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https://issues.apache.org/jira/browse/IMPALA-7234?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16565670#comment-16565670
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ASF subversion and git services commented on IMPALA-7234:
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Commit 672a271fd0966bd77f38eda9b6f1e768415bac04 in impala's branch
refs/heads/master from poojanilangekar
[ https://git-wip-us.apache.org/repos/asf?p=impala.git;h=672a271 ]
IMPALA-7234: Improve memory estimates produced by the Planner
Previously, the planner used the getMajorityFormat to estimate
the memory requirements of its partitions. Additionally, before
IMPALA-6625 was merged, the majority format for a multi-format
table with no numerical majority was calculated using a HashMap,
thus producing non deterministic results. This change ensures that
the memory estimate is deterministic and always based on partition
that has the maximum memory requirement.
Testing: Ran all PlannerTests. Also, modified plans of scans with
multiple partitions to ensure that the memory estimate produced
corresponds to the partition with the maximum requirement.
Change-Id: I0666ae3d45fbd8615d3fa9a8626ebd29cf94fb4b
Reviewed-on: http://gerrit.cloudera.org:8080/11001
Reviewed-by: Impala Public Jenkins <[email protected]>
Tested-by: Impala Public Jenkins <[email protected]>
> Non-deterministic majority format for a table with equal partition instances
> -----------------------------------------------------------------------------
>
> Key: IMPALA-7234
> URL: https://issues.apache.org/jira/browse/IMPALA-7234
> Project: IMPALA
> Issue Type: Bug
> Reporter: Pooja Nilangekar
> Assignee: Pooja Nilangekar
> Priority: Major
>
> The getMajorityFormat method of the FeCatalogUtils currently returns
> non-deterministic results when its argument is a list of partitions where
> there is no numerical majority in terms of the number of instances. The
> result is determined by the order in which the partitions are added to the
> HashMap. We need more deterministic results which also considers the memory
> requirement among different types of partitions. Ideally, this function
> should return the format with higher memory requirements in case of a tie.
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