[jira] [Updated] (TEZ-3769) Unordered: Fix wrong stats being sent out in the last event, when final merge is disabled

["Rajesh Balamohan (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/TEZ-3769?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Rajesh Balamohan updated TEZ-3769:
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    Summary: Unordered: Fix wrong stats being sent out in the last event, when final merge is disabled  (was: Unordered: Fix wrong stats being sent out in the last event when final merge is disabled)

> Unordered: Fix wrong stats being sent out in the last event, when final merge is disabled
> -----------------------------------------------------------------------------------------
>
>                 Key: TEZ-3769
>                 URL: https://issues.apache.org/jira/browse/TEZ-3769
>             Project: Apache Tez
>          Issue Type: Bug
>            Reporter: Rajesh Balamohan
>
> When final merge is disabled (without pipelining), wrong stats was sent out in the last event. 
> It was based on {{numRecordsPerPartition}} which contains the overall partition data. It should be ideally be based on the spill result and its buffers.
> Also, {{finalSpill}} was unncessarily sending events when no data was present (i.e, when currentBuffer didn't have any data).  This can be optimized to reduce the number of events being sent across.



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