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https://issues.apache.org/jira/browse/SPARK-22956?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16311252#comment-16311252
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Apache Spark commented on SPARK-22956:
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User 'xuanyuanking' has created a pull request for this issue:
https://github.com/apache/spark/pull/20150
> Union Stream Failover Cause `IllegalStateException`
> ---------------------------------------------------
>
> Key: SPARK-22956
> URL: https://issues.apache.org/jira/browse/SPARK-22956
> Project: Spark
> Issue Type: Bug
> Components: Structured Streaming
> Affects Versions: 2.1.0
> Reporter: Li Yuanjian
>
> When we union 2 streams from kafka or other sources, while one of them have
> no continues data coming and in the same time task restart, this will cause
> an `IllegalStateException`. This mainly cause because the code in
> [MicroBatchExecution|https://github.com/apache/spark/blob/master/sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/MicroBatchExecution.scala#L190]
> , while one stream has no continues data, its comittedOffset same with
> availableOffset during `populateStartOffsets`, and `currentPartitionOffsets`
> not properly handled in KafkaSource. Also, maybe we should also consider this
> scenario in other Source.
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