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https://issues.apache.org/jira/browse/IMPALA-9015?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tim Armstrong resolved IMPALA-9015.
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Fix Version/s: Impala 3.4.0
Resolution: Fixed
> Use better algorithm for allocating scan ranges to finstances within a daemon
> in schedule
> ------------------------------------------------------------------------------------------
>
> Key: IMPALA-9015
> URL: https://issues.apache.org/jira/browse/IMPALA-9015
> Project: IMPALA
> Issue Type: Sub-task
> Components: Distributed Exec
> Reporter: Tim Armstrong
> Assignee: Tim Armstrong
> Priority: Major
> Fix For: Impala 3.4.0
>
>
> Currently the scheduler uses a single-pass algorithm to allocate scan ranges
> to nodes. It has several deficiencies:
> * It doesn't guarantee that the desired number of instances are created. E.g.
> if mt_dop is 4, there are 3 impalads and 9 scan ranges, it should create 3
> instances per impala but doesn't reliably.
> * It tends to over-allocate to the first instances it visits.
> * The result depends quite a bit on the input order of the scan ranges.
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