kennknowles commented on issue #20655:
URL: https://github.com/apache/beam/issues/20655#issuecomment-1287458787
A few more causes and digging in to the log we get
```
Caused by: java.io.IOException: Cannot write record to fresh sort buffer.
Record too large.
at
org.apache.flink.runtime.operators.chaining.SynchronousChainedCombineDriver.collect(SynchronousChainedCombineDriver.java:190)
at
org.apache.flink.runtime.operators.util.metrics.CountingCollector.collect(CountingCollector.java:35)
at
org.apache.flink.runtime.operators.chaining.ChainedMapDriver.collect(ChainedMapDriver.java:78)
at
org.apache.flink.runtime.operators.util.metrics.CountingCollector.collect(CountingCollector.java:35)
at
org.apache.beam.runners.flink.translation.functions.FlinkExecutableStagePruningFunction.flatMap(FlinkExecutableStagePruningFunction.java:58)
at
org.apache.beam.runners.flink.translation.functions.FlinkExecutableStagePruningFunction.flatMap(FlinkExecutableStagePruningFunction.java:30)
at
org.apache.flink.runtime.operators.chaining.ChainedFlatMapDriver.collect(ChainedFlatMapDriver.java:79)
```
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