit hint matches the implicit one, and always use the implicit one? Partition parallelism should always come from explicit hint

This code is here in case there is an explicit hint, in which case the explicit value provided by the writer wins. That is what is called override here. The base ImmutableTableOptions is the one calculated from the table and does not include partition information. Then for each dimension on TableOptions (key, function, etc) the implicit value is override by the explicit value provided, if any.

The code that enforces a specific value is in WorkerManager. We could move it here, but I think that can be done in another PR.

...ery-planner/src/main/java/org/apache/pinot/calcite/rel/rules/PinotImplicitTableHintRule.java

Jackie-Jiang · 2024-10-11T23:08:06Z

pinot-query-planner/src/main/java/org/apache/pinot/query/QueryEnvironment.java

+    }
+    switch (useImplicitColocatedOptionValue.toLowerCase()) {
+      case "true":
+        Objects.requireNonNull(workerManager, "WorkerManager is required for implicit colocated join");


Is it possible that we run into this query path without the worker manager being set? I still think this path should be handled the same way as instance level setting. Whether worker manager is set or not should be orthogonal to whether the setting is instance level or query level.

Now that worker manager is enabled by default is more difficult, but if pinot.broker.enable.partition.metadata.manager is set to false and then the query includes set implicitColocateJoin=true;, then we fail this check.

It is just a matter of failing fast. The writer asked to use this feature and it cannot be used because config indicates that worker manager should not be instantiated. We can just ignore the writer request, but given this is not a hint but an option, I think it is more elegant to fail with a correct message.

Here the worker manager is read from the environment config, so whether it is null is not decided by this config, but purely based on the code path that initialized the QueryEnvironment

Sure. WorkerManager will be null or not depending on how QueryEnvironment is initialized.

But inferPartitionHint (the new name of useImplicitColocatedOptionValue) is decided by the query option. What I'm doing here is to fail if WorkerManager was initialized to null AND the user is explicitly asking to inferPartitionHint. I think that is better than the alternative, which is to do not apply infer partition hint when explicitly asked because the worker manager wasn't enabled at startup time.

If I understand the intention correctly, we want to fail the planning if partitionMetadataManager is unavailable instead of workerManager. workerManager can be null in certain query path independent of the value of partitionMetadataManager. We need to ensure query with option never hits that code path

pinot-query-planner/src/main/java/org/apache/pinot/query/routing/WorkerManager.java

Jackie-Jiang · 2024-10-11T23:21:43Z

pinot-spi/src/main/java/org/apache/pinot/spi/utils/CommonConstants.java

@@ -343,6 +343,8 @@ public static class Broker {
    public static final String CONFIG_OF_ENABLE_PARTITION_METADATA_MANAGER =
        "pinot.broker.enable.partition.metadata.manager";
    public static final boolean DEFAULT_ENABLE_PARTITION_METADATA_MANAGER = false;
+    public static final String IMPLICIT_COLOCATE_JOIN = "pinot.broker.multistage.implicit.colocate";


Remember to change this

Jackie-Jiang

LGTM

...ker/src/main/java/org/apache/pinot/broker/requesthandler/MultiStageBrokerRequestHandler.java

pinot-query-planner/src/main/java/org/apache/pinot/query/QueryEnvironment.java

pinot-spi/src/main/java/org/apache/pinot/spi/utils/CommonConstants.java

pinot-query-planner/src/main/java/org/apache/pinot/calcite/rel/hint/PinotHintStrategyTable.java

pinot-query-planner/src/main/java/org/apache/pinot/query/QueryEnvironment.java

Jackie-Jiang · 2024-10-15T18:21:25Z

pinot-query-planner/src/main/java/org/apache/pinot/query/QueryEnvironment.java

+    }
+    switch (useImplicitColocatedOptionValue.toLowerCase()) {
+      case "true":
+        Objects.requireNonNull(workerManager, "WorkerManager is required for implicit colocated join");


Here the worker manager is read from the environment config, so whether it is null is not decided by this config, but purely based on the code path that initialized the QueryEnvironment

…ints

gortiz added the multi-stage Related to the multi-stage query engine label Sep 5, 2024

gortiz requested review from Jackie-Jiang and yashmayya September 5, 2024 15:39

gortiz added 2 commits September 9, 2024 10:03

colocated-without-hints: First commit with the proposed code

656b0ce

colocated-without-hints: Adds the ability to enable/disable this opti…

860437b

…mization at startup and query time

gortiz force-pushed the colocated-without-hints branch from 400675a to 860437b Compare September 9, 2024 08:03

gortiz mentioned this pull request Sep 10, 2024

[Multi-stage] Support lookup join #13966

Merged

gortiz added 2 commits September 18, 2024 11:53

colocated-without-hints: Add a default value for QueryEnvironment.Con…

dec74d3

…fig.useImplicitColocatedByDefault

multi-stage-explain: Add a @nullable because it is needed in tests

c674900

gortiz changed the title ~~colocated-without-hints: First commit with the proposed code~~ colocated-without-hints Sep 20, 2024

vrajat reviewed Sep 24, 2024

View reviewed changes

...ery-planner/src/main/java/org/apache/pinot/calcite/rel/rules/PinotImplicitTableHintRule.java Outdated Show resolved Hide resolved

gortiz mentioned this pull request Sep 24, 2024

[Multi-stage] Clean up unnecessary checks in rules #14066

Merged

gortiz added 2 commits September 24, 2024 14:05

Merge branch 'master' into colocated-without-hints

7bf5a00

Merge branch 'master' into colocated-without-hints

83a9e4b

Jackie-Jiang reviewed Sep 30, 2024

View reviewed changes

gortiz added 4 commits October 1, 2024 11:43

Merge branch 'master' into colocated-without-hints

c58db84

colocated-without-hints: disable formatter in a fluent chain call

0a07920

colocated-without-hints: ignore PARTITION_PARALLELISM in PinotImplici…

125be2c

…tTableHintRule

colocated-without-hints: use RelToPlanNodeConverter.getTableNameFromT…

5a2de52

…ableScan in PinotImplicitTableHintRule

Jackie-Jiang reviewed Oct 1, 2024

View reviewed changes

colocated-without-hints: Improve useImplicitColocated usage

e3f2096

gortiz force-pushed the colocated-without-hints branch from 97c4621 to e3f2096 Compare October 2, 2024 17:03

Merge remote-tracking branch 'origin/master' into colocated-without-h…

ff627b3

…ints

gortiz mentioned this pull request Oct 8, 2024

Declare annotation processors as compiler plugin config #14185

Merged

gortiz added 2 commits October 9, 2024 09:12

Rewrite WorkerManager to be closer to the previous version

bbf3e5e

Merge remote-tracking branch 'origin/master' into colocated-without-h…

06e8c1b

…ints

gortiz and others added 3 commits October 10, 2024 14:30

Update pom.xml

bdca363

Co-authored-by: Xiaotian (Jackie) Jiang <[email protected]>

Merge remote-tracking branch 'origin/master' into colocated-without-h…

f16eecf

…ints

Declare immutable processor as an actual annotation processor

598b17e

gortiz force-pushed the colocated-without-hints branch from 99cf25a to 598b17e Compare October 10, 2024 12:47

Refactor a difficult to read method

75d077f

Jackie-Jiang reviewed Oct 11, 2024

View reviewed changes

gortiz added 4 commits October 11, 2024 08:32

Rollback the immutables bom import

9fda5de

Removed PartitionTableFinder, unused now that we directly depend on W…

047500d

…orkerManager

Removed unneeded precondition

3743d73

Support table names with type in getTablePartitionInfo

14e26f1

gortiz added 2 commits October 11, 2024 09:53

Simplify PinotImplicitTableHintRule by delegating even more into Work…

977fa16

…erManager

Merge remote-tracking branch 'origin/master' into colocated-without-h…

172f605

…ints

gortiz added 2 commits October 11, 2024 16:13

colocated-without-hints: add license header

c64095f

colocated-without-hints: turn pinot.broker.enable.partition.metadata.…

24036a9

…manager enabled by default

gortiz force-pushed the colocated-without-hints branch from 8a09ca2 to 24036a9 Compare October 11, 2024 19:14

Jackie-Jiang added enhancement release-notes Referenced by PRs that need attention when compiling the next release notes Configuration Config changes (addition/deletion/change in behavior) labels Oct 11, 2024

Jackie-Jiang reviewed Oct 11, 2024

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colocated-without-hints: Apply suggestions on PR

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Jackie-Jiang approved these changes Oct 15, 2024

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gortiz added 3 commits October 16, 2024 08:18

colocated-without-hints: Rename getHint method

1a13516

colocated-without-hints: rename hint to inferPartitionHint

460a8e5

Merge remote-tracking branch 'origin/master' into colocated-without-h…

8512fd2

…ints

gortiz merged commit 77627ba into apache:master Oct 16, 2024
23 checks passed

gortiz deleted the colocated-without-hints branch October 25, 2024 09:26

colocated-without-hints #13943

colocated-without-hints #13943

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gortiz commented Sep 5, 2024 • edited Loading

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gortiz commented Sep 5, 2024 •

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