Add Flink Pinot connector #8233

yupeng9 · 2022-02-20T17:21:22Z

Description

Add a Flink connector to write data to Pinot directly. This is useful for backfilling or bootstrapping tables,
including the upsert tables. You can read more about the motivation and design in this design proposal.

Upgrade Notes

New plugins of Flink connector added

yupeng9 · 2022-02-20T17:26:17Z

@walterddr please review

codecov-commenter · 2022-02-20T17:54:20Z

Codecov Report

Merging #8233 (e0cd7b2) into master (46ed731) will decrease coverage by 1.32%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #8233      +/-   ##
============================================
- Coverage     70.83%   69.51%   -1.33%     
  Complexity     4245     4245              
============================================
  Files          1631     1631              
  Lines         85462    85490      +28     
  Branches      12877    12878       +1     
============================================
- Hits          60539    59427    -1112     
- Misses        20746    21923    +1177     
+ Partials       4177     4140      -37

Flag	Coverage Δ
integration1	`?`
integration2	`27.57% <ø> (-0.04%)`	⬇️
unittests1	`66.97% <ø> (+0.01%)`	⬆️
unittests2	`14.17% <ø> (+0.01%)`	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...pinot/minion/exception/TaskCancelledException.java	`0.00% <0.00%> (-100.00%)`	⬇️
...nverttorawindex/ConvertToRawIndexTaskExecutor.java	`0.00% <0.00%> (-100.00%)`	⬇️
...e/pinot/common/minion/MergeRollupTaskMetadata.java	`0.00% <0.00%> (-94.74%)`	⬇️
...plugin/segmentuploader/SegmentUploaderDefault.java	`0.00% <0.00%> (-87.10%)`	⬇️
.../transform/function/MapValueTransformFunction.java	`0.00% <0.00%> (-85.30%)`	⬇️
...ot/common/messages/RoutingTableRebuildMessage.java	`0.00% <0.00%> (-81.82%)`	⬇️
...data/manager/realtime/DefaultSegmentCommitter.java	`0.00% <0.00%> (-80.00%)`	⬇️
...verttorawindex/ConvertToRawIndexTaskGenerator.java	`5.45% <0.00%> (-80.00%)`	⬇️
...ache/pinot/common/lineage/SegmentLineageUtils.java	`22.22% <0.00%> (-77.78%)`	⬇️
...ore/startree/executor/StarTreeGroupByExecutor.java	`0.00% <0.00%> (-77.78%)`	⬇️
... and 107 more

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xiangfu0 · 2022-02-23T00:57:38Z

...connector/src/test/java/org/apache/pinot/connector/flink/http/PinotControllerClientTest.java

+    Response response = mock(Response.class);
+    MultivaluedMap<String, Object> headers = getRequestHeadersToPinot();
+    String expectedFullURL = "http://localhost:9000/tables/demand?type=realtime";
+    final Map<String, Object> resEntity = new HashMap<>() {


This seems not compilable for jdk8:

Error: Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.8.0:testCompile (default-testCompile) on project flink-pinot-sink: Compilation failure Error: /home/runner/work/pinot/pinot/pinot-connectors/pinot-flink-connector/src/test/java/org/apache/pinot/connector/flink/http/PinotControllerClientTest.java:[124,53] error: cannot infer type arguments for HashMap<K,V> Error: reason: cannot use '<>' with anonymous inner classes Error: where K,V are type-variables: Error: K extends Object declared in class HashMap Error: V extends Object declared in class HashMap Error: -> [Help 1]

I thought we dropped jdk8 support? not yet?

btw, this usage HashMap<> is all over the codebase

xiangfu0 · 2022-02-23T00:58:01Z

pinot-connectors/pinot-flink-connector/src/test/resources/fixtures/pinotTableSchema.json

+    "transformFunction": null
+  },
+  "primaryKeyColumns" : [ "demand_uuid" ]
+}


nit: new line, same for other files

xiangfu0 · 2022-02-23T01:08:37Z

...ink-connector/src/main/java/org/apache/pinot/connector/flink/http/PinotControllerClient.java

+
+
+/** This file is partially copied from RTAUMS gateway package */
+public class PinotControllerClient extends HttpClient {


I feel this is a very helpful Client.

Just drop my random thought here:
Shall we rename this to PinotAdminClient and move it to the pinot-java-client module then import it back?

cc: @KKcorps @Jackie-Jiang

TBH we already have something very similar but is only used in test: ControllerTestUtils. we can probably consider a prime version of it

yup, I'm fine with consolidating/extracting the client into a more reusable lib. But I think it's better to do this in a later PR, to reduce the scope of this PR, which is already quite large.

Sounds good, can you create a new issue for consolidating the reusable utils with potential candidates that can be merged.

sure. tracked at #8246

xiangfu0 · 2022-02-23T01:21:29Z

...rs/pinot-flink-connector/src/main/java/org/apache/pinot/connector/flink/http/HttpClient.java

+
+
+/** This is copied from {@link HttpClient} in RTA-UMS project. */
+public abstract class HttpClient {


Do we really need this abstract? I feel this class is more like static util methods if making _httpClient static.
Also, we have implementations at AbstractBaseAdminCommand in pinot-tools for the same purpose, you can also consider moving this logic to pinot-common :p

yeah, it's just some helper methods that can be reused by subclasses. For example, if we want to add other clients to broker/server etc

walterddr · 2022-02-23T04:32:41Z

this looks super great. thanks @yupeng9 for the contribution. I will take a look this weekend thoroughly

yupeng9

addressed comments

yupeng9 · 2022-02-23T22:01:24Z

...connector/src/test/java/org/apache/pinot/connector/flink/http/PinotControllerClientTest.java

+    Response response = mock(Response.class);
+    MultivaluedMap<String, Object> headers = getRequestHeadersToPinot();
+    String expectedFullURL = "http://localhost:9000/tables/demand?type=realtime";
+    final Map<String, Object> resEntity = new HashMap<>() {


btw, this usage HashMap<> is all over the codebase

walterddr

thanks @yupeng9 for the contribution. I briefly looked over most of the implementions and found some issues. please kindly take a look.

Since this is largely based on my previous POC: https://github.com/walterddr/flink-pinot-sink my review might've been biased. it would be great if @npawar can also take another look at the segment write/upload logic.

thanks

walterddr · 2022-02-26T16:13:06Z

...connector/src/main/java/org/apache/pinot/connector/flink/common/PinotMapRecordConverter.java

+import org.apache.pinot.spi.data.readers.GenericRow;
+
+
+public class PinotMapRecordConverter implements RecordConverter<Map> {


Suggested change

public class PinotMapRecordConverter implements RecordConverter<Map> {

public class PinotMapRecordConverter implements RecordConverter<Map<String, Object>> {

to avoid unchecked casts.

walterddr · 2022-02-26T16:14:11Z

...link-connector/src/main/java/org/apache/pinot/connector/flink/sink/FlinkSegmentUploader.java

+  private BatchIngestionConfig _batchIngestionConfig;
+
+  public FlinkSegmentUploader(int indexOfSubtask) {
+    _indexOfSubtask = indexOfSubtask;


indexOfSubtask is not used in uploaded. I think it only matters in segment writer.

walterddr · 2022-02-26T16:15:29Z

...t-flink-connector/src/main/java/org/apache/pinot/connector/flink/sink/PinotSinkFunction.java

+ * data and also share that data with checkpoint state. Instead it uses an internal buffer within
+ * PinotSinkFunction for checkpoint.
+ *
+ * <p>This should change once we introduce FlinkPinotSegmentWriter


this javadoc is outdated.

walterddr · 2022-02-26T16:17:00Z

...t-flink-connector/src/main/java/org/apache/pinot/connector/flink/sink/PinotSinkFunction.java

+    // TODO improve segment uploader to use in-memory buffer then flush to tar file.
+    _segmentWriter = new FlinkSegmentWriter(indexOfSubtask, getRuntimeContext().getMetricGroup());
+    _segmentWriter.init(_tableConfig, _schema);
+    // TODO improve segment uploader to take in-memory tar
+    // TODO launch segment uploader as separate thread for uploading (non-blocking?)


clean up TODOs.

walterddr · 2022-02-26T16:20:35Z

...t-flink-connector/src/main/java/org/apache/pinot/connector/flink/sink/PinotSinkFunction.java

+    // ...
+  }
+
+  private void flush()


potential race condition when snapshot and invoke both calls flush?

Is it possible to have a race conditon? Only invoke can call it, since snapshotState is not used in batch processing.

in this case we can just throw an exception? rather than invoking flush in snapshotState? if it is not use anyway.

walterddr · 2022-02-26T16:24:44Z

...-flink-connector/src/main/java/org/apache/pinot/connector/flink/sink/FlinkSegmentWriter.java

+    _reusableRecord = new GenericData.Record(_avroSchema);
+
+    // Create tmp dir
+    // TODO staging Dir also need to be subtask separated otherwise there will be write conflict.


clean up TODO

walterddr · 2022-02-26T16:26:15Z

...-flink-connector/src/main/java/org/apache/pinot/connector/flink/sink/FlinkSegmentWriter.java

+  private transient Counter _processedRecords;
+  private transient volatile long _lastRecordProcessingTimeMs = 0;
+
+  public FlinkSegmentWriter(int indexOfSubtask, MetricGroup metricGrp) {


nit: Refactor common code between FlinkSegmentWriter and FileBaseSegmentWriter but can be done in separate PR

walterddr · 2022-02-26T16:36:43Z

...rs/pinot-flink-connector/src/main/java/org/apache/pinot/connector/flink/http/HttpClient.java

@@ -0,0 +1,130 @@
+/**


I might've been wrong but I dont see the entire package of org.apache.pinot.connector.flink.http used in anywhere outside of this package.

is this module relevant to the flink connector PR at all? or this is simply used for integration/e2e test as an easy util?

i've deleted this entire module and tests runs just fine, so if not relevant I suggest we delete this module

It's used in the quickstart to show how to use REST API to fetch the schema and table config to config the connector. Otherwise developer needs to manually craft those configs.

Also, you can take a look at PinotConnectionUtils for the useful config management.

yes, but it is not related to the flink connector. for the sake of this PR's scope. i would suggest we drop it and add in separate PR.

mainly for the following reasons.

it doesn't relate to flink connector, at first I thought we are utilizing http to directly ingest into pinot via some sort of REST API. but if it is not the case it shouldn't be part of flink-pinot connector but rather in pinot-tools.

@xiangfu0 also think we can refactor this part out later. doesn't make sense to get this in an refactor it out if it is not part of the critical path

there's already one util in test call ControllerUtils that can be used for demonstration purpose.

Not saying it is not useful, but it would be much easier to address it separately.

Not really. I think this is an integral part to show how the connector is used as in QuickStart, without it I don't think the connector is complete. It doesn't make sense to expect developers to manually create the Schema as well as TableConfig, not to mention several configurations decoration needed in the PinotConnectionUtils .

Xiang's point is that in later PR we can refactor this part of code with a reusable client lib. However, from the connector's user perspective, it doesn't change the way of using the connector.

Makes sense?

hmm. I must have missed something. here is what I did:

deleted the entire folder under src/main/java/org/apache/pinot/connector/flink/http.

run mvn test -pl pinot-connectors/pinot-flink-connector

everything runs pass. this proves that the http folder has nothing to do with this PR. yes?

did you forget to add a Quickstart? I don't see a quickstart in this PR or any changes outside of the pinot-flink-connector module. (and if so, let's add it in a separate PR i suggest)

hmm , I see. This file is filtered by one of the .gitignore rules. Renamed it and pushed again.

walterddr · 2022-02-26T16:40:19Z

pinot-connectors/pinot-flink-connector/pom.xml

+    <version>0.10.0-SNAPSHOT</version>
+    <relativePath>..</relativePath>
+  </parent>
+  <artifactId>flink-pinot-sink</artifactId>


Suggested change

<artifactId>flink-pinot-sink</artifactId>

<artifactId>pinot-flink-connector</artifactId>

walterddr · 2022-02-26T16:41:31Z

pinot-connectors/pinot-flink-connector/pom.xml

+    <dependency>
+      <groupId>org.mockito</groupId>
+      <artifactId>mockito-core</artifactId>
+    </dependency>
+    <dependency>
+      <groupId>org.apache.flink</groupId>
+      <artifactId>flink-clients_${scala.version}</artifactId>
+      <version>${flink.version}</version>
+    </dependency>


add <scope>test</scope> to these 2 dependencies.

yupeng9

@walterddr Thanks for the review. Addressed the comments PTAL.

yupeng9 · 2022-02-27T00:15:49Z

...rs/pinot-flink-connector/src/main/java/org/apache/pinot/connector/flink/http/HttpClient.java

@@ -0,0 +1,130 @@
+/**


It's used in the quickstart to show how to use REST API to fetch the schema and table config to config the connector. Otherwise developer needs to manually craft those configs.

Also, you can take a look at PinotConnectionUtils for the useful config management.

yupeng9 · 2022-02-27T00:21:13Z

...t-flink-connector/src/main/java/org/apache/pinot/connector/flink/sink/PinotSinkFunction.java

+    // ...
+  }
+
+  private void flush()


Is it possible to have a race conditon? Only invoke can call it, since snapshotState is not used in batch processing.

npawar · 2022-03-03T01:18:49Z

...-flink-connector/src/main/java/org/apache/pinot/connector/flink/sink/FlinkSegmentWriter.java

+ */
+@SuppressWarnings("NullAway")
+@NotThreadSafe
+public class FlinkSegmentWriter implements SegmentWriter {


why was creating a Flink specific impl of SegmentWriter needed? Why couldn't we just use the FileBasedSegmentWriter? most of the code looks the same, with some additional metadata like seqId and rowCount etc. Aren't those concepts generic enough that we could just add them to FileBasedSegmentWriter and enhance it?

We could with a later refactoring. I think one of the reasons is that we don't have an abstract class of SegmentWriter that allows customization like in this Flink case. Also, initially, this connector was not planned to add to Pinot repo, but Flink repo, which means this connector has to depend on the published pinot library only.

Similar to the consolidation with the client utils, I think we can later consolidate the SegmentWriter, after they are in the same repo.

the Sink should have been in Flink, but the Writer should have always been in Pinot, and it should have been from the impls offered. If by consolidate later, you mean soon enough, I'm fine with starting with this. But this can easily get deprioritized and fall off the plate once it is non-blocking :) And the code really is identical, except a few tweaks here and there which the default impl can benefit from anyway..

That's fair. Let me address this in a follow-up PR, and it shouldn't be hard. But I try not to modify other modules in this PR, so it'll be a pure module addition.

...-flink-connector/src/main/java/org/apache/pinot/connector/flink/sink/FlinkSegmentWriter.java

npawar · 2022-03-03T01:50:35Z

...link-connector/src/main/java/org/apache/pinot/connector/flink/sink/FlinkSegmentUploader.java

+
+
+/**
+ * Default implementation of {@link SegmentUploader} with support for all push modes The configs for


javadoc needs to be updated

npawar · 2022-03-03T01:53:19Z

...-flink-connector/src/main/java/org/apache/pinot/connector/flink/sink/FlinkSegmentWriter.java

+import org.slf4j.LoggerFactory;
+
+
+/**


this is the javadoc from FileBasedSegmentWriter. call out here why FlinkSegmentWriter needed to be added, why it is different from FileBased, and any todos to unify the 2. imo, FlinkSegmentWriter should just extend the FileBasedSegmentWriter for the flink metrics related special casing. Everything else should get folded into FileBased impl.

npawar · 2022-03-03T01:56:40Z

...link-connector/src/main/java/org/apache/pinot/connector/flink/sink/FlinkSegmentUploader.java

+ * Default implementation of {@link SegmentUploader} with support for all push modes The configs for
+ * push are fetched from batchConfigMaps of tableConfig
+ */
+@SuppressWarnings("NullAway")


This class seems exactly identical to SegmentUploaderDefault. Can we just use that one?

npawar · 2022-03-03T02:02:39Z

...t-flink-connector/src/main/java/org/apache/pinot/connector/flink/sink/PinotSinkFunction.java

+    } catch (InterruptedException e) {
+      _executor.shutdownNow();
+    }
+    _segmentWriter.close();


do this in finally?

pinot-connectors/pinot-flink-connector/README.md

npawar · 2022-03-03T02:11:48Z

...connector/src/main/java/org/apache/pinot/connector/flink/common/PinotRowRecordConverter.java

+  public PinotRowRecordConverter(RowTypeInfo rowTypeInfo) {
+    _rowTypeInfo = rowTypeInfo;
+    _fieldNames = rowTypeInfo.getFieldNames();
+    _fieldTypes = rowTypeInfo.getFieldTypes();


this is unused. remove?

npawar · 2022-03-03T02:16:04Z

...connector/src/main/java/org/apache/pinot/connector/flink/common/PinotMapRecordConverter.java

+import org.apache.pinot.spi.data.readers.GenericRow;
+
+
+public class PinotMapRecordConverter implements RecordConverter<Map<String, Object>> {


(optional) this name is not the very intuitive..
How about PinotGenericRowConverter as interface, and MapGenericRowConverter and FlinkRowGenericRowConverter as impls?

npawar · 2022-03-03T02:20:55Z

...rs/pinot-flink-connector/src/main/java/org/apache/pinot/connector/flink/FlinkQuickStart.java

+ * the offline table of all Starbucks store locations in US, and then run this quick start to populate other Starbucks
+ * stores in the rest of the world.
+ */
+public final class FlinkQuickStart {


can this just be in pinot-tools with the rest of the Quickstarts?

not sure. pinot-tools doesn't have dependency on connectors. actually we do not build connectors for the core

npawar · 2022-03-03T02:27:56Z

...ors/pinot-flink-connector/src/test/java/org/apache/pinot/connector/flink/util/TestUtils.java

+import org.testng.Assert;
+
+
+public final class TestUtils {


can the integration test move to pinot-integration-tests? 1. it should ideally be there with all others 2. you won't have to write this util class just for flink connector, as it's already there for use in ITs

pinot-integration-tests does not have dependency on connectors.

it is fine to add the test dependency for connectors to pinot-integration-tests.. we add dependency of required plugin/connector there anyway for the test. fine if this is addressed in next PR

hmm, the integration test in the spark connector is also in the spark module. I'm fine with the suggestion, though it'll make connectors build non-optional in Pinot project build. What do you think, @xiangfu0

...ors/pinot-flink-connector/src/test/java/org/apache/pinot/connector/flink/util/TestUtils.java

pinot-connectors/pinot-flink-connector/src/test/resources/fixtures/pinotTableSchema.json

yupeng9

@npawar thanks for the review. comments addressed.

pinot-connectors/pinot-flink-connector/README.md

yupeng9 · 2022-03-03T23:19:22Z

...rs/pinot-flink-connector/src/main/java/org/apache/pinot/connector/flink/FlinkQuickStart.java

+ * the offline table of all Starbucks store locations in US, and then run this quick start to populate other Starbucks
+ * stores in the rest of the world.
+ */
+public final class FlinkQuickStart {


not sure. pinot-tools doesn't have dependency on connectors. actually we do not build connectors for the core

...-flink-connector/src/main/java/org/apache/pinot/connector/flink/sink/FlinkSegmentWriter.java

yupeng9 · 2022-03-04T04:02:52Z

...ors/pinot-flink-connector/src/test/java/org/apache/pinot/connector/flink/util/TestUtils.java

+import org.testng.Assert;
+
+
+public final class TestUtils {


pinot-integration-tests does not have dependency on connectors.

...ors/pinot-flink-connector/src/test/java/org/apache/pinot/connector/flink/util/TestUtils.java

npawar · 2022-03-06T23:47:43Z

pinot-connectors/pinot-flink-connector/src/test/resources/fixtures/pinotTableSchema.json

+      "transformFunction": null
+    }
+  ],
+  "dateTimeFieldSpecs": [


how is this not failing with 2 dateTimeFieldSpecs !

oh, it's just a dummy file to test the RPC calls

yupeng9 requested a review from xiangfu0 February 20, 2022 17:21

xiangfu0 reviewed Feb 23, 2022

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yupeng9 commented Feb 23, 2022

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yupeng9 mentioned this pull request Feb 24, 2022

Java client for Controller/Broker/Server REST APIs #8246

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xiangfu0 approved these changes Feb 26, 2022

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walterddr requested changes Feb 26, 2022

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yupeng9 commented Feb 27, 2022

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Jackie-Jiang added the release-notes Referenced by PRs that need attention when compiling the next release notes label Feb 28, 2022

npawar reviewed Mar 3, 2022

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yupeng9 commented Mar 4, 2022

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yupeng9 added 10 commits March 4, 2022 08:28

Add Flink Pinot connector

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yupeng9 force-pushed the flink-connector branch from 8c6b350 to dc28b99 Compare March 4, 2022 16:29

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yupeng9 merged commit e41d86b into apache:master Mar 7, 2022



		/** This file is partially copied from RTAUMS gateway package */
		public class PinotControllerClient extends HttpClient {



		/** This is copied from {@link HttpClient} in RTA-UMS project. */
		public abstract class HttpClient {

		import org.apache.pinot.spi.data.readers.GenericRow;


		public class PinotMapRecordConverter implements RecordConverter<Map> {

	<artifactId>flink-pinot-sink</artifactId>
	<artifactId>pinot-flink-connector</artifactId>



		/**
		* Default implementation of {@link SegmentUploader} with support for all push modes The configs for

Add Flink Pinot connector #8233

Add Flink Pinot connector #8233

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yupeng9 commented Feb 20, 2022

Description

Upgrade Notes

yupeng9 commented Feb 20, 2022

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