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https://issues.apache.org/jira/browse/HIVE-9339?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14273191#comment-14273191
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Rui Li commented on HIVE-9339:
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Using listener is fine. We currently use listeners to collect metrics as well.
> Optimize split grouping for CombineHiveInputFormat [Spark Branch]
> -----------------------------------------------------------------
>
> Key: HIVE-9339
> URL: https://issues.apache.org/jira/browse/HIVE-9339
> Project: Hive
> Issue Type: Sub-task
> Components: Spark
> Reporter: Xuefu Zhang
>
> It seems that split generation, especially in terms of grouping inputs, needs
> to be improved. For this, we may need cluster information. Because of this,
> we will first try to solve the problem for Spark.
> As to cluster information, Spark doesn't provide an API (SPARK-5080).
> However, Spark doesn't have a listener API, with which Spark driver can get
> notifications about executor going up/down, task starting/finishing, etc.
> With this information, Spark client should be able to have a view of the
> current cluster image.
> Spark developers mentioned that the listener can only be created after
> SparkContext is started, at which time, some executions may have already
> started and so the listener will miss some information. This can be fixed.
> File a JIRA with Spark project if necessary.
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