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Posted to issues@flink.apache.org by GitBox <gi...@apache.org> on 2020/05/08 10:08:17 UTC
[GitHub] [flink] wsry opened a new pull request #12034: [FLINK-17568][checkpointing] Fix the issue that task may consume input data after checkpoint barrier before checkpoint is performed for unaligned checkpoint
wsry opened a new pull request #12034:
URL: https://github.com/apache/flink/pull/12034
## What is the purpose of the change
For unaligned checkpoint, task may consume data after the checkpoint barrier before performing checkpoint which lead to consumption of duplicated data and corruption of data stream.
More specifically, when the Netty thread notifies the checkpoint barrier for the first time and enqueue a checkpointing task in the mailbox, the task thread may still in data consumption loop and if it reads a new checkpoint barrier from another channel it will not return to the mailbox and instead it will continue to read data until a all data consumed or we have a full record, meanwhile, the data after checkpoint barrier may be read and consumed which lead to inconsistency.
This PR tries to fix the problem.
## Brief change log
- Return to mailbox after receiving a checkpoint barrier.
## Verifying this change
This change is already covered by existing tests.
## Does this pull request potentially affect one of the following parts:
- Dependencies (does it add or upgrade a dependency): (yes / **no**)
- The public API, i.e., is any changed class annotated with `@Public(Evolving)`: (yes / **no**)
- The serializers: (yes / **no** / don't know)
- The runtime per-record code paths (performance sensitive): (yes / **no** / don't know)
- Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Kubernetes/Yarn/Mesos, ZooKeeper: (**yes** / no / don't know)
- The S3 file system connector: (yes / **no** / don't know)
## Documentation
- Does this pull request introduce a new feature? (yes / **no**)
- If yes, how is the feature documented? (**not applicable** / docs / JavaDocs / not documented)
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[GitHub] [flink] flinkbot edited a comment on pull request #12034: [FLINK-17568][checkpointing] Fix the issue that task may consume input data after checkpoint barrier before checkpoint is performed for unaligned checkpoint
Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #12034:
URL: https://github.com/apache/flink/pull/12034#issuecomment-625870609
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## CI report:
* 6f7d51f627e181949e1311f56897a393471abd06 Azure: [CANCELED](https://dev.azure.com/apache-flink/98463496-1af2-4620-8eab-a2ecc1a2e6fe/_build/results?buildId=827)
* a29ceddd394d563fe95f166a425380f0452ccd71 UNKNOWN
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[GitHub] [flink] wsry commented on pull request #12034: [FLINK-17568][checkpointing] Fix the issue that task may consume input data after checkpoint barrier before checkpoint is performed for unaligned checkpoint
Posted by GitBox <gi...@apache.org>.
wsry commented on pull request #12034:
URL: https://github.com/apache/flink/pull/12034#issuecomment-625883216
@pnowojski I have added a unit test to ```StreamTaskNetworkInputTest```, could you please take a look and see whether I understand correctly and the test case verifies what you want to verify?
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[GitHub] [flink] wsry commented on pull request #12034: [FLINK-17568][checkpointing] Fix the issue that task may consume input data after checkpoint barrier before checkpoint is performed for unaligned checkpoint
Posted by GitBox <gi...@apache.org>.
wsry commented on pull request #12034:
URL: https://github.com/apache/flink/pull/12034#issuecomment-626134055
@pnowojski I have updated the PR according to the review comments.
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[GitHub] [flink] flinkbot edited a comment on pull request #12034: [FLINK-17568][checkpointing] Fix the issue that task may consume input data after checkpoint barrier before checkpoint is performed for unaligned checkpoint
Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #12034:
URL: https://github.com/apache/flink/pull/12034#issuecomment-625870609
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## CI report:
* a29ceddd394d563fe95f166a425380f0452ccd71 Azure: [FAILURE](https://dev.azure.com/apache-flink/98463496-1af2-4620-8eab-a2ecc1a2e6fe/_build/results?buildId=839)
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[GitHub] [flink] wsry commented on pull request #12034: [FLINK-17568][checkpointing] Fix the issue that task may consume input data after checkpoint barrier before checkpoint is performed for unaligned checkpoint
Posted by GitBox <gi...@apache.org>.
wsry commented on pull request #12034:
URL: https://github.com/apache/flink/pull/12034#issuecomment-626102934
@pnowojski
I found that the changed behavior of CheckpointedInputGate fails CheckpointBarrierTrackerTest and CreditBasedCheckpointBarrierAlignerTest. I have fixed them accordingly.
Besides, I found that CheckpointBarrierAlignerTestBase#testMultiChannelSkippingCheckpoints is a duplication of CheckpointBarrierAlignerTestBase#testMultiChannelJumpingOverCheckpoint, so I removed CheckpointBarrierAlignerTestBase#testMultiChannelSkippingCheckpoints in a hotfix commit.
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[GitHub] [flink] flinkbot edited a comment on pull request #12034: [FLINK-17568][checkpointing] Fix the issue that task may consume input data after checkpoint barrier before checkpoint is performed for unaligned checkpoint
Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #12034:
URL: https://github.com/apache/flink/pull/12034#issuecomment-625870609
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## CI report:
* a29ceddd394d563fe95f166a425380f0452ccd71 Azure: [FAILURE](https://dev.azure.com/apache-flink/98463496-1af2-4620-8eab-a2ecc1a2e6fe/_build/results?buildId=839)
* f00114189cdddaa5a46148738e55d85854df97ab UNKNOWN
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[GitHub] [flink] flinkbot edited a comment on pull request #12034: [FLINK-17568][checkpointing] Fix the issue that task may consume input data after checkpoint barrier before checkpoint is performed for unaligned checkpoint
Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #12034:
URL: https://github.com/apache/flink/pull/12034#issuecomment-625870609
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## CI report:
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[GitHub] [flink] pnowojski commented on a change in pull request #12034: [FLINK-17568][checkpointing] Fix the issue that task may consume input data after checkpoint barrier before checkpoint is performed for unaligned checkpoint
Posted by GitBox <gi...@apache.org>.
pnowojski commented on a change in pull request #12034:
URL: https://github.com/apache/flink/pull/12034#discussion_r422469341
##########
File path: flink-streaming-java/src/test/java/org/apache/flink/streaming/runtime/io/StreamTaskNetworkInputTest.java
##########
@@ -74,29 +77,31 @@ public void tearDown() throws Exception {
@Test
public void testIsAvailableWithBufferedDataInDeserializer() throws Exception {
- BufferBuilder bufferBuilder = BufferBuilderTestUtils.createEmptyBufferBuilder(PAGE_SIZE);
- BufferConsumer bufferConsumer = bufferBuilder.createBufferConsumer();
-
- serializeRecord(42L, bufferBuilder);
- serializeRecord(44L, bufferBuilder);
-
- List<BufferOrEvent> buffers = Collections.singletonList(new BufferOrEvent(bufferConsumer.build(), 0, false));
+ List<BufferOrEvent> buffers = Collections.singletonList(createDataBuffer());
VerifyRecordsDataOutput output = new VerifyRecordsDataOutput<>();
- StreamTaskNetworkInput input = new StreamTaskNetworkInput<>(
- new CheckpointedInputGate(
- new MockInputGate(1, buffers, false),
- new CheckpointBarrierTracker(1, new DummyCheckpointInvokable())),
- LongSerializer.INSTANCE,
- ioManager,
- new StatusWatermarkValve(1, output),
- 0);
+ StreamTaskNetworkInput input = createStreamTaskNetworkInput(buffers, output);
assertHasNextElement(input, output);
assertHasNextElement(input, output);
assertEquals(2, output.getNumberOfEmittedRecords());
}
+ @Test
Review comment:
nit: add an explanation comment:
```
InputGate on CheckpointBarrier can enqueue a mailbox action to execute and StreamTaskNetworkInput must
allow this action to execute before processing a following record.
```
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[GitHub] [flink] flinkbot edited a comment on pull request #12034: [FLINK-17568][checkpointing] Fix the issue that task may consume input data after checkpoint barrier before checkpoint is performed for unaligned checkpoint
Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #12034:
URL: https://github.com/apache/flink/pull/12034#issuecomment-625870609
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## CI report:
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[GitHub] [flink] flinkbot edited a comment on pull request #12034: [FLINK-17568][checkpointing] Fix the issue that task may consume input data after checkpoint barrier before checkpoint is performed for unaligned checkpoint
Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #12034:
URL: https://github.com/apache/flink/pull/12034#issuecomment-625870609
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## CI report:
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[GitHub] [flink] flinkbot edited a comment on pull request #12034: [FLINK-17568][checkpointing] Fix the issue that task may consume input data after checkpoint barrier before checkpoint is performed for unaligned checkpoint
Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #12034:
URL: https://github.com/apache/flink/pull/12034#issuecomment-625870609
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[GitHub] [flink] flinkbot commented on pull request #12034: [FLINK-17568][checkpointing] Fix the issue that task may consume input data after checkpoint barrier before checkpoint is performed for unaligned checkpoint
Posted by GitBox <gi...@apache.org>.
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URL: https://github.com/apache/flink/pull/12034#issuecomment-625744490
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[GitHub] [flink] flinkbot edited a comment on pull request #12034: [FLINK-17568][checkpointing] Fix the issue that task may consume input data after checkpoint barrier before checkpoint is performed for unaligned checkpoint
Posted by GitBox <gi...@apache.org>.
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URL: https://github.com/apache/flink/pull/12034#issuecomment-625870609
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[GitHub] [flink] flinkbot commented on pull request #12034: [FLINK-17568][checkpointing] Fix the issue that task may consume input data after checkpoint barrier before checkpoint is performed for unaligned checkpoint
Posted by GitBox <gi...@apache.org>.
flinkbot commented on pull request #12034:
URL: https://github.com/apache/flink/pull/12034#issuecomment-625870609
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[GitHub] [flink] flinkbot edited a comment on pull request #12034: [FLINK-17568][checkpointing] Fix the issue that task may consume input data after checkpoint barrier before checkpoint is performed for unaligned checkpoint
Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #12034:
URL: https://github.com/apache/flink/pull/12034#issuecomment-625870609
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