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Posted to issues@hive.apache.org by "Prasanth Jayachandran (JIRA)" <ji...@apache.org> on 2017/09/01 01:57:00 UTC
[jira] [Updated] (HIVE-17417) LazySimple Timestamp and Date
serialization is very expensive
[ https://issues.apache.org/jira/browse/HIVE-17417?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Prasanth Jayachandran updated HIVE-17417:
-----------------------------------------
Attachment: HIVE-17417.1.patch
Only fixed timestamp in this patch.
> LazySimple Timestamp and Date serialization is very expensive
> -------------------------------------------------------------
>
> Key: HIVE-17417
> URL: https://issues.apache.org/jira/browse/HIVE-17417
> Project: Hive
> Issue Type: Bug
> Components: Serializers/Deserializers
> Affects Versions: 3.0.0, 2.4.0
> Reporter: Prasanth Jayachandran
> Assignee: Prasanth Jayachandran
> Priority: Critical
> Attachments: date-serialize.png, HIVE-17417.1.patch, timestamp-serialize.png
>
>
> In a specific case where a schema contains array<struct> with timestamp and date fields (array size >10000). Any access to this column very very expensive in terms of CPU as most of the time is serialization of timestamp and date. Refer attached profiles. >70% time spent in serialization + tostring conversions.
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