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Posted to issues@flink.apache.org by GitBox <gi...@apache.org> on 2020/10/08 15:12:15 UTC
[GitHub] [flink] XComp opened a new pull request #13564: [FLINK-17341][runtime] Fixed ConcurrentModificationException in TaskExecutor
XComp opened a new pull request #13564:
URL: https://github.com/apache/flink/pull/13564
## What is the purpose of the change
The fix is necessary since there is a possibility that a `ConcurrentModificationException` is thrown as described in FLINK-17341.
## Brief change log
The solution includes switching from `Iterator` to a `Set` of `AllocationID`s:
- Introduced `TaskSlotTable.getActiveTaskAllocationIdsPerJob(JobID)`
- Replaced usage of `TaskSlotTable.getActiveSlots(JobID)` by `TaskSlotTable.getActiveTaskAllocationIdsPerJob(JobID)`
- Removed `TaskSlotTable.getActiveSlots(JobID)` and `TaskSlotTable.AllocationIDIterator`
## Verifying this change
This change is already covered by existing tests, such as `TaskSlotTableImplTest.testTryMarkSlotActive`.
## Does this pull request potentially affect one of the following parts:
- Dependencies (does it add or upgrade a dependency): no
- The public API, i.e., is any changed class annotated with `@Public(Evolving)`: no
- The serializers: no
- The runtime per-record code paths (performance sensitive): no
- Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Kubernetes/Yarn/Mesos, ZooKeeper: no
- The S3 file system connector: no
## Documentation
- Does this pull request introduce a new feature? no
- If yes, how is the feature documented? not applicable
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[GitHub] [flink] flinkbot edited a comment on pull request #13564: [FLINK-17341][runtime] Fixed ConcurrentModificationException in TaskExecutor
Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #13564:
URL: https://github.com/apache/flink/pull/13564#issuecomment-705651851
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## CI report:
* 29eb9920d726629cb5d7c3b0a1093e46393b65eb Azure: [FAILURE](https://dev.azure.com/apache-flink/98463496-1af2-4620-8eab-a2ecc1a2e6fe/_build/results?buildId=7303)
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[GitHub] [flink] flinkbot commented on pull request #13564: [FLINK-17341][runtime] Fixed ConcurrentModificationException in TaskExecutor
Posted by GitBox <gi...@apache.org>.
flinkbot commented on pull request #13564:
URL: https://github.com/apache/flink/pull/13564#issuecomment-705638916
Thanks a lot for your contribution to the Apache Flink project. I'm the @flinkbot. I help the community
to review your pull request. We will use this comment to track the progress of the review.
## Automated Checks
Last check on commit c8deaa314d1ca5f93f66c45391a5ba0cb8d9fd22 (Thu Oct 08 15:14:53 UTC 2020)
**Warnings:**
* No documentation files were touched! Remember to keep the Flink docs up to date!
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## Review Progress
* ❓ 1. The [description] looks good.
* ❓ 2. There is [consensus] that the contribution should go into to Flink.
* ❓ 3. Needs [attention] from.
* ❓ 4. The change fits into the overall [architecture].
* ❓ 5. Overall code [quality] is good.
Please see the [Pull Request Review Guide](https://flink.apache.org/contributing/reviewing-prs.html) for a full explanation of the review process.<details>
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[GitHub] [flink] flinkbot commented on pull request #13564: [FLINK-17341][runtime] Fixed ConcurrentModificationException in TaskExecutor
Posted by GitBox <gi...@apache.org>.
flinkbot commented on pull request #13564:
URL: https://github.com/apache/flink/pull/13564#issuecomment-705638916
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[GitHub] [flink] XComp commented on a change in pull request #13564: [FLINK-17341][runtime] Fixed ConcurrentModificationException in TaskExecutor
Posted by GitBox <gi...@apache.org>.
XComp commented on a change in pull request #13564:
URL: https://github.com/apache/flink/pull/13564#discussion_r502515463
##########
File path: flink-runtime/src/main/java/org/apache/flink/runtime/taskexecutor/slot/TaskSlotTableImpl.java
##########
@@ -200,6 +200,17 @@ public boolean isClosed() {
}
}
+ @Override
+ public Set<AllocationID> getActiveTaskAllocationIdsPerJob(JobID jobId) {
+ Iterator<TaskSlot<T>> taskSlotIterator = new TaskSlotIterator(jobId, TaskSlotState.ACTIVE);
+ Set<AllocationID> allocationIds = new HashSet<>();
+ while (taskSlotIterator.hasNext()) {
+ allocationIds.add(taskSlotIterator.next().getAllocationId());
+ }
+
+ return allocationIds;
Review comment:
```suggestion
return Sets.newHashSet(new TaskSlotIterator(jobId, TaskSlotState.ACTIVE))
.stream()
.map(TaskSlot::getAllocationId)
.collect(Collectors.toSet());
```
The only other shorter way I can imagine is the one above. I just hesitated because it would mean iterating over the collection twice just to save a few lines.
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[GitHub] [flink] XComp commented on a change in pull request #13564: [FLINK-17341][runtime] Fixed ConcurrentModificationException in TaskExecutor
Posted by GitBox <gi...@apache.org>.
XComp commented on a change in pull request #13564:
URL: https://github.com/apache/flink/pull/13564#discussion_r502515463
##########
File path: flink-runtime/src/main/java/org/apache/flink/runtime/taskexecutor/slot/TaskSlotTableImpl.java
##########
@@ -200,6 +200,17 @@ public boolean isClosed() {
}
}
+ @Override
+ public Set<AllocationID> getActiveTaskAllocationIdsPerJob(JobID jobId) {
+ Iterator<TaskSlot<T>> taskSlotIterator = new TaskSlotIterator(jobId, TaskSlotState.ACTIVE);
+ Set<AllocationID> allocationIds = new HashSet<>();
+ while (taskSlotIterator.hasNext()) {
+ allocationIds.add(taskSlotIterator.next().getAllocationId());
+ }
+
+ return allocationIds;
Review comment:
```suggestion
return Sets.newHashSet(new TaskSlotIterator(jobId, TaskSlotState.ACTIVE))
.stream()
.map(TaskSlot::getAllocationId)
.collect(Collectors.toSet());
```
The only other "shorter" way I can imagine is the one above. I just hesitated because it would mean iterating over the collection twice just to save a few lines.
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[GitHub] [flink] flinkbot edited a comment on pull request #13564: [FLINK-17341][runtime] Fixed ConcurrentModificationException in TaskExecutor
Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #13564:
URL: https://github.com/apache/flink/pull/13564#issuecomment-705651851
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## CI report:
* 26b91f610ae3adfa35b1f6b9ac5d60d6ff598cfc UNKNOWN
* e50feab6bbfe6bd193c5830cbb31d9899df7f2af Azure: [SUCCESS](https://dev.azure.com/apache-flink/98463496-1af2-4620-8eab-a2ecc1a2e6fe/_build/results?buildId=7322)
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[GitHub] [flink] tillrohrmann commented on a change in pull request #13564: [FLINK-17341][runtime] Fixed ConcurrentModificationException in TaskExecutor
Posted by GitBox <gi...@apache.org>.
tillrohrmann commented on a change in pull request #13564:
URL: https://github.com/apache/flink/pull/13564#discussion_r502462462
##########
File path: flink-runtime/src/main/java/org/apache/flink/runtime/taskexecutor/slot/TaskSlotTableImpl.java
##########
@@ -200,6 +200,17 @@ public boolean isClosed() {
}
}
+ @Override
+ public Set<AllocationID> getActiveTaskAllocationIdsPerJob(JobID jobId) {
+ Iterator<TaskSlot<T>> taskSlotIterator = new TaskSlotIterator(jobId, TaskSlotState.ACTIVE);
+ Set<AllocationID> allocationIds = new HashSet<>();
+ while (taskSlotIterator.hasNext()) {
+ allocationIds.add(taskSlotIterator.next().getAllocationId());
+ }
+
+ return allocationIds;
Review comment:
```suggestion
return Sets.newHashSet(new TaskSlotIterator(jobId, TaskSlotState.ACTIVE);
```
might be a bit shorter.
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[GitHub] [flink] tillrohrmann closed pull request #13564: [FLINK-17341][runtime] Fixed ConcurrentModificationException in TaskExecutor
Posted by GitBox <gi...@apache.org>.
tillrohrmann closed pull request #13564:
URL: https://github.com/apache/flink/pull/13564
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[GitHub] [flink] XComp commented on a change in pull request #13564: [FLINK-17341][runtime] Fixed ConcurrentModificationException in TaskExecutor
Posted by GitBox <gi...@apache.org>.
XComp commented on a change in pull request #13564:
URL: https://github.com/apache/flink/pull/13564#discussion_r502515463
##########
File path: flink-runtime/src/main/java/org/apache/flink/runtime/taskexecutor/slot/TaskSlotTableImpl.java
##########
@@ -200,6 +200,17 @@ public boolean isClosed() {
}
}
+ @Override
+ public Set<AllocationID> getActiveTaskAllocationIdsPerJob(JobID jobId) {
+ Iterator<TaskSlot<T>> taskSlotIterator = new TaskSlotIterator(jobId, TaskSlotState.ACTIVE);
+ Set<AllocationID> allocationIds = new HashSet<>();
+ while (taskSlotIterator.hasNext()) {
+ allocationIds.add(taskSlotIterator.next().getAllocationId());
+ }
+
+ return allocationIds;
Review comment:
```suggestion
return Sets.newHashSet(new TaskSlotIterator(jobId, TaskSlotState.ACTIVE))
.stream()
.map(TaskSlot::getAllocationId)
.collect(Collectors.toSet());
```
The only other shorter way I can imagine is the one above. I just hesitated because it would mean iterating over the collection twice just to save a few lines.
```suggestion
return StreamSupport.stream(Spliterators.spliteratorUnknownSize(new TaskSlotIterator(jobId, TaskSlotState.ACTIVE), Spliterator.ORDERED), false)
.map(TaskSlot::getAllocationId)
.collect(Collectors.toSet());
```
Creating a stream right out of the Iterator does not make the code more readable either, IMHO.
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[GitHub] [flink] flinkbot edited a comment on pull request #13564: [FLINK-17341][runtime] Fixed ConcurrentModificationException in TaskExecutor
Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #13564:
URL: https://github.com/apache/flink/pull/13564#issuecomment-705651851
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* 26b91f610ae3adfa35b1f6b9ac5d60d6ff598cfc UNKNOWN
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[GitHub] [flink] flinkbot edited a comment on pull request #13564: [FLINK-17341][runtime] Fixed ConcurrentModificationException in TaskExecutor
Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #13564:
URL: https://github.com/apache/flink/pull/13564#issuecomment-705651851
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[GitHub] [flink] flinkbot edited a comment on pull request #13564: [FLINK-17341][runtime] Fixed ConcurrentModificationException in TaskExecutor
Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #13564:
URL: https://github.com/apache/flink/pull/13564#issuecomment-705651851
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[GitHub] [flink] flinkbot commented on pull request #13564: [FLINK-17341][runtime] Fixed ConcurrentModificationException in TaskExecutor
Posted by GitBox <gi...@apache.org>.
flinkbot commented on pull request #13564:
URL: https://github.com/apache/flink/pull/13564#issuecomment-705651851
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[GitHub] [flink] tillrohrmann commented on a change in pull request #13564: [FLINK-17341][runtime] Fixed ConcurrentModificationException in TaskExecutor
Posted by GitBox <gi...@apache.org>.
tillrohrmann commented on a change in pull request #13564:
URL: https://github.com/apache/flink/pull/13564#discussion_r502519775
##########
File path: flink-runtime/src/main/java/org/apache/flink/runtime/taskexecutor/slot/TaskSlotTableImpl.java
##########
@@ -200,6 +200,17 @@ public boolean isClosed() {
}
}
+ @Override
+ public Set<AllocationID> getActiveTaskAllocationIdsPerJob(JobID jobId) {
+ Iterator<TaskSlot<T>> taskSlotIterator = new TaskSlotIterator(jobId, TaskSlotState.ACTIVE);
+ Set<AllocationID> allocationIds = new HashSet<>();
+ while (taskSlotIterator.hasNext()) {
+ allocationIds.add(taskSlotIterator.next().getAllocationId());
+ }
+
+ return allocationIds;
Review comment:
Yes, you are completely right. Forget about my comment. I overlooked that we are only interested in the `AllocationIDs`.
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[GitHub] [flink] flinkbot edited a comment on pull request #13564: [FLINK-17341][runtime] Fixed ConcurrentModificationException in TaskExecutor
Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #13564:
URL: https://github.com/apache/flink/pull/13564#issuecomment-705651851
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[GitHub] [flink] flinkbot edited a comment on pull request #13564: [FLINK-17341][runtime] Fixed ConcurrentModificationException in TaskExecutor
Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #13564:
URL: https://github.com/apache/flink/pull/13564#issuecomment-705651851
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## CI report:
* 29eb9920d726629cb5d7c3b0a1093e46393b65eb Azure: [PENDING](https://dev.azure.com/apache-flink/98463496-1af2-4620-8eab-a2ecc1a2e6fe/_build/results?buildId=7303)
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