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[GitHub] [spark] tdas opened a new pull request #29651: [SPARK-32794][SS] Fixed rare corner case error in micro-batch engine with some stateful queries + no-data-batches + V1 sources
tdas opened a new pull request #29651:
URL: https://github.com/apache/spark/pull/29651
### What changes were proposed in this pull request?
Make MicroBatchExecution explicitly call `getBatch` when the start and end offsets are the same.
### Why are the changes needed?
Structured Streaming micro-batch engine has the contract with V1 data sources that, after a restart, it will call `source.getBatch()` on the last batch attempted before the restart. However, a very rare combination of sequences violates this contract. It occurs only when
- The streaming query has specific types of stateful operations with watermarks (e.g., aggregation in append, mapGroupsWithState with timeouts).
- These queries can execute a batch even without new data when the previous updates the watermark and the stateful ops are such that the new watermark can cause new output/cleanup. Such batches are called no-data-batches.
- The last batch before termination was an incomplete no-data-batch. Upon restart, the micro-batch engine fails to call `source.getBatch` when attempting to re-execute the incomplete no-data-batch.
This occurs because no-data-batches has the same and end offsets, and when a batch is executed, if the start and end offset is same then calling `source.getBatch` is skipped as it is assumed the generated plan will be empty. This only affects V1 data sources like Delta and Autoloader which rely on this invariant to detect in the source whether the query is being started from scratch or restarted.
### Does this PR introduce _any_ user-facing change?
No
### How was this patch tested?
New unit test with a mock v1 source that fails without the fix.
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[GitHub] [spark] SparkQA commented on pull request #29651: [SPARK-32794][SS] Fixed rare corner case error in micro-batch engine with some stateful queries + no-data-batches + V1 sources
Posted by GitBox <gi...@apache.org>.
SparkQA commented on pull request #29651:
URL: https://github.com/apache/spark/pull/29651#issuecomment-687298679
**[Test build #128311 has finished](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/128311/testReport)** for PR 29651 at commit [`47a7396`](https://github.com/apache/spark/commit/47a7396a5ce483806d2402b77a9b51f8d1d8b393).
* This patch **fails to build**.
* This patch merges cleanly.
* This patch adds no public classes.
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[GitHub] [spark] HyukjinKwon commented on a change in pull request #29651: [SPARK-32794][SS] Fixed rare corner case error in micro-batch engine with some stateful queries + no-data-batches + V1 sources
Posted by GitBox <gi...@apache.org>.
HyukjinKwon commented on a change in pull request #29651:
URL: https://github.com/apache/spark/pull/29651#discussion_r484010520
##########
File path: sql/core/src/test/scala/org/apache/spark/sql/streaming/StreamTest.scala
##########
@@ -306,6 +306,14 @@ trait StreamTest extends QueryTest with SharedSparkSession with TimeLimits with
def apply(func: StreamExecution => Any): AssertOnQuery = apply("Execute")(func)
}
+ /** Call [[StreamingQuery.processAllAvailable()]] to wait. */
Review comment:
Ah, seems like here is the problem about Unidoc:
```
[error] /home/runner/work/spark/spark/sql/core/target/java/org/apache/spark/sql/streaming/StreamTest.java:358: error: unexpected text
[error] /** Call {@link StreamingQuery.processAllAvailable()} to wait. */
[error] ^
[error] /home/runner/work/spark/spark/sql/core/target/java/org/apache/spark/sql/streaming/StreamTest.java:362: error: unexpected text
[error] /** Call {@link StreamingQuery.processAllAvailable()} to wait. */
[error] ^
```
When Unidoc produces a Javadoc, it compiles Scala codes and extract Scala docs and converts them into Javadoc. The problem is that looks `trait` doesn't work well out of the box with it ..
Probably we could just change it to `` `StreamingQuery.processAllAvailable()` ``.
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[GitHub] [spark] tdas commented on a change in pull request #29651: [SPARK-32794][SS] Fixed rare corner case error in micro-batch engine with some stateful queries + no-data-batches + V1 sources
Posted by GitBox <gi...@apache.org>.
tdas commented on a change in pull request #29651:
URL: https://github.com/apache/spark/pull/29651#discussion_r485769555
##########
File path: sql/core/src/test/scala/org/apache/spark/sql/streaming/StreamTest.scala
##########
@@ -306,6 +306,14 @@ trait StreamTest extends QueryTest with SharedSparkSession with TimeLimits with
def apply(func: StreamExecution => Any): AssertOnQuery = apply("Execute")(func)
}
+ /** Call [[StreamingQuery.processAllAvailable()]] to wait. */
Review comment:
Thank you for pointing it out :)
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Posted by GitBox <gi...@apache.org>.
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Posted by GitBox <gi...@apache.org>.
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URL: https://github.com/apache/spark/pull/29651#issuecomment-687295847
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[GitHub] [spark] HyukjinKwon commented on a change in pull request #29651: [SPARK-32794][SS] Fixed rare corner case error in micro-batch engine with some stateful queries + no-data-batches + V1 sources
Posted by GitBox <gi...@apache.org>.
HyukjinKwon commented on a change in pull request #29651:
URL: https://github.com/apache/spark/pull/29651#discussion_r484011159
##########
File path: sql/core/src/test/scala/org/apache/spark/sql/streaming/StreamTest.scala
##########
@@ -306,6 +306,14 @@ trait StreamTest extends QueryTest with SharedSparkSession with TimeLimits with
def apply(func: StreamExecution => Any): AssertOnQuery = apply("Execute")(func)
}
+ /** Call [[StreamingQuery.processAllAvailable()]] to wait. */
Review comment:
Just FYI, the other errors are spurious. I tried to fix this problem so hard long ago but couldn't find a good way to fix, see also SPARK-20840
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[GitHub] [spark] HyukjinKwon commented on a change in pull request #29651: [SPARK-32794][SS] Fixed rare corner case error in micro-batch engine with some stateful queries + no-data-batches + V1 sources
Posted by GitBox <gi...@apache.org>.
HyukjinKwon commented on a change in pull request #29651:
URL: https://github.com/apache/spark/pull/29651#discussion_r484010520
##########
File path: sql/core/src/test/scala/org/apache/spark/sql/streaming/StreamTest.scala
##########
@@ -306,6 +306,14 @@ trait StreamTest extends QueryTest with SharedSparkSession with TimeLimits with
def apply(func: StreamExecution => Any): AssertOnQuery = apply("Execute")(func)
}
+ /** Call [[StreamingQuery.processAllAvailable()]] to wait. */
Review comment:
Ah, seems like here is the problem about Unidoc:
```
[error] /home/runner/work/spark/spark/sql/core/target/java/org/apache/spark/sql/streaming/StreamTest.java:358: error: unexpected text
[error] /** Call {@link StreamingQuery.processAllAvailable()} to wait. */
[error] ^
[error] /home/runner/work/spark/spark/sql/core/target/java/org/apache/spark/sql/streaming/StreamTest.java:362: error: unexpected text
[error] /** Call {@link StreamingQuery.processAllAvailable()} to wait. */
[error] ^
```
When Unidoc produces a Javadoc, it compiles Scala codes and extract Scala docs and converts them into Javadoc. The problem is that looks `trait` doesn't work well out of the box with it ..
Probably we could just change it to ``` ``StreamingQuery.processAllAvailable()`` ```.
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* This patch passes all tests.
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* This patch adds no public classes.
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URL: https://github.com/apache/spark/pull/29651#issuecomment-687443635
**[Test build #128312 has finished](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/128312/testReport)** for PR 29651 at commit [`873f73c`](https://github.com/apache/spark/commit/873f73cbac4c74bd6e4d5eea4b238f8dafb09f72).
* This patch passes all tests.
* This patch merges cleanly.
* This patch adds no public classes.
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[GitHub] [spark] AmplabJenkins removed a comment on pull request #29651: [SPARK-32794][SS] Fixed rare corner case error in micro-batch engine with some stateful queries + no-data-batches + V1 sources
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AmplabJenkins removed a comment on pull request #29651:
URL: https://github.com/apache/spark/pull/29651#issuecomment-687296459
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