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Posted to issues@flink.apache.org by GitBox <gi...@apache.org> on 2020/10/23 12:39:37 UTC
[GitHub] [flink] tzulitai opened a new pull request #13772: [FLINK-19748] Iterating key groups in raw keyed stream on restore fails if some key groups weren't written
tzulitai opened a new pull request #13772:
URL: https://github.com/apache/flink/pull/13772
This PR is based on top of #13761, since a new test was added in #13761 that would also cover the fix in this PR.
Only the last 2 commits are relevant.
## What is the purpose of the change
When iterating through key groups in restored raw keyed state streams, the iterator (`StreamTaskStateInitializerImpl#KeyGroupStreamIterator`) doesn't respect that fact that some key groups were skipped and were not written, .e.g:
```
// on snapshots
KeyedStateCheckpointOutputStream rawKeyedStream = snapshotContext.getRawKeyedOperatorStateOutput();
rawKeyedStream.startNewKeyGroup(0);
rawKeyedStream.startNewKeyGroup(3); // skipped key groups 1 and 2
```
In this case, the offsets for key groups 1 and 2 written in the checkpoint metadata will be `-1` (meaning, an undefined offset).
On restore, however, the iterator still attempts to seek the restored keyed state streams with the offsets, ultimately failing with a position out of bounds when it attempts to seek to position `-1`.
The usage behaviour of skipping key groups when writing to the raw keyed state stream is currently completely valid as the `KeyedStateCheckpointOutputStream` API does not forbid it. StateFun, for example, did exactly that.
## Solution
This PR solves the issue by modifying `StreamTaskStateInitializerImpl#KeyGroupStreamIterator` to skip key groups with undefined offsets (i.e. `-1`).
The changes are isolated such that is should only affect the restore of raw keyed state streams, and does not affect the restore of state backends.
## Brief change log
- a130d84 Wraps the original key group offsets iterator to filter out key groups with undefined offsets.
- c6bae68 Adjusts the existing `AbstractStreamOperatorTest.testCustomRawKeyedStateSnapshotAndRestore` test to only write some key groups, and not all of them.
## Verifying this change
- The new `AbstractStreamOperatorTest.testCustomRawKeyedStateSnapshotAndRestore` test should pass.
- There are existing integration tests that test snapshotting and restoring of heap-based timers, which should cover the current usage of the raw keyed state stream in Flink.
## 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 commented on pull request #13772: [FLINK-19748] Iterating key groups in raw keyed stream on restore fails if some key groups weren't written
Posted by GitBox <gi...@apache.org>.
flinkbot commented on pull request #13772:
URL: https://github.com/apache/flink/pull/13772#issuecomment-715366899
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## CI report:
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[GitHub] [flink] flinkbot edited a comment on pull request #13772: [FLINK-19748] Iterating key groups in raw keyed stream on restore fails if some key groups weren't written
Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #13772:
URL: https://github.com/apache/flink/pull/13772#issuecomment-715366899
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## CI report:
* 3abd2ed382cbb3d875ed0ad4754bf34b26da78fc Azure: [FAILURE](https://dev.azure.com/apache-flink/98463496-1af2-4620-8eab-a2ecc1a2e6fe/_build/results?buildId=8305) Azure: [FAILURE](https://dev.azure.com/apache-flink/98463496-1af2-4620-8eab-a2ecc1a2e6fe/_build/results?buildId=8340) Azure: [FAILURE](https://dev.azure.com/apache-flink/98463496-1af2-4620-8eab-a2ecc1a2e6fe/_build/results?buildId=8370)
* 54e4d5df7d226656c6a1ee771e53516b262e42c0 Azure: [PENDING](https://dev.azure.com/apache-flink/98463496-1af2-4620-8eab-a2ecc1a2e6fe/_build/results?buildId=8394)
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[GitHub] [flink] flinkbot edited a comment on pull request #13772: [FLINK-19748] Iterating key groups in raw keyed stream on restore fails if some key groups weren't written
Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #13772:
URL: https://github.com/apache/flink/pull/13772#issuecomment-715366899
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## CI report:
* 3abd2ed382cbb3d875ed0ad4754bf34b26da78fc Azure: [FAILURE](https://dev.azure.com/apache-flink/98463496-1af2-4620-8eab-a2ecc1a2e6fe/_build/results?buildId=8305) Azure: [FAILURE](https://dev.azure.com/apache-flink/98463496-1af2-4620-8eab-a2ecc1a2e6fe/_build/results?buildId=8340) Azure: [PENDING](https://dev.azure.com/apache-flink/98463496-1af2-4620-8eab-a2ecc1a2e6fe/_build/results?buildId=8370)
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[GitHub] [flink] flinkbot edited a comment on pull request #13772: [FLINK-19748] Iterating key groups in raw keyed stream on restore fails if some key groups weren't written
Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #13772:
URL: https://github.com/apache/flink/pull/13772#issuecomment-715366899
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## CI report:
* 3abd2ed382cbb3d875ed0ad4754bf34b26da78fc Azure: [FAILURE](https://dev.azure.com/apache-flink/98463496-1af2-4620-8eab-a2ecc1a2e6fe/_build/results?buildId=8305) Azure: [FAILURE](https://dev.azure.com/apache-flink/98463496-1af2-4620-8eab-a2ecc1a2e6fe/_build/results?buildId=8340) Azure: [FAILURE](https://dev.azure.com/apache-flink/98463496-1af2-4620-8eab-a2ecc1a2e6fe/_build/results?buildId=8370)
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[GitHub] [flink] flinkbot commented on pull request #13772: [FLINK-19748] Iterating key groups in raw keyed stream on restore fails if some key groups weren't written
Posted by GitBox <gi...@apache.org>.
flinkbot commented on pull request #13772:
URL: https://github.com/apache/flink/pull/13772#issuecomment-715317567
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## Automated Checks
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[GitHub] [flink] flinkbot edited a comment on pull request #13772: [FLINK-19748] Iterating key groups in raw keyed stream on restore fails if some key groups weren't written
Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #13772:
URL: https://github.com/apache/flink/pull/13772#issuecomment-715366899
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## CI report:
* c6bae683ccd3cc80b9957f3316ca234acf0fbbab Azure: [FAILURE](https://dev.azure.com/apache-flink/98463496-1af2-4620-8eab-a2ecc1a2e6fe/_build/results?buildId=8200)
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[GitHub] [flink] carp84 commented on a change in pull request #13772: [FLINK-19748] Iterating key groups in raw keyed stream on restore fails if some key groups weren't written
Posted by GitBox <gi...@apache.org>.
carp84 commented on a change in pull request #13772:
URL: https://github.com/apache/flink/pull/13772#discussion_r511606110
##########
File path: flink-streaming-java/src/test/java/org/apache/flink/streaming/api/operators/AbstractStreamOperatorTest.java
##########
@@ -444,10 +445,11 @@ public void testCustomRawKeyedStateSnapshotAndRestore() throws Exception {
final int maxParallelism = 10;
final int numSubtasks = 1;
final int subtaskIndex = 0;
- final KeyGroupRange keyGroupRange = KeyGroupRange.of(0, maxParallelism - 1);
+ final List<Integer> keyGroupsToWrite = Arrays.asList(2, 3, 8);
Review comment:
Maybe we could extract the common logic out as a utility test method and add another test case in name of like `testCustomRawKeyedStateSnapshotAndRestoreWithPartialWrittenKeyGroups`?
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[GitHub] [flink] tzulitai commented on pull request #13772: [FLINK-19748] Iterating key groups in raw keyed stream on restore fails if some key groups weren't written
Posted by GitBox <gi...@apache.org>.
tzulitai commented on pull request #13772:
URL: https://github.com/apache/flink/pull/13772#issuecomment-716521418
Thanks for the review @carp84!
I've addressed your comments, and will rebase this after #13761 is merged.
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[GitHub] [flink] tzulitai closed pull request #13772: [FLINK-19748] Iterating key groups in raw keyed stream on restore fails if some key groups weren't written
Posted by GitBox <gi...@apache.org>.
tzulitai closed pull request #13772:
URL: https://github.com/apache/flink/pull/13772
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[GitHub] [flink] tzulitai commented on pull request #13772: [FLINK-19748] Iterating key groups in raw keyed stream on restore fails if some key groups weren't written
Posted by GitBox <gi...@apache.org>.
tzulitai commented on pull request #13772:
URL: https://github.com/apache/flink/pull/13772#issuecomment-716939458
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[GitHub] [flink] flinkbot edited a comment on pull request #13772: [FLINK-19748] Iterating key groups in raw keyed stream on restore fails if some key groups weren't written
Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #13772:
URL: https://github.com/apache/flink/pull/13772#issuecomment-715366899
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## CI report:
* 3abd2ed382cbb3d875ed0ad4754bf34b26da78fc Azure: [FAILURE](https://dev.azure.com/apache-flink/98463496-1af2-4620-8eab-a2ecc1a2e6fe/_build/results?buildId=8305)
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[GitHub] [flink] flinkbot edited a comment on pull request #13772: [FLINK-19748] Iterating key groups in raw keyed stream on restore fails if some key groups weren't written
Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #13772:
URL: https://github.com/apache/flink/pull/13772#issuecomment-715366899
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[GitHub] [flink] flinkbot edited a comment on pull request #13772: [FLINK-19748] Iterating key groups in raw keyed stream on restore fails if some key groups weren't written
Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #13772:
URL: https://github.com/apache/flink/pull/13772#issuecomment-715366899
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[GitHub] [flink] flinkbot edited a comment on pull request #13772: [FLINK-19748] Iterating key groups in raw keyed stream on restore fails if some key groups weren't written
Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #13772:
URL: https://github.com/apache/flink/pull/13772#issuecomment-715366899
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[GitHub] [flink] tzulitai commented on pull request #13772: [FLINK-19748] Iterating key groups in raw keyed stream on restore fails if some key groups weren't written
Posted by GitBox <gi...@apache.org>.
tzulitai commented on pull request #13772:
URL: https://github.com/apache/flink/pull/13772#issuecomment-717052358
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