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Posted to issues@hive.apache.org by "Rui Li (JIRA)" <ji...@apache.org> on 2017/07/18 02:48:00 UTC
[jira] [Assigned] (HIVE-17114) HoS: Possible skew in shuffling when
data is not really skewed
[ https://issues.apache.org/jira/browse/HIVE-17114?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Rui Li reassigned HIVE-17114:
-----------------------------
> HoS: Possible skew in shuffling when data is not really skewed
> --------------------------------------------------------------
>
> Key: HIVE-17114
> URL: https://issues.apache.org/jira/browse/HIVE-17114
> Project: Hive
> Issue Type: Bug
> Reporter: Rui Li
> Assignee: Rui Li
> Priority: Minor
>
> Observed in HoS and may apply to other engines as well.
> When we join 2 tables on a single int key, we use the key itself as hash code in {{ObjectInspectorUtils.hashCode}}:
> {code}
> case INT:
> return ((IntObjectInspector) poi).get(o);
> {code}
> Suppose the keys are different but are all some multiples of 10. And if we choose 10 as #reducers, the shuffle will be skewed.
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