[jira] [Commented] (SPARK-22956) Union Stream Failover Cause `IllegalStateException`

["Apache Spark (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-22956?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16311252#comment-16311252 ] 

Apache Spark commented on SPARK-22956:
--------------------------------------

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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