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https://issues.apache.org/jira/browse/TEZ-4238?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17210284#comment-17210284
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László Bodor commented on TEZ-4238:
-----------------------------------
FYI: I pushed this to branch-0.10.0 in order to let HIVE-24207 depend on it
once 0.10.0 is released
> Check null mrReader in MRInput.close
> ------------------------------------
>
> Key: TEZ-4238
> URL: https://issues.apache.org/jira/browse/TEZ-4238
> Project: Apache Tez
> Issue Type: Improvement
> Reporter: László Bodor
> Assignee: László Bodor
> Priority: Major
> Fix For: 0.10.0, 0.9.3
>
> Attachments: TEZ-4238.01.patch, TEZ-4238.02.patch
>
>
> In HIVE-24207, an optimization is introduced on task side, where a task can
> exit quickly if it's needed according to an object cache value, which
> reflects the current records already pushed through the limit operator.
> The AM side optimization will more likely be TEZ-2103 for this scenario.
> Early exit can cause uninitialized inputs, that's what this patch is meant to
> solve.
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