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https://issues.apache.org/jira/browse/HIVE-24415?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17260275#comment-17260275
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Mustafa İman commented on HIVE-24415:
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Merged to master. Thank you [~rameshkumar] for review.
> HiveSplitGenerator blocks Tez dispatcher
> ----------------------------------------
>
> Key: HIVE-24415
> URL: https://issues.apache.org/jira/browse/HIVE-24415
> Project: Hive
> Issue Type: Improvement
> Reporter: Mustafa İman
> Assignee: Mustafa İman
> Priority: Major
> Labels: pull-request-available
> Time Spent: 1h 10m
> Remaining Estimate: 0h
>
> HiveSplitGenerator does a lot of heavyweight operations in its constructor.
> These operations block AsyncDispatcher in Tez
> [https://github.com/apache/tez/blob/989d286d09cac7c4e4c5a0e06dd75ea5a6f15478/tez-dag/src/main/java/org/apache/tez/dag/app/dag/RootInputInitializerManager.java#L141]
> . We should move bulk of initialization out of constructor.
> The only reason of setting up everything in constructor is
> DynamicPartitionPruner. We can buffer incoming events in HiveSplitGenerator
> until dynamic partition pruner is initialized.
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