[jira] Updated: (HIVE-1801) HiveInputFormat or CombineHiveInputFormat always sync blocks of RCFile twice

["Siying Dong (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HIVE-1801?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Siying Dong updated HIVE-1801:
------------------------------

    Attachment: HIVE-1801.1.patch

Still running tests.

> HiveInputFormat or CombineHiveInputFormat always sync blocks of RCFile twice
> ----------------------------------------------------------------------------
>
>                 Key: HIVE-1801
>                 URL: https://issues.apache.org/jira/browse/HIVE-1801
>             Project: Hive
>          Issue Type: Improvement
>            Reporter: Siying Dong
>            Assignee: Siying Dong
>         Attachments: HIVE-1801.1.patch
>
>
> HiveInputFormat or CombineHiveInputFormat RCFile.Reader.sync() twice. One in getReader() and one in initIOContext(). We can avoid the latter one by read the sync() position of the former one.
> We also sync() twice for SequenceFile but since SequenceFileReader is not a part of Hive code, maybe we should be careful when depending on the implementation.

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