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Posted to issues@hive.apache.org by "Gopal V (JIRA)" <ji...@apache.org> on 2015/04/07 18:44:12 UTC
[jira] [Updated] (HIVE-10191) ORC: Cleanup writer per-row
synchronization
[ https://issues.apache.org/jira/browse/HIVE-10191?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Gopal V updated HIVE-10191:
---------------------------
Attachment: HIVE-10191.1.patch
> ORC: Cleanup writer per-row synchronization
> -------------------------------------------
>
> Key: HIVE-10191
> URL: https://issues.apache.org/jira/browse/HIVE-10191
> Project: Hive
> Issue Type: Bug
> Components: File Formats
> Affects Versions: 1.2.0
> Reporter: Gopal V
> Assignee: Gopal V
> Attachments: HIVE-10191.1.patch
>
>
> ORC writers were originally meant to be thread-safe, but in the present day implementation each ORC writer is entirely share-nothing which converts most of the synchronized blocks in ORC as entirely uncontested locks.
> These uncontested locks prevent the JVM from inlining/optimizing these methods, while adding no extra thread-safety to the ORC writers.
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